Boss Catalog

Boss Catalog: IridescentCraft

This page lists every boss in the pack by tier, where to find it, and how hard it is to find without an external wiki. It began in May 2026 as the scoping study for the Boss Compass and its auto-waystones. The compass, the bonfires and the boss rush have since been built on the pack's boss registry, the one list every system reads for a boss's tier, kind and boss-rush roster.

As of 2026-10-16 every row agrees with the boss registry (tier, kind, boss rush, Boss Compass row) and names only entity types and structures the game has; the rows removed that day are listed after each tier's table. Every boss sits in the table of its registry tier, with three exceptions named in their rows: Lucifer and the Ignited Revenant (tier-4 bosses on the Tier 3 boss rush) are listed under T3, and the Ultimate Wither (the Wither's level 3, built with a Tier 4 block) under T4. Bosses off the boss list sit in the table of the place they are met.

Column definitions:

• Tier: the boss's tier in the boss registry, which is also the tier of the kill tokens it pays. A plain tier is a named boss (a first-kill bonus, then repeat tokens). "miniboss" pays tokens on every kill. "no tokens" is a boss for every boss rule (no beheading, the boss health and damage rules) that pays no kill tokens. "rush" means it counts toward its tier's boss rush ("rush T3" when the roster is not the boss's own tier). "off list" means it is not on the pack's boss list: the mod's own encounter, with no kill tokens and no boss-rush credit; the tier of the place it is met follows in brackets.
• Spawn Mechanism: structure-locked (the boss is part of a structure), biome-conditional-random (natural spawn in matching biomes), summoned-by-item (a crafted or dropped item calls it), summoned-by-altar (an altar or ritual calls it), dimensional-arrival (it waits at the dimension's entry), scripted (a mod event or a trigger the player sets off).
• Spawn Location: structure and dimension, or biomes and dimension. "Boss Compass" means the boss has a row on the Boss Compass (and a bonfire waystone at its arena).
• Notable Drops: the items players want most, including the pack's own drop rules (master-appendix.md §C).
• Discovery Pain: a score from 1 to 5 for how hard the boss is to find in game without an external wiki.
  • 1: Trivial. Explorer's Compass lists the structure and works on the first try.
  • 2: Easy. The structure has a worldgen advancement or another clear signal once you are in the right biome.
  • 3: Moderate. The boss exists, but the player won't know where to look without the quest book or the Codex first.
  • 4: Hard. A random biome spawn with no compass support, or a multi-step summon the Codex doesn't fully explain.
  • 5: Nearly impossible. Nothing in game leads the player to it.

Bosses scoring 4 or 5 are the compass system's priority list. Bosses scoring 1 or 2 are bonus coverage, since Explorer's Compass already partly solves them.

Mods checked that have no progression bosses: forbidden_arcanus (its Lost Soul is an ambient mob, not boss-tier), mahoutsukai (only Fae, Familiar, Kodoku and Butterfly summons, none with a boss bar), art_of_forging (a Tetra weapon framework with no entities), cataclysm_ut (a utility addon only), multiplayerbosses (it strengthens the vanilla Dragon, Wither and Warden and adds no entities), bossultimatum (a death-ultimatum mechanic only).

Mods named in older design notes but not in the pack: Alex's Caves (alexscaves:luxtructosaurus), Friends and Foes (friendsandfoes:wildfire), Illage and Spillage, Adventurez, Goety, Knightquest, Marium's Soulslike Weaponry, Aquamirae, Legendary Monsters, the Wetlands, Galosphere, Frostiful, Bosses of Mass Destruction, Born in Chaos, Mythic Mobs/Legends, MutantMore, LuMoreBossesAndMobs. (Mowzie's Mobs is in the pack, with five rows below. So is The Abyss (TATOS): its Elder, The Roka, Nightblade, Ice Knight and Soul Guard are on the boss list (Tier 3, no tokens), and its Guard is a plain mob. "Nosaj" exists in The Abyss only as items (amuled_of_nosaj, crown_of_nosaj, nosaj_sword); there is no theabyss:nosaj boss entity.)

Two mods make their bosses out of vanilla mobs. Brutal Bosses and Ultris: Boss Expansion add no entity types: a Brutal Bosses champion is a vanilla mob given a name, stats and abilities, and an Ultris boss is a vanilla mob run by the mod's functions. The boss rush credits a kill by entity type, so neither mod's bosses can count toward it, and none of them is on the boss list.

---

T1: Overworld (entry tier)

History (decisions of 2026-05-30, still in force): the Overworld is Tier 1 (tiers follow location). LuMoreBossesAndMobs was listed but not installed, and was dropped. Terramity was re-tiered: Gob stayed at T1 with a re-priced summon (an emerald path to the gnome hat besides the mod's diamond barter), Virtue moved to the Aether (now Tier 4), and super_sniffer stayed T1. Merlin, Circe and Gundalf turned out to live in the Nether's Chthonic Cathedral, and have been Tier 3 since 2026-10-16 (table below).

