Bosses

Bosses

Every world ends with a boss, and the Surface has the Block Guardian. All eleven use the same readable attack system: each attack is announced, executed, then leaves an opening. This page describes that system as coded in MatrioBoss.java, then every boss.

Overview

Boss	Where	Health	Damage	Phase thresholds	Core
Block Guardian	Surface	300	12	50%	Guardian Core
Spore Queen	World 1	500	12	66%, 33%	Queen Core
Ash Titan	World 2	675	14.4	66%, 33%	Titan Core
Grand Jailer	World 3	911	17.3	66%, 33%	Jailer Core
Storm King	World 4	1230	20.7	66%, 33%	Storm King Core
Light Eater	World 5	1661	24.9	66%, 33%	Light Eater Core
Your Double	World 6	2242	29.9	66%, 33%	Double Core
Pressure Leviathan	World 7	3027	35.8	66%, 33%	Leviathan Core
Master of Seasons	World 8	4086	43	66%, 33%	Seasons Core
Heart of the Terrain	World 9	5516	51.6	66%, 33%	Terrain Core
The Unfinished	World 10	14894	61.9	90% to 10%, every 10%	Unfinished Core

Health and damage values already include the world multipliers (see Difficulty formulas). Every boss also has 8 armor, full knockback resistance, a 48-block follow range, fire immunity and no fall damage.

Every boss is heard before it is seen: while it is near and idle, it has a presence sound of its own, a breath, a growl or a hum in its world's colour (see Sounds).

Summoning

The stage closes round the fight: in a lair, a portcullis drops over the chamber's doorway when the boss wakes; in an altar arena, the entrance arch is barred and the rim burns with the world's light. Both open again when the boss falls, or after 20 seconds with nobody inside (to let fallen players back in), and close again behind the first one back.

• Use the altar: the Guardian's Altar on the Surface, or the Arena Altar in the arena 160 blocks south of a world's Threshold. The boss appears 2 blocks above the altar and targets you.
• Only one boss can be awake within 48 blocks of you.
• Bosses can be summoned again after they are beaten. For the Block Guardian the altar prints a reminder but still wakes it.

Attack structure

Each boss has three attacks, a light one, a medium one and a signature one, and cycles through three states.

1. Chase. The boss walks (or flies, or swims) toward its target and picks an attack when one is off cooldown, after at least half a second of chasing.
2. Telegraph. It stops, plays its charge or strike animation and a world-specific sound, and the attack name appears above your hotbar (gold for medium, red for the signature). For medium and signature attacks a ring of particles marks the area it aimed at (radius 3, or 5 for the signature, with flames).
3. Execution. The attack fires. The aim point is locked when the telegraph starts, so moving away during the telegraph is the main way to dodge.
4. Opening. After a medium or signature attack the boss rests. During this window it takes 150% damage; the rest of the time it takes only 75%. Light attacks have no opening.

Choosing an attack

Attack	Cooldown (ticks)	When it is picked
Light	80 - 5 x phase	Target within 5 blocks
Medium	160 - 10 x phase	Preferred when the target is farther than 4 blocks
Signature	400 - 20 x phase	When ready. Before the first phase change it passes a 1 in 3 roll each tick, so it still comes out within moments

Timing windows

The telegraph and opening lengths depend on the world tier.

Worlds	Telegraph (medium)	Telegraph (signature)	Telegraph (light)	Opening after medium	Opening after signature
Surface, 1 to 3	30 ticks (1.5 s)	60 ticks	15 ticks	60 ticks (3 s)	30 ticks
4 to 6	20 ticks (1 s)	40 ticks	10 ticks	50 ticks	25 ticks
7 to 9	15 ticks	30 ticks	7 ticks	40 ticks	20 ticks

The Unfinished borrows the attacks of the world its current shell copies but always keeps the shortest tier, World 10 (12-tick telegraph, 30-tick opening), on every shell: the final fight tests everything at the fastest pace. A World Block shaken from outside to help makes a boss stagger and stay open for 3 seconds (see Effects between the scales).