Mod	Entity ID	Display Name	Tier	Spawn Mechanism	Spawn Location	Notable Drops	Discovery Pain
Terramity	terramity:gob	Gob, King of Gnomes	T1 · rush	structure-locked + summoned-by-item	terramity:court_of_gnomes in swamp / dark forest / #forge:is_swamp; use a gnome hat on the golden gnome statue (a gnome trades the hat for a diamond, or you craft it with emeralds). Boss Compass	gobs_claymore, gobs_gilded_hat, belt_of_the_gnome_king	3
Terramity	terramity:super_sniffer	Super Sniffer	T1 · rush	structure-locked	terramity:ancient_outcrop in desert / hot biomes. Boss Compass	super_sniffers_pelt, giant_sniffers_hoof	3
Mutant Monsters	mutantmonsters:mutant_zombie	Mutant Zombie	T1 · miniboss · rush	scripted (lightning + skull spirit)	Overworld surface, summoned by a Skull Spirit on a zombie corpse	mutant zombie hulk hammer	4
Mutant Monsters	mutantmonsters:mutant_skeleton	Mutant Skeleton	T1 · miniboss · rush	scripted (Skull Spirit on skeleton bones)	Overworld surface	mutant skeleton skull/pelvis/limb/rib/shoulder pad	4
Mutant Monsters	mutantmonsters:mutant_creeper	Mutant Creeper	T1 · miniboss · rush	biome-conditional-random	Overworld surface (low spawn)	gunpowder, creeper minion egg	4
Mowzie's Mobs	mowziesmobs:ferrous_wroughtnaut	Ferrous Wroughtnaut	T1 · rush	structure-locked	mowziesmobs:wrought_chamber, underground in the Overworld (all has_mowzie_structure biomes)	wrought_axe (Axe of a Thousand Metals), wrought_helmet, Ironheart Cog (relic, 40 %)	2
Mowzie's Mobs	mowziesmobs:umvuthi	Umvuthi, the Sunbird	T1 · rush	structure-locked	mowziesmobs:umvuthana_grove in minecraft:is_savanna biomes of the Overworld	sol_visage mask, sun's blessing, solar beam mats	2
Mowzie's Mobs	mowziesmobs:sculptor	Tongbi, the Sculptor	T1 · rush	structure-locked + trade-challenge	mowziesmobs:monastery in #forge:is_peak biomes of the Overworld	sculptor_staff (geomancy), earthrend gauntlet mats	3
Mowzie's Mobs	mowziesmobs:naga	Naga	T1 · miniboss · rush	biome-conditional-random	minecraft:is_beach / minecraft:is_mountain+is_hill biomes of the Overworld	naga_fang (for the naga_fang_dagger), naga scales	4
Vanilla	minecraft:elder_guardian	Elder Guardian	T1 · no tokens	structure-locked	Ocean monuments	wet sponge, prismarine, fish	1
Minecraft Comes Alive	mca:grim_reaper	Grim Reaper	T1 · miniboss	summoned-by-altar	anywhere in the Overworld at night: three obsidian pillars lit with fire (the mod's summoning altar)	the reaper's scythe	4
Terramity	terramity:dungeon_effigy	Dungeon Effigy	off list (T1 area)	structure-locked	terramity:trial_spire (Overworld ocean biomes), with the Dungeon Sentries	the mod's own drops	3
Brutal Bosses	vanilla mobs (29 champions: zombie, skeleton, husk, stray, drowned, witch, cave spider, iron golem, evoker, vindicator, pillager, blaze, wither skeleton, piglin brute, shulker, ...)	named champions (e.g. Corvin the Rotten, Kip the Swift)	off list (where met)	structure-locked	a champion can appear beside a structure's treasure chest when it is first opened (30 % per chest, at least 400 blocks from the last one); Overworld, Nether and End structures	the chest's loot, the champion's own drops	2
Ultris	minecraft:enderman (Ultris)	Corrupted Enderman	off list (T1 area)	scripted	a rare random event near a player in the Overworld	the Ominous Pearl (Ultris's Ultra Wither summon, which cannot work in this pack: see the Tier 3 table), the mod's own drops	4
Ultris	minecraft:zombie (Ultris)	Giant	off list (T1 area)	scripted	throw a Potion of Strength at a zombie near you (Overworld)	Giant Stompers	4
Ultris	minecraft:illusioner (Ultris)	Illusioner	off list (T1 area)	scripted	a rare random event near a player in the Overworld	the mod's own drops	4
Ultris	minecraft:stray (Ultris)	Sanctum Keeper	off list (T1 area)	structure-locked	Ultris's Sanctum (1_splatus:sanctum), underground in Overworld stronghold biomes	the Spirit Bow	3

T1 subtotal: 17 rows. 11 are on the boss list: 9 on the Tier 1 boss rush (Gob, Super Sniffer, the three Mutant Monsters, Mowzie's Wroughtnaut, Umvuthi, Sculptor and Naga), MCA's Grim Reaper (a miniboss on no roster) and the Elder Guardian (no tokens). The other rows are Terramity's Dungeon Effigy, the Brutal Bosses champions (one row) and 4 Ultris bosses.

Removed from Tier 1 on 2026-10-16: the four Marium's Soulslike Weaponry bosses (Draugr, Returning Knight, Night Shade, Moonknight; the mod is not in the pack), the 14 separate Brutal Bosses rows (their ids were the mod's config names, not entity types, and every champion appears at a structure chest; they are now one row), the legacy Old Netherite Monstrosity[^t1cata] (not an entity of the installed Cataclysm), and the Terramity rows of other tiers (moved to their tables).

---

T2: First-dimensional (Twilight / Blue Skies)

Mod	Entity ID	Display Name	Tier	Spawn Mechanism	Spawn Location	Notable Drops	Discovery Pain
Twilight Forest	twilightforest:naga	Naga	T2 · rush	structure-locked	naga_courtyard, Twilight Forest dimension. Boss Compass	naga_scale, naga_trophy, simplyswords:tempest @ 15%	1
Twilight Forest	twilightforest:lich	Lich	T2 · rush	structure-locked	lich_tower, Twilight Forest. Boss Compass	lich_trophy, fortification/lifedrain/twilight/zombie scepters @ 25%, Phylactery Shard (relic, 40 %), simplyswords:soulrender @ 15%	1
Twilight Forest	twilightforest:hydra	Hydra	T2 · rush	structure-locked	hydra_lair, Twilight Forest swamp biome. Boss Compass	hydra_fang, waystone_core, simplyswords:emberblade @ 15%	1
Twilight Forest	twilightforest:ur_ghast	Ur-Ghast	T2 · rush	structure-locked	dark_tower, Twilight Forest dark forest. Boss Compass	ur_ghast_tear, simplyswords:whisperwind @ 20%	1
Twilight Forest	twilightforest:knight_phantom	Knight Phantom	T2 · rush	structure-locked	knight_stronghold, Twilight Forest. Boss Compass	simplyswords:enigma @ 12%	1
Twilight Forest	twilightforest:snow_queen	Snow Queen	T2 · rush	structure-locked	aurora_palace, Twilight Forest snow biome. Boss Compass	ice_staff @ 50%, simplyswords:frostfall @ 15%	1
Twilight Forest	twilightforest:minoshroom	Minoshroom	T2 · rush	structure-locked	labyrinth, Twilight Forest swamp. Boss Compass	diamond_minotaur_axe, meef_stroganoff, minoshroom_trophy, simplyswords:mjolnir @ 15% (since 2026-10-16)	1
Twilight Forest	twilightforest:alpha_yeti	Alpha Yeti	T2 · rush	structure-locked	yeti_cave, Twilight Forest snow biome. Boss Compass	ice_staff @ 25%, simplyswords:icewhisper @ 10%	1
Twilight Forest	twilightforest:adherent	Adherent	T2 · miniboss	none (spawn egg only)	no natural spawn in this version of the Twilight Forest (a mob meant for the unfinished Final Castle)	the mod's own drops	5
Twilight Forest	twilightforest:harbinger_cube	Harbinger Cube	T2 · miniboss	none (spawn egg only)	no natural spawn in this version of the Twilight Forest (a mob meant for the unfinished Final Castle)	the mod's own drops	5
Blue Skies	blue_skies:summoner	Summoner	T2 · rush	summoned-by-altar	nature_dungeon (snow_covered_pines biome, Everbright); use blue_skies:nature_key + summoning_tome. Boss Compass	gold_spell_book, source_gem, basic_reforging_token, waystone_core, simplyswords:hiveheart @ 15%, alchemy_scroll	2
Blue Skies	blue_skies:alchemist	Alchemist	T2 · rush	summoned-by-altar	poison_dungeon (sunset_maple_forest biome, Everdawn); use blue_skies:poison_key + summoning_tome. Boss Compass	oakskin_elixir, evasion_elixir, simplyswords:toxic_longsword @ 15%	2
Blue Skies	blue_skies:starlit_crusher	Starlit Crusher	T2 · rush	summoned-by-altar	everbright_blinding_dungeon (calming_skies / brisk_meadow biomes, Everbright); use blue_skies:blinding_key + summoning_tome. Boss Compass	lightning_upgrade_orb @ 15%, simplyswords:stars_edge @ 15%, runic_arc @ 5%	2
Blue Skies	blue_skies:arachnarch	Arachnarch	T2 · rush	summoned-by-altar	everdawn_blinding_dungeon (the Everdawn variant of the blinding dungeon); use the blinding_key + summoning_tome. Boss Compass	simplyswords:waxweaver @ 12%, runic_arc @ 5%	2
Mowzie's Mobs	mowziesmobs:frostmaw	Frostmaw	T2 · rush (T1 until 2026-10-16)	structure-locked	mowziesmobs:frostmaw_spawn in Everbright's frozen biomes (frostbitten forest and its clearing, snow-covered pines, polar highland, slushlands); strike the icicle it clutches to wake it. Boss Compass. It no longer generates in new Overworld chunks (chunks already generated keep theirs)	ice_crystal, frozen_core, mowziesmobs:naga_fang_dagger mats, Frostmaw Heart (T2 relic, relic sink 250 essence; was 150)	2
Terramity	terramity:ultra_sniffer	Ultra Sniffer	T2 · miniboss	scripted (after the Super Sniffer)	summoned by Super Sniffer's Pelt (Overworld)	sniffer_kamehameha	4
Terramity	terramity:trial_guardian	Trial Guardian	T2 · miniboss	structure-locked	the deep boss room of terramity:trial_spire, in Overworld ocean biomes	guardian_grimoire, guardians_hand, energized_core	3
Meet Your Fight	meetyourfight:bellringer	Bellringer	T2 · miniboss · rush	summoned-by-item	the Overworld (anywhere, with a Calling Bell)	mod-specific cosmetics, music disc, simplyswords:storms_edge @ 15% (since 2026-10-16)	4
Meet Your Fight	meetyourfight:swampjaw	Swampjaw	T2 · miniboss · rush	summoned-by-item	swamp biome (Bog Heart)	mod-specific cosmetics	4
Mutant Monsters	mutantmonsters:mutant_enderman	Mutant Enderman	T2 · miniboss · rush[^mutender]	scripted (Skull Spirit on Enderman)	The End or Endermen-spawning areas	mutant ender, endersoul fragment, simplyswords:slumbering_lichblade @ 15% (since 2026-10-16)	4
Majestic Menaces	majestic_menaces:teikoku_senshi	Teikoku Senshi	T2 · no tokens · rush[^teikoku]	summoned-by-item	an Ancient Relic, the mod's ruin in Overworld birch forests, flower forests and cherry groves; summoned at the relic's Ancient Core. Designed health 1,000	mod-specific drops	4
Ars Nouveau	ars_nouveau:wilden_boss	Wilden Chimera	T2 · no tokens · rush	summoned-by-altar	Ritual Brazier with Wilden Spike + Wilden Horn + Wilden Wing augments	wilden_tribute, source gem material	3