Phases

• Most bosses change phase at 66% and 33% of their health. The Block Guardian has one change at 50%. The Unfinished breaks a shell at every 10%.
• On a phase change the boss roars, becomes invulnerable for 2 seconds, gets 10% faster, adds a numeral to its boss bar and shows the name of its final-phase move. Its body cracks: glowing cracks of its world's colour after the first change, many more after the second.
• Cooldowns shrink with each phase (see the table above) and the signature attack is always used when ready after phase 1.
• Special phase effects: the Guardian heals 10% at 50%; the Spore Queen becomes invulnerable behind three Chitin Guard nodes at 33%; the Ash Titan takes 30% more damage from 33%.

Rewards

When a boss dies, every player within 64 blocks:

• marks the boss as defeated for their group (this unlocks the way into the next world, recipes and gates);
• gets 100 souls and the kill for quests;
• gets one Doll of Life layer back, and one extra maximum layer after the bosses of worlds 1, 5 and 8 (see Doll of Life and death);
• gets 3 Shell Shards, the material of class upgrades;
• reads the boss's revelation line in chat.

Once it has folded into its doll, the boss drops its core, which opens the way into the next world (the World 10 core is a trophy); the bosses of Worlds 1 to 9 drop no World Soil. The Block Guardian also drops a Matrix Workbench and 4 World Soil 0, the soil the World 1 Seed is planted on, and turns every Artisan's Scroll it finds in nearby inventories into the Journal. The World 9 boss also drops the Key of the Last Doll. Each boss gives 200 experience.

The boss bar

Every boss has a bar of its own, drawn for what it is and the world it rules, in place of vanilla's:

Boss	Its bar	Its gauge
Block Guardian	mossy stone, runed pillars with floating cubes	stone blocks filling one by one
Spore Queen	ribbed chitin, mushroom clusters, a toxin pod	a bubbling toxic sludge
Ash Titan	riveted black iron, furnaces and a smoking stack	molten metal under a bright crust
Grand Jailer	dark iron, padlocks, chains, bars across the gauge	blue soul fire
Storm King	a copper conduit in storm clouds, lightning rods	a lightning arc
Light Eater	smoke and tendrils, a violet eye at each end	a dark that swallows motes of light
Your Double	a mirror, mint above and pink below	a mirrored gauge that empties from both ends
Pressure Leviathan	a brass diving pipe, a porthole and a pressure dial	deep water
Master of Seasons	clockwork brass, a gear and a clock	the four seasons along its quarters
Heart of the Terrain	layered rock with red veins, a heart crystal	a heartbeat running along it
The Unfinished	a doll painted at one end and sketched at the other	red lacquer over pencil hatching, ten shells

The damage just taken lingers as a pale trail, each phase is a notch on the gauge, the name flashes when the boss is hit, and the ends of the bar come alive (the clock turns, the heart beats, the furnaces flicker).

Defeat

A fallen boss folds back into its doll while its death animation plays: two rings of gold, one rising from its feet and one coming down from above its head, close on it. Its name is sealed on a card ("Sealed back in its doll"), and its relics fall from a column of light once the doll has closed, about two seconds after the last blow. A boss removed before that (its chunk unloaded) still leaves its relics where it stood.

Multiplayer scaling

Health is multiplied by 1 + 0.6 x (players - 1), counting the players within 48 blocks of the altar when the boss is summoned.

Players	Health multiplier	Spore Queen health
1	x1.0	500
2	x1.6	800
3	x2.2	1100
4	x2.8	1400
6	x4.0	2000
8	x5.2	2600

Attack speed is multiplied by 1 + 0.05 x (players - 1) (x1.05 with 2 players, x1.15 with 4, x1.35 with 8). It is recounted every five seconds from the players within 48 blocks of the boss, so it follows the fight as players arrive or fall.

In a New Cycle bosses also gain +50% health and +25% damage per cycle, and the variant of their world scales their danger too.

Bosses

Block Guardian

Surface · 300 health · 12 damage · summoned at the Guardian's Altar in the Guardian's Sanctuary, on the Surface.

Attack (name shown on screen)	What the code does
Light: Punch	Frontal strike: 60% damage within 3.2 blocks in front of it.
Medium: Shockwave	Ground shockwave, radius 7: 70% damage and a launch, but only to targets standing on the ground. Jump over it.
Signature: Torn Block	Throws 3 + phase cobblestone blocks that fall from 10 blocks above you and around you.
Final phase: Rebuilds itself from the arena	At 50% health it heals 10% of its maximum health.

Spore Queen

World 1 · 500 health · 12 damage · summoned at the Arena Altar of World 1.

Attack (name shown on screen)	What the code does
Light: Root Snare	Frontal strike: 60% damage within 3.2 blocks.
Medium: Toxic Cloud	Poison cloud (radius 4, Poison II) at the spot it aimed at; +15 toxin to players inside.
Signature: Call of Sporelings	Summons 4 + 2 x phase Sporelings.
Final phase: Cocoon guarded by nodes	At 33% health it summons 3 Chitin Guards; they and every other creature within 8 blocks become cocoon nodes, and the Queen takes no damage until all of them are dead.

Ash Titan

World 2 · 675 health · 14.4 damage · summoned at the Arena Altar of World 2.

Attack (name shown on screen)	What the code does
Light: Hammer Blow	Frontal strike: 60% damage within 3.2 blocks.
Medium: Ash Spray	Ash burst at the aimed spot: 80% damage within 3.5 blocks.
Signature: Rising Lava	Lights a ring of fire of radius 6 + 2 x phase around itself, with a shockwave (50% damage) inside the ring.
Final phase: Molten armor, exposed heart	From 33% health it takes 30% more damage (molten armor).

Grand Jailer

World 3 · 911 health · 17.3 damage · summoned at the Arena Altar of World 3.

Attack (name shown on screen)	What the code does
Light: Chain Pull	Frontal strike: 60% damage within 3.2 blocks.
Medium: Floor Cage	Chain pull: drags everything within 18 blocks toward it.
Signature: Moving Walls	Cages every player within 16 blocks in iron bars.
Final phase: The arena becomes a cell	Phase change only (speed up, faster cooldowns).

Storm King

World 4 · 1230 health · 20.7 damage · summoned at the Arena Altar of World 4. It flies and hovers 5 blocks above its target.

Attack (name shown on screen)	What the code does
Light: Gust	Frontal strike: 60% damage within 3.2 blocks. Flies 5 blocks above its target.
Medium: Called Lightning	Gust: throws everything within 14 blocks away from it.
Signature: Shattered Islet	Calls 4 + phase lightning bolts around the aimed spot.
Final phase: Fight on drifting debris	Phase change only.

Light Eater

World 5 · 1661 health · 24.9 damage · summoned at the Arena Altar of World 5.

Attack (name shown on screen)	What the code does
Light: Claw in the Dark	Frontal strike: 60% damage within 3.2 blocks.
Medium: Lights Out	Lights out: Darkness for 8 seconds within 24 blocks, and breaks torches and lanterns within 10 blocks.
Signature: Silent Charge	Silent charge: dashes at you, 90% damage within 2.5 blocks of you.
Final phase: Track it by sound only	Phase change only.

Your Double

World 6 · 2242 health · 29.9 damage · summoned at the Arena Altar of World 6.

Attack (name shown on screen)	What the code does
Light: Copied Strike	Frontal strike: 60% damage within 3.2 blocks.
Medium: Copied Weapon	Copies the item in your main hand into its own hand, then hits the area around you (70% damage, radius 3).
Signature: Gravity Flip	Gravity flip: Levitation III for 2 seconds to everyone within 16 blocks.
Final phase: It adopts your play style	Phase change only.