T2 subtotal: 22 rows, all on the boss list, 18 of them on the Tier 2 boss rush (the 8 Twilight Forest bosses, the 4 Blue Skies bosses, Frostmaw, Bellringer, Swampjaw, the Mutant Enderman, Teikoku Senshi and the Wilden Chimera). Off the roster: the Adherent and the Harbinger Cube (Twilight Forest minibosses with no natural spawn in this version of the mod), and Terramity's Ultra Sniffer and Trial Guardian (minibosses). The 3 Aether bosses moved to T4 on 2026-10-16, and Gundalf to T3 the same day.

Removed from Tier 2 on 2026-10-16: the three Ultris rows (Corrupted Enderman, Giant, Phantom Swarm; Ultris adds no entity types, and the first two are met in the Overworld and the swarm in the End, so they moved to the Tier 1 and Tier 4 tables), and the token fragments in the Twilight Forest drop lists (no such item exists; the bosses pay tier-2 kill tokens).

---

T3: Late-game mod content (Nether / Undergarden / Deeper Darker / the Abyss)

Mod	Entity ID	Display Name	Tier	Spawn Mechanism	Spawn Location	Notable Drops	Discovery Pain
L_Ender's Cataclysm	cataclysm:netherite_monstrosity	Netherite Monstrosity	T3 · rush	structure-locked	soul_black_smith, the mod's Soul Forge (crimson_forest / nether_wastes / soul_sand_valley / warped_forest, 60-spacing). Boss Compass	rare_ink, fire_rune, protection_rune, simplyswords:brimstone_claymore, terramity nyxium_greatsword 15%	2
L_Ender's Cataclysm	cataclysm:ignis	Ignis	T3 · rush	structure-locked + summoned-by-item	burning_arena (minecraft:nether_wastes, 80-chunk spacing): Burning Ashes on its Altar of Fire. Boss Compass	epic_ink, fire_upgrade_orb, diamond_spell_book @ 15%, simplyswords:molten_edge, terramity blasphemic_rapture @ 10%	2
L_Ender's Cataclysm	cataclysm:ignited_revenant	Ignited Revenant	T4 · rush T3	structure-locked	burning_arena, beside Ignis: the structure places it when it generates (the Ignited Berserkers of Nether fortresses are another mob). Designed health 1,000	the mod's own drops	4
L_Ender's Cataclysm	cataclysm:maledictus	Maledictus	T3 · rush	structure-locked	frosted_prison (minecraft:snowy_plains, 80-spacing): switching on the Cursed Tombstone in its lowest room wakes it. Boss Compass	rare_ink, ender_rune, simplyswords:twisted_blade	2
L_Ender's Cataclysm	cataclysm:the_harbinger	The Harbinger	T3 · rush	structure-locked	ancient_factory (#forge:is_underground, 112-spacing, deep Y-band). Boss Compass	epic_ink, ender_rune, ender_upgrade_orb, simplyswords:shadowsting	3
L_Ender's Cataclysm	cataclysm:the_leviathan	The Leviathan	T3 · rush	structure-locked	sunken_city (deep ocean variants: deep_ocean, deep_lukewarm_ocean, deep_cold_ocean, deep_frozen_ocean, 100-spacing). Boss Compass	rare_ink, ice_rune, diamond_spell_book @ 10%, simplyswords:livyatan, terramity davy_jones @ 10%, Leviathan's Pearl (relic, 40 %)	2
L_Ender's Cataclysm	cataclysm:the_baby_leviathan	The Baby Leviathan	T3 · not on a roster (a pet, since 2026-10-19)	hatched by a player	no structure: it hatches only from the Abyssal Egg the Leviathan drops, once a player places it, and can be tamed	n/a	3
L_Ender's Cataclysm	cataclysm:coralssus	Coralssus	T3 · miniboss · rush	structure-locked	sunken_city: the structure places Coralssi when it generates	uncommon_ink, nature_rune	4
L_Ender's Cataclysm	cataclysm:scylla	Scylla	T3 · rush	structure-locked	acropolis (minecraft:warm_ocean, built in the sky at about Y 200). Boss Compass	ice-themed drops, runic items	2
L_Ender's Cataclysm	cataclysm:amethyst_crab	Amethyst Crab	T3 · miniboss	biome-conditional-random	Overworld lush caves (a rare spawn)	blessed amethyst crab meat, the mod's own drops	4
Iron's Spellbooks	irons_spellbooks:dead_king	The Dead King	T3 · rush	structure-locked	irons_spellbooks:catacombs (hill / taiga / jungle / forest biomes + plains / desert / swamp / dripstone_caves / lush_caves). Boss Compass	blood_staff @ 50%, necronomicon_spell_book (first-kill guaranteed), Mahou attuned_diamond + kodoku, the Unholy Lance (Virtue's summon)	2
Iron's Spellbooks	irons_spellbooks:fire_boss	Echo of Tyros, First Flamebearer	T3 · rush	structure-locked	irons_spellbooks:pyromancer_tower (hill / forest / #forge:is_plains / #forge:is_swamp). Boss Compass	epic_ink, fire_upgrade_orb, blaze_spell_book (first-kill guaranteed)	2
Iron's Spellbooks	irons_spellbooks:citadel_keeper	Ancient Knight	T3 · rush	structure-locked	irons_spellbooks:citadel (overlays bastion_remnant in Nether). Boss Compass	keeper_flamberge @ 40%	2
Iron's Spellbooks	irons_spellbooks:archevoker	Archevoker	T3 · rush	structure-locked	irons_spellbooks:evoker_fort (hill / forest / #forge:is_desert / #forge:is_plains / savanna variants). Boss Compass	rare_ink, ender_rune, evoker_spell_book (first-kill guaranteed)	2
Iron's Spellbooks	irons_spellbooks:cryomancer	Cryomancer (mob, boss-tier)	T3 · miniboss · rush[^iss_mob]	biome-conditional-random	snowy biomes / mountain_tower (snowy_plains / snowy_taiga / grove / ice_spikes)	ice_staff @ 15%, ice_rune @ 25%	3
Iron's Spellbooks	irons_spellbooks:pyromancer	Pyromancer (mob, boss-tier)	T3 · miniboss · rush	biome-conditional-random	Nether/hot biomes	pyromancer 4-piece armor @ 8-12%/piece, fire_rune @ 20%	3
Iron's Spellbooks	irons_spellbooks:necromancer	Necromancer (mob, boss-tier)	T3 · miniboss · rush	biome-conditional-random	Catacombs / undead-themed biomes	rare_ink, blood_rune drops	3
Iron's Spellbooks	irons_spellbooks:magehunter_vindicator	Magehunter Vindicator	T3 · no tokens	structure-locked	evoker_fort (its tower, next to the Archevoker; the Boss Compass row has pointed there since 2026-10-15, not at the Mountain Tower). A boss since 2026-10-14: 500 health, and it cannot be beheaded or executed	rare_ink @ 15%, magehunter weapon @ 30%	3
Iron's Spellbooks	irons_spellbooks:priest	Priest	T3 · miniboss · rush	biome-conditional-random	various	priest staff, healing items	4
Undergarden	undergarden:forgotten_guardian	Forgotten Guardian	T3 · rush	structure-locked	undergarden:forgotten_vestige (Undergarden dimension, jigsaw 5-piece). Boss Compass	undergarden boss tokens, Mahou attuned_diamond	2
Undergarden	undergarden:forgotten	Forgotten	T3 · miniboss · rush	biome-conditional-random	the Undergarden's barren biomes	rare_ink, undergarden drops	4
Undergarden	undergarden:rotbeast	Rotbeast	T3 · miniboss · rush	biome-conditional-random	the Undergarden's overgrowth / wigglewood biomes	mod-specific drops	4
Deeper Darker	deeperdarker:stalker	Stalker	T3 · rush	structure-locked	deeperdarker:ancient_temple (the Otherside's deeplands biome). Boss Compass	stalker drops, sculk items, Mahou reagents	2
Deeper Darker	deeperdarker:shattered	Shattered	T3 · rush	biome-conditional-random	the Otherside: deeplands (weight 5) and echoing_forest (weight 17)	sculk-themed loot, Mahou items	4
Deeper Darker	deeperdarker:shriek_worm	Shriek Worm	T3 · miniboss	scripted	the Otherside: it bursts out of Infested Sculk	sculk-themed drops	4
Deeper Darker	deeperdarker:sculk_centipede	Sculk Centipede	T3 · no tokens	biome-conditional-random	the Otherside's deeplands	sculk-themed drops	4