Pressure Leviathan

World 7 · 3027 health · 35.8 damage · sleeps in its lair, the sunken trench temple of World 7. It swims, never drowns and does not float up.

Attack (name shown on screen)	What the code does
Light: Tail Lash	Frontal strike: 60% damage within 3.2 blocks. Swims freely.
Medium: Charge	Charge (90% damage on impact) and -5 oxygen to every player within 20 blocks.
Signature: Abyssal Pull	Abyssal pull toward it from 18 blocks and -15 oxygen to every player within 20 blocks.
Final phase: Depth and oxygen worsen	Phase change only.

Master of Seasons

World 8 · 4086 health · 43 damage · summoned at the Arena Altar of World 8.

Attack (name shown on screen)	What the code does
Light: Seasonal Strike	Frontal strike: 60% damage within 3.2 blocks.
Medium: Seasonal Ground	Seasonal ground at the aimed spot: 70% damage within 4 blocks.
Signature: Season Shift	A season cloud of radius 7 (Poison, Slowness, Weakness or Wither, changing every 10 seconds) plus a ground shockwave of radius 8.
Final phase: Overlapping seasons	Phase change only.

Heart of the Terrain

World 9 · 5516 health · 51.6 damage · summoned at the Arena Altar of World 9.

Attack (name shown on screen)	What the code does
Light: Ground Wave	Frontal strike: 60% damage within 3.2 blocks.
Medium: Living Wall	Ground wave: a 13-block line toward you, 60% damage and a launch.
Signature: Chasm	Chasm at the aimed spot: 100% damage and Slowness V for 3 seconds within 4 blocks.
Final phase: The floor vanishes in sections	Phase change only.

The Unfinished

World 10 · 14894 health · 61.9 damage · summoned at the Arena Altar of World 10.

Attack (name shown on screen)	What the code does
Light: Shell Attack	Frontal strike: 60% damage within 3.2 blocks.
Medium: Shell Attack	The medium attack of the world its current shell copies.
Signature: Shell Attack	The signature attack of the world its current shell copies.
Final phase: A tiny final form	Ten shells: at 90%, 80% ... 10% of its health a shell breaks and it switches to the attacks of the next world, from World 1 up to World 9, always on the shortest timings.

Mutations

From World 6 on, the boss of a wild, hallowed or cursed world wakes mutated. The mutation adds to its fight without replacing it, and its name follows the boss's in the boss bar.

Mutation	Comes from	Effect
Echoing	Wild World 6 and 9	Every big attack is followed by a second shockwave a moment later
Frenzied	Wild World 7 and 10	Below half health it heals a little, then moves and attacks faster
Searing	Wild World 8	Its attacks set you on fire; a ring of flames follows every big attack
Radiant	Hallowed worlds	Every 15 seconds a pulse of light blinds, slows and outlines those around it
Hollow	Cursed worlds	Every 20 seconds two creatures of its world come out of its shell

A mutated boss drops one or two Mutated Scales and two more Shell Shards. See World variants and mutations.

The Artisan's Shadow (World 0)

9000 health, 55 damage. It waits in the Artisan's room in World 0, borrows the law of a different prison every fifteen seconds and cannot be finished: brought near death, it stitches itself back together. Its attacks are Unfinished Stroke, Borrowed Law and Ten Prisons at Once. The way to end the encounter is on the World 0 page.

How to meet each boss

Two ways: altar bosses are summoned at the arena altar with their offering, lair bosses sleep in their own lair and wake when you walk up to the lair heart. Arenas and lairs sit 160 blocks south of each world's Threshold.

Block Guardian (altar boss, The Guardian's Sanctuary)

1. Follow your Scroll's sketch to the Guardian's Sanctuary on the Surface.
2. Use the sanctuary altar: the Block Guardian rises. No offering needed.
3. Sneak while using the altar to fight it again.