Stalwart Dungeons	stalwart_dungeons:awful_ghast	Awful Ghast	T3 · miniboss · rush	structure-locked	Nether structures (Stalwart Dungeons)	rare_ink, fire_rune	3
Stalwart Dungeons	stalwart_dungeons:nether_keeper	Nether Keeper	T3 · miniboss · rush	structure-locked	Nether structures	rare_ink, blood_rune	3
Stalwart Dungeons	stalwart_dungeons:shelterer	Shelterer	T3 · miniboss · rush	structure-locked	Nether structures (armored variant)	rare_ink, fire_rune, armor pieces	3
Stalwart Dungeons	stalwart_dungeons:shelterer_without_armor	Shelterer (unarmored)	T3 · no tokens · rush	structure-locked	Nether structures	rare_ink, fire_rune	4
Stalwart Dungeons	stalwart_dungeons:incomplete_wither	Incomplete Wither	T3 · miniboss · rush	structure-locked	Nether structures	rare_ink, blood/cooldown runes, diamond_spell_book @ 10%	3
Stalwart Dungeons	stalwart_dungeons:reinforced_blaze	Reinforced Blaze	T3 · miniboss · rush	structure-locked	Nether fortress overlay	uncommon_ink, fire_rune	3
Stalwart Dungeons	stalwart_dungeons:giddy_blaze	Giddy Blaze	T3 · miniboss · rush	structure-locked	Nether fortress overlay	uncommon_ink, fire_rune	3
Meet Your Fight	meetyourfight:dame_fortuna	Dame Fortuna	T3 · rush	summoned-by-item	the Overworld, with a Calling Bell variant	mod-specific cosmetics	4
Meet Your Fight	meetyourfight:rosalyne	Rosalyne, Blade of Dusk	T3 · rush	summoned-by-item	dusk-time summon	mod-specific cosmetics	4
Vanilla (replaced by Progressive Bosses)	minecraft:wither; the entity you fight is progressivebosses:wither (Progressive Bosses swaps it in the moment a Wither is summoned or built)	Wither	T3 · rush	summoned-by-altar	the player builds the wither skeleton skull and soul sand cross (not inside the spawn village's circle)	2 Nether Stars, 3-6 Wither Bones, 2 Runic Tablets, 3 Rift Shards, a Void Fragment, Advanced Reforging Token (60%), Soulkeeper (15%); first kill per player: the Dormant Relic (15% on later kills). With two or more players near, those spoils come as one loot bag per player	1
Alex's Mobs	alexsmobs:warped_mosco	Warped Mosco	T3 · miniboss · rush	biome-conditional-random	Warped Forest (Nether)	rare_ink, fire_upgrade_orb	3
Terramity	terramity:gatmancer	Gatmancer	T3 · miniboss · rush	structure-locked	terramity:chthonic_dungeon in the Nether (its pieces hold the gatmancers). Boss Compass	the mod's own drops	3
Terramity	terramity:enchanter_merlin	Enchanter Merlin	T3 · rush (T1 until 2026-10-16; provisional)	structure-locked + summoned-by-item	terramity:chthonic_cathedral in the Nether: Occult Fabric on the Offering Pedestal summons Merlin and Circe together. Boss Compass	wizard staff, fairy summoning items	3
Terramity	terramity:sorceress_circe	Sorceress Circe	T3 · rush (T4 until 2026-10-16; provisional)	structure-locked + summoned-by-item	terramity:chthonic_cathedral in the Nether: Occult Fabric on the Offering Pedestal, with Merlin (the Mausoleum holds stray spawners only). Boss Compass	malediction_bracelets, evil_king_armor pieces	3
Terramity	terramity:gundalf	Archmage Gundalf	T3 · miniboss (T2 until 2026-10-16; provisional)	scripted (after Circe)	terramity:chthonic_cathedral in the Nether: it appears when Sorceress Circe falls. Boss Compass	gundalfs_hat, guardians_hand	3
The Abyss (TATOS)	theabyss:elder	Elder	T3 · no tokens	biome-conditional-random	the Abyss's Blue Mountain	Void Sight ring (10 %), an Abyssal Celestial Artifact (20 %)	3
The Abyss (TATOS)	theabyss:the_roka	The Roka	T3 · no tokens	biome-conditional-random	the Abyss's Blue Jungle (rare)	Embers ring (15 %), an Abyssal Celestial Artifact (50 %)	4
The Abyss (TATOS)	theabyss:nightblade_boss	Nightblade	T3 · no tokens	summoned-by-altar	the Abyss: at a Night Altar, light its eight upper pillars with Soul Hearts, then use an Eye of Abyss on it	Shadows and Phantom rings (15 % each), an Abyssal Celestial Artifact (always)	4
The Abyss (TATOS)	theabyss:ice_knight	Ice Knight	T3 · no tokens	biome-conditional-random	the Abyss's Frost World (Wayward Sea and Forgotten Mountains)	Frost ring (15 %), Knight ring (25 %)	3
The Abyss (TATOS)	theabyss:soul_guard	Soul Guard	T3 · no tokens	biome-conditional-random	the Abyss's Blue Mountain and Blue Jungle	Dark Pact ring (20 %), Unorithe armour (15 % a piece), Soul Hearts (to a Looting weapon only)	3
Cardinal Sins	cardinal_sins:linneausofsloth	Linneaus, Sin of Sloth	T3 · rush	structure-locked + summoned-by-item	icraft:cardinal_sins_sloth in the Abyss (pack structure, 2026-10-16): a Soulweaver Orb on the Malevolichite Shrine. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:sinofgluttony	Bacchus, Sin of Gluttony	T3 · rush	structure-locked + summoned-by-item	icraft:cardinal_sins_gluttony in the Abyss (pack structure, 2026-10-16): a Sloth Soul Orb on the shrine. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:sinoflust	Freya, Sin of Lust	T3 · rush	structure-locked + summoned-by-item	icraft:cardinal_sins_lust in the Abyss (pack structure, 2026-10-16): a Gluttony Soul Orb on the shrine. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:sinofgreed	Ebenezer, Sin of Greed	T3 · rush	structure-locked + summoned-by-item	icraft:cardinal_sins_greed in the Abyss (pack structure, 2026-10-16): a Lust Soul Orb on the shrine. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:sinofenvy	Odhran, Sin of Envy	T3 · rush	structure-locked + summoned-by-item	icraft:cardinal_sins_envy in the Abyss (pack structure, 2026-10-16): a Greed Soul Orb on the shrine. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:sinofwrath	Beowulf, Sin of Wrath	T3 · rush	structure-locked + summoned-by-item	icraft:cardinal_sins_wrath in the Abyss (pack structure, 2026-10-16): an Envy Soul Orb on the shrine. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:sinofpride	Leon, Sin of Pride	T3 · rush	structure-locked + summoned-by-item	icraft:cardinal_sins_pride in the Abyss (pack structure, 2026-10-16): a Wrath Soul Orb on the shrine. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:drakara	Drakara, Eternal Mourner	T3 · rush	structure-locked	icraft:cardinal_sins_drakara, underground in the Abyss (pack structure, 2026-10-16); there is no shrine, it waits in its arena. Boss Compass	sin-themed drops	3
Cardinal Sins	cardinal_sins:lucifer	Lucifer, The Atrocity (the T3 to T4 combat capstone)	T4 · rush T3	structure-locked + summoned-by-item	icraft:cardinal_sins_lucifer in the Nether (pack structure, 2026-10-16): a Pride Soul Orb on the Atrocity Shrine. Boss Compass	Cursed Sigil of Pride (relic, 40 %), sin-themed drops	3
Ultris	minecraft:blaze (Ultris)	Blaze King	off list (T3 area)	structure-locked	Ultris's Blaze King Tower (1_splatus:blaze_king_tower), in Nether fortress biomes	Blaze King's Helmet, the Endstone Key (opens the Shulker Stone's fight, Tier 4 table)	3
Ultris	minecraft:wither (Ultris)	Ultra Wither (cannot be made in this pack)	off list	summoned-by-item	Ultris builds it from a vanilla Wither hit by a thrown Ominous Pearl (the Corrupted Enderman's drop). Every Wither in this pack is Progressive Bosses' own entity, so Ultris never finds a Wither to transform; the stronger Wither of this pack is the Ultimate Wither (Tier 4 table)	n/a	n/a

Iron's Spellbooks' casters: the Cryomancer, Pyromancer, Necromancer and Priest are boss-tier mobs without a boss bar. The pack counts them as minibosses (tokens on every kill), and all four are on the Tier 3 boss rush.

Cardinal Sins and Lucifer (added 2026-06-01; the catalog predated this ladder). The mod escalates from 7 sins to Lucifer, then Drakara. The mod places its arenas only in the Overworld; since 2026-10-16 they are pack structures built from the mod's own templates, Lucifer's in the Nether and the other eight in the Abyss. Every shrine takes the previous sin's Soul Orb and works once: Sloth → Gluttony → Lust → Greed → Envy → Wrath → Pride → Lucifer; Drakara waits in its arena. Lucifer is the last boss of the Tier 3 boss rush: clearing 100% of the T3 roster, Lucifer included, is the combat route to T4. His kill pays tier-4 tokens, but a single Lucifer kill grants no tier (the old milestone routes were retired on 2026-06-01, and the designed Lucifer's Token is not in the game). The non-combat lanes (Engineering or Magic, banking the 2,000-token threshold) skip him entirely. The first phases of Lucifer and of three sins (Envy, Pride, Wrath) are separate entities the game shows before the real fight; a kill of a phase is credited to its boss on the roster.

T3 subtotal: 57 rows. 55 are on the boss list: 45 on the Tier 3 boss rush (the Ignited Revenant and Lucifer included, who pay tier-4 tokens), and off the roster the Magehunter, the Amethyst Crab, Deeper Darker's Shriek Worm and Sculk Centipede, Terramity's Gundalf, and the five Abyss bosses. The other 2 rows are Ultris's (the Blaze King, and the Ultra Wither, which cannot be made). The Tier 3 roster by mod: 9 Cataclysm + 8 Iron's Spellbooks + 3 Undergarden + 2 Deeper Darker + 7 Stalwart Dungeons + 2 Meet Your Fight + the Wither + 1 Alex's Mobs + 3 Terramity (Gatmancer, Merlin, Circe) + 9 Cardinal Sins incl. Lucifer = 45.

Removed from Tier 3 on 2026-10-16: the four Marium's Soulslike Weaponry bosses (Decaying King, Chaos Monarch, Day Stalker, Night Prowler; the mod is not in the pack), undergarden:masticator and mutantmonsters:mutant_zombie_villager (not entity types of the installed mods), Ultris's Sanctum Keeper (met in the Overworld: Tier 1 table), and Lucifer's Token from Lucifer's drops (no such item).

---

T4: Endgame (the Aether incl. Deep Aether's biomes / End / Ad Astra)

Mod	Entity ID	Display Name	Tier	Spawn Mechanism	Spawn Location	Notable Drops	Discovery Pain
L_Ender's Cataclysm	cataclysm:ender_guardian	Ender Guardian	T4	structure-locked	ruined_citadel (end_highlands / end_midlands, 50-spacing). Boss Compass	epic_ink, legendary_ink, ender_rune, ender_upgrade_orb, netherite_spell_book @ 10%, simplyswords:arcanethyst, Mahou attuned_diamond, antimatter_pacemaker 10%, null_scarf 12%	1
L_Ender's Cataclysm	cataclysm:ender_golem	Ender Golem	T4 · miniboss	structure-locked	ruined_citadel + scripted spawn	mid-tier T4 drops	3
L_Ender's Cataclysm	cataclysm:ancient_remnant	Ancient Remnant	T4 (T3 until 2026-10-18; provisional)	structure-locked	cursed_pyramid (minecraft:desert, 80-spacing): the structure places it asleep in its lower chamber. Designed health 2,500. Boss Compass	ultimate reforging token @ 57%, simplyswords:awakened_lichblade (Voidheart Blade base) @ 15%, terramity:kamehameha @ 5%, rare_ink, blood_rune, kodoku, ancient metal ingots, 5 Rift Shards + 4 Void Fragments, Relic of the Remnant (relic, 40 %)	2
Vanilla	minecraft:ender_dragon	Ender Dragon	T4	dimensional-arrival	The End, main island	dragon egg, advancement chain, legendary_ink, terramity:planet_buster @ 15%, antiprism @ 10%, dragon_band @ 12%, Mahou attuned_diamond, Rift Shards + Void Fragments	1
Botania	botania:doppleganger	Guardian of Gaia	T4	summoned-by-altar	the player builds the Gaia ritual (an active Beacon ringed by Gaia Pylons) and sneak-right-clicks the Beacon with a Terrasteel Ingot	gaia_ingot, gaia_block, dice_of_fate	2
Aether	aether:slider	Slider	T4 (T2 until 2026-10-16)	structure-locked	bronze_dungeon (Aether dimension, bronze biome). Boss Compass	bronze_dungeon_key, carved_stone, simplyswords:thunderbrand, too_many_bows:scatter_bow, advanced_reforging_token @ 60%, epic_ink, lightning_upgrade_orb, 1-2 Rift Shards + Void Fragment, 2 Artifact Piece Pouches (+ small awakening-artifact chance), terramity:olympus @ 5%, tier-4 first-kill token	1
Aether	aether:valkyrie_queen	Valkyrie Queen	T4 (T2 until 2026-10-16)	structure-locked + scripted	silver_dungeon (Aether); interact with the Valkyrie inside to begin the fight. Boss Compass	magehunter @ 30%, simplyswords:caelestis, too_many_bows:wind_bow, too_many_bows:radiance, 1-2 Rift Shards + Void Fragment, tier-4 first-kill token	2
Aether	aether:sun_spirit	Sun Spirit	T4 (T2 until 2026-10-16)	structure-locked + scripted	gold_dungeon (Aether); it needs the summon ritual on the Sun Altar. Boss Compass	simplyswords:sunfire, too_many_bows:aethers_call, legendary_ink, fire + holy upgrade orbs, Sunfeather Charm (T4 relic), 1-2 Rift Shards + Void Fragment, terramity:divine_intervention @ 10%, tier-4 first-kill token	2
Deep Aether	deep_aether:eots_controller	Eye of the Storm	T4	structure-locked	deep_aether:brass_dungeon (Deep Aether biomes, inside the Aether dimension). Boss Compass	t4 sky-end drops, simplyswords:flamewind @ 15%	2
Terramity	terramity:virtue	Virtue	T4	summoned-by-item	terramity:prismatic_pond in the Deep Aether land biomes of the Aether (relocated 2026-05-30; it generates on the surface since 2026-10-16 and never generated before then). The only summon is the Unholy Lance (the Dead King's drop) thrown into its prism solution; the Overworld summon is refused. Boss Compass	archangel_halo, holy items	3
Terramity	terramity:thunker	Thunker	T4 · miniboss	biome-conditional-random	every Nether biome (a common spawn), and some halls and rooms of the Chthonic Dungeon (terramity:chthonic_dungeon). The Boss Compass has led to the Chthonic Dungeon since 2026-10-17 (before that it led to the Chthonic Cathedral, which holds no Thunker)	giant_dungeon_slab	2
Terramity	terramity:uvogre	Uvogre	T4 · miniboss	biome-conditional-random	any biome of any dimension (a rare spawn)	mod drops	4
Terramity	terramity:duskrok	Duskrok	T4 · miniboss	biome-conditional-random	Overworld deserts and badlands, the Nether's soul sand valley (rare)	mod drops	4
Terramity	terramity:hellrok	Hellrok	T4 · miniboss	biome-conditional-random	the Nether's wastes and crimson forests (rare)	mod drops	4
Alex's Mobs	alexsmobs:void_worm	Void Worm	T4 · miniboss	summoned-by-item	The End: toss a Mysterious Worm into the void	mysterious_worm essence, void-themed drops, legendary_ink	4
Alex's Mobs	alexsmobs:cachalot_whale	Cachalot Whale (white variant)	off list (Overworld oceans)	biome-conditional-random	lukewarm/cold/deep oceans (the white variant is a rare spawn)	cachalot whale tooth, leg/uncommon ink	5
Progressive Bosses	progressivebosses:wither at level 3 (the same entity as the Wither; the level comes from the block it is built with)	Ultimate Wither (optional)	T3 · rush (it is the Wither's entry; designed health 1,000 at level 3)	summoned-by-altar	the Nether only: the Wither's T with Corrupted Soul Sand (soul sand or soul soil + 3 Nether Stars, a Tier 4 recipe) in the centre of the arms; anywhere else the build is refused and the blocks stay	3,000 health, heavy armour; 5 Nether Stars, 2 Netherite Upgrade templates, 3,000 XP and the Wither's other spoils (with two or more players near: a plain Wither's loot bag per player instead). Quest: Challenge: The Ultimate Wither	1
Ultris	minecraft:phantom (Ultris)	Phantom Swarm	off list (T4 area)	scripted	a random event on the End's outer islands, away from End Cities	the mod's own drops	4
Ultris	minecraft:cow (Ultris's construct)	Shulker Stone	off list (T4 area)	summoned-by-item	Ultris's End pyramid (1_splatus:endcity_pyramid, beside End Cities): insert the Endstone Key (the Blaze King's drop) at the pedestal on top	the Shulker Shell Helmet	3
Multiplayer Bosses[^mpb]	(enhances vanilla Dragon/Wither/Warden)	(no new entity)	n/a	n/a	enhances existing kill targets	LootBag drops	n/a
Vanilla	minecraft:warden	Warden	T4	structure-locked	Ancient Cities (deep dark biome)	sculk catalyst, echo shard, Mahou attuned_diamond (cross-mod drop)	2