Spore Queen (lair boss, The Hive)

1. Walk 160 blocks south of the Threshold to its lair gate.
2. Come within 10 blocks of the lair heart at the centre of the chamber.
3. It wakes after a three-second tremor. Beat it and the treasure alcove opens: three chests of the world's best loot.
4. The heart wakes again ten minutes later, for a second fight.

Ash Titan (lair boss, The Forge-Hall)

1. Walk 160 blocks south of the Threshold to its lair gate.
2. Come within 10 blocks of the lair heart at the centre of the chamber.
3. It wakes after a three-second tremor. Beat it and the treasure alcove opens: three chests of the world's best loot.
4. The heart wakes again ten minutes later, for a second fight.

Grand Jailer (altar boss, The arena altar)

1. Craft a Sealed Shackle at the Jailer's Table.
2. Walk 160 blocks south of the Threshold to the arena.
3. Hold the offering and use the altar on its dais: a three-second ritual summons the boss.
4. Every fight, the first and the next ones, costs one offering.

Offering: Sealed Shackle, made at the Jailer's Table from 6 Sealed Fragment, 1 Dungeon Key, 2 Iron Chain.

Storm King (altar boss, The arena altar)

1. Craft a Storm Censer at the Lightning Forge.
2. Walk 160 blocks south of the Threshold to the arena.
3. Hold the offering and use the altar on its dais: a three-second ritual summons the boss.
4. Every fight, the first and the next ones, costs one offering.

Offering: Storm Censer, made at the Lightning Forge from 4 Storm Essence, 2 Celestial Crystal, 2 Ray Membrane.

Light Eater (lair boss, The Lightless Pit)

1. Walk 160 blocks south of the Threshold to its lair gate.
2. Come within 10 blocks of the lair heart at the centre of the chamber.
3. It wakes after a three-second tremor. Beat it and the treasure alcove opens: three chests of the world's best loot.
4. The heart wakes again ten minutes later, for a second fight.

Your Double (lair boss, The Hall of Mirrors)

1. Walk 160 blocks south of the Threshold to its lair gate.
2. Come within 10 blocks of the lair heart at the centre of the chamber.
3. It wakes after a three-second tremor. Beat it and the treasure alcove opens: three chests of the world's best loot.
4. The heart wakes again ten minutes later, for a second fight.

Pressure Leviathan (lair boss, The Sunken Trench Temple)

1. Walk 160 blocks south of the Threshold to its lair gate.
2. Come within 10 blocks of the lair heart at the centre of the chamber.
3. It wakes after a three-second tremor. Beat it and the treasure alcove opens: three chests of the world's best loot.
4. The heart wakes again ten minutes later, for a second fight.

Master of Seasons (altar boss, The arena altar)

1. Craft a Wreath of Seasons at the Time Workshop.
2. Walk 160 blocks south of the Threshold to the arena.
3. Hold the offering and use the altar on its dais: a three-second ritual summons the boss.
4. Every fight, the first and the next ones, costs one offering.

Offering: Wreath of Seasons, made at the Time Workshop from 2 Season Fragment, 6 Temporal Sand, 1 Season Preserve.

Heart of the Terrain (lair boss, The Living Cavern)

1. Walk 160 blocks south of the Threshold to its lair gate.
2. Come within 10 blocks of the lair heart at the centre of the chamber.
3. It wakes after a three-second tremor. Beat it and the treasure alcove opens: three chests of the world's best loot.
4. The heart wakes again ten minutes later, for a second fight.

The Unfinished (altar boss, The arena altar)

1. Craft a Unfinished Effigy at the Final Loom.
2. Walk 160 blocks south of the Threshold to the arena.
3. Hold the offering and use the altar on its dais: a three-second ritual summons the boss.
4. Every fight, the first and the next ones, costs one offering.

Offering: Unfinished Effigy, made at the Final Loom from 6 Artisan's Thread, 1 Artisan's Shard, 4 Wool Thread.