Removed on 2026-06-01 (entities not in the pack): cataclysm:void_blossom[^void_blossom] (the entity belongs to bosses_of_mass_destruction, which is not in the pack, not to Cataclysm) and lu_more_bosses_and_mobs:end_dwellee[^lmore] (LuMoreBossesAndMobs is not installed) were dropped from the T4 table.

T4 subtotal: 21 rows. 16 are Tier 4 bosses on the boss list (the Ender Dragon, the Warden, Ender Guardian, the Ancient Remnant, Guardian of Gaia, the three Aether bosses, Eye of the Storm and Virtue, plus the minibosses Ender Golem, the Void Worm, Thunker, Uvogre, Duskrok and Hellrok). The others are the Ultimate Wither (the Wither's own entry, level 3) and 4 rows off the list (Cachalot Whale, two Ultris bosses, Multiplayer Bosses). Lucifer and the Ignited Revenant also pay tier-4 tokens; they are listed under T3, whose boss rush they count for. T4 has no boss rush. The Ender Dragon is the pack finale, reached with Eyes of Ender (staged at T4). A planned End Compass and End Bastion, the compass crafted from the Aether's materials, would replace them.

Removed from Tier 4 on 2026-10-16: the Ancient Remnant (then a Tier 3 boss; back in this table since 2026-10-18, when the registry made it tier 4 to match its loot and health), the second Mutant Enderman row (it is a Tier 2 miniboss wherever it is met), the Mutant Snow Golem (a golem the player builds: an ally, not a boss), Sorceress Circe (Tier 3 since 2026-10-16) and Terramity's Dungeon Effigy (it lives in the Overworld's Trial Spire: Tier 1 table).

---

Postgame / Ascension (designed, not all entity-backed)

Mod	Entity ID	Display Name	Tier	Spawn Mechanism	Spawn Location	Notable Drops	Discovery Pain
Mythic Forge[^mythic]	n/a (designed as KubeJS-spawned mob waves)	Rift floor guardians	postgame	scripted	Oblivion's Rift floors (designed, not built: for now Rift Shards and Void Fragments drop from Tier 4 bosses and End mobs)	Rift Shard, Void Fragment, Rift Core	5 (no compass support: Rift floors are sequential, so there is nothing to look up)
Botania	botania:magic_landmine	Gaia Trap	postgame	scripted (Gaia ritual support entity)	Gaia ritual arena	n/a (mechanism, not boss)	n/a

Postgame subtotal: Rift bosses would be procedurally generated (designed, not built) and are outside the compass scope.

---

Summary

Not every boss in this catalog counts toward the boss rush. The boss rush credits a kill by the boss's entity type, and its rosters hold only bosses that exist as entity types in the current pack: 9 in Tier 1, 18 in Tier 2 and 45 in Tier 3. These numbers date from 2026-10-16, when Frostmaw moved from Tier 1 to Tier 2, the Aether's three dungeon bosses from Tier 2 to Tier 4 (which has no boss rush), and Merlin and Circe to Tier 3; before that they were 11, 20 and 43. The Brutal Bosses champions and the Ultris bosses are left out because they cannot be recognised (those mods add no entity types of their own). Teikoku Senshi is majestic_menaces:teikoku_senshi.

The rosters come from the pack's boss registry and include minibosses (the three Mutant Monsters and Mowzie's Naga in Tier 1; Swampjaw, the Bellringer and the Mutant Enderman in Tier 2; Coralssus, Iron's Spellbooks' four casters and the Stalwart Dungeons bosses in Tier 3, among others). Since 2026-10-15 a tier can be bought only while holding the tier below. Minibosses on no roster also pay tokens on every kill: MCA's mca:grim_reaper (Tier 1), the Twilight Forest's Adherent and Harbinger Cube (which do not spawn naturally) and Terramity's Ultra Sniffer and Trial Guardian (Tier 2), the cataclysm:amethyst_crab, Deeper Darker's Shriek Worm and Terramity's Gundalf (Tier 3), and the Tier 4 minibosses. The Twilight Forest's twilightforest:plateau_boss, a placeholder that crashed the server when it died, has been kept out of the world since 2026-10-15.

Total: 117 rows (17 + 22 + 58 + 20), of which 104 are bosses on the pack's boss list (the Ultimate Wither, the Wither's level 3, counted once): 72 on a boss-rush roster (9 + 18 + 45), the rest minibosses on no roster or bosses that pay no tokens. The other rows are the Brutal Bosses champions (one row), eight Ultris bosses (seven that exist as vanilla mobs, and the Ultra Wither, which cannot be made here), Terramity's Dungeon Effigy, the white Cachalot Whale and Multiplayer Bosses. The per-tier boss-rush rosters (the boss registry's rush field) are the denominators for the 80, 90 and 100% advance routes. Everything else on this list is additional boss-tier content the compass could optionally support.

Rough tier distribution

Tier	Rows	Of which Discovery Pain ≥4
T1	17	8
T2	22	7
T3	58	14
T4	20	6
Total	117	35

About 30% of the catalog scores Discovery Pain 4 or higher, so a player without an external wiki has no reliable way to find those bosses in game. The compass system exists mainly for them.

Mods contributing the most "discovery pain" (Discovery Pain ≥4)

1. Mutant Monsters (4 high-pain entries): the mutant variants come from Skull Spirit summoning or rare natural spawns, and the Codex doesn't explain them.
2. Ultris (4 high-pain entries): the Corrupted Enderman, the Illusioner and the Phantom Swarm are random events and the Giant comes from a potion thrown at a zombie, with no structure Explorer's Compass can find; the Ultra Wither cannot be made at all.
3. Terramity (4 high-pain entries): the Ultra Sniffer summon and the rare Uvogre, Duskrok and Hellrok spawns have no compass support.
4. Meet Your Fight (4 high-pain entries): every Meet Your Fight boss is summoned by an item, and nothing in game says how to craft it.
5. L_Ender's Cataclysm and Deeper Darker (3 each): the Ignited Revenant and Coralssus appear only after another boss falls, and the Amethyst Crab is a rare lush-cave spawn; the Shattered, Shriek Worm and Sculk Centipede are Otherside spawns with no structure to find.
6. Twilight Forest (2 entries, score 5): the Adherent and the Harbinger Cube have no natural spawn at all in this version of the mod, so they are on the boss list but cannot be met in survival.
7. Undergarden, The Abyss, Alex's Mobs (2 each): biome spawns (Forgotten, Rotbeast, The Roka), an altar ritual the Codex doesn't fully explain (Nightblade), a crafting chain (Void Worm) and a 0.1% rare variant (white Cachalot Whale).
8. Iron's Spellbooks (1 high-pain entry, the Priest; the three other casters score 3): these are boss-tier mobs without a boss bar that spawn naturally in matching biomes.

Patterns observed in spawn mechanism distribution

Counts by spawn mechanism over the 117 rows, as of 2026-10-16:

Mechanism	Count	%	Compass strategy
structure-locked (incl. structure + summon, + trade, + scripted)	59	50%	Already partly solved by Explorer's Compass; the compass only needs the right structure name for each boss.
biome-conditional-random	21	18%	Nothing solves it yet. The compass needs the biome list and dimension, and must direct the player to a chunk where the boss can spawn.
summoned-by-altar	11	9%	The problem is knowing the ritual. The compass should show the summoning recipe and the altar location once the player has the ingredients.
summoned-by-item	9	8%	The compass should show the summon item's craft tree, since the boss has no fixed location.
scripted	13	11%	The hardest group. The compass needs to show the trigger condition (e.g., "Spawn after killing Leviathan in warm_ocean").
dimensional-arrival	1	1%	The Ender Dragon. A compass is overkill, but cataloging it helps Compendium completion.
none (spawn egg only)	2	2%	The Twilight Forest's Adherent and Harbinger Cube: nothing to point at.
n/a	1	1%	Multiplayer Bosses (no entity of its own). Skip.

Outliers / oddities the compass design will need to handle

• Bosses with multiple spawn locations: the Aether's Sun Spirit needs both the gold_dungeon structure and a Sun Altar ritual the player performs inside it. The compass should chain the two: locate the dungeon, then show a "use sun altar with summon item" overlay.
• Regional variants: Cataclysm's Coralssus spawns by script after a Leviathan kill (The Baby Leviathan hatches from the egg a player places, and is no target). The compass should hide them from the discovery list until the Leviathan is dead, then reveal "go back to a warm_ocean / acropolis".
• Conditional summoning: several bosses spawn wherever the player sets them off (Ultris's Giant, the Meet Your Fight bosses, the Void Worm), so the compass has no location to point to. The best display is the recipe plus "summon anywhere in dim X". (Ultris's Ultra Wither, the example here until 2026-10-16, cannot be made in this pack.)
• Bosses whose tier differs from where they are met: the Thunker (Tier 4) shares the Nether's Chthonic Dungeon with the Gatmancers (Tier 3); Lucifer and the Ignited Revenant pay tier-4 tokens but count for the Tier 3 rush; the Ultra Sniffer and Trial Guardian (Tier 2) are met in the Overworld. The compass shows each boss under its registry tier.
• Boss-tier mobs and boss-bar bosses: Iron's Spellbooks' Pyromancer, Cryomancer, Necromancer and Priest, the Mutant Monsters variants and the Stalwart Dungeons minibosses have no boss bars; they are high-HP, high-damage mobs. The compass interface needs to tell a "trophy boss with a bar" from a "boss-tier mob you should grind for drops", possibly with two sections.
• Structure-locked but dimension-conditional: the Iron's Spellbooks Citadel overlays minecraft:has_structure/bastion_remnant (Nether). The compass needs an "only show after player has T3" filter: the bastion is in the Nether, which stays locked until the player holds Tier 3, and the Citadel Keeper drops T3 loot. The AStages stage flag should be the compass's visibility filter.
• Bosses with no way to meet them: the Twilight Forest's Adherent and Harbinger Cube are on the boss list but have no natural spawn in this version of the mod (spawn eggs only). The compass should leave them out, since there is nothing to point at. (terramity:dungeon_effigy, the example here until 2026-10-16, lives in the Overworld's Trial Spire.)
• Custom origins and class-tied content (Witch of Ink, Artificial Construct): both are origins of the pack, and boss kills raise the Witch of Ink's kill counter. The Witch of Ink "dimension" referenced in Master-Design-Document Part IV is planned content, not yet a separate dimension in the pack. Leave it out of the compass for now.

---

[^t1cata]: cataclysm:old_netherite_monstrosity appeared as a legacy entity ID in Cataclysm's language file; the installed Cataclysm registers no such entity (the Netherite Monstrosity is cataclysm:netherite_monstrosity, Tier 3). Its Tier 1 row was removed on 2026-10-16.

[^lmore]: LuMoreBossesAndMobs is not installed (checked 2026-05-30): there is no lu_more/lumore/moreboss jar in mods/, and macholote / gold_mini_golem are not registered entities in the live pack. Its two T1 rows were removed, and so was its design block in master-appendix.md §C.12.

[^teikoku]: Majestic Menaces' jar is named "Majestic Manaces"; its entity is majestic_menaces:teikoku_senshi. (The catalog used to name a crazybossfights namespace; no such entity exists.) The registry gives it a designed health of 1,000 and the x3 boss buff, and keeps it on the Tier 2 rush without kill tokens.

[^iss_mob]: The Iron's Spellbooks Cryomancer, Pyromancer, Necromancer and Priest are boss-tier mob spawns without boss bars. They are listed because the pack counts them as minibosses on the Tier 3 boss rush, and master-appendix.md §C.1 assigns their drops.

[^mutender]: The Mutant Enderman is a Tier 2 miniboss wherever it is met: a Skull Spirit on an Enderman makes one, and they also appear in the End. Until 2026-10-16 the catalog listed it a second time under T4.

[^void_blossom]: cataclysm:void_blossom is mentioned in master-appendix.md §D.6 with 2000 HP base, but the Void Blossom comes from the bosses_of_mass_destruction mod, which is not in this pack.

[^mpb]: Multiplayer Bosses strengthens the vanilla Dragon, Wither and Warden with a LootBag drop and tougher AI, but registers no new entity. It is listed here because the design treats vanilla bosses as T3/T4 progression bosses.

[^mythic]: Rift bosses were designed as KubeJS-spawned procedural mob waves on each Rift floor (Loop 1 endgame); the floors are not built. They are not entity-backed bosses and are out of compass scope.