Compatibility

Compatibility

Applies to Mystical Realms Data-Pack 1.0.0-beta.6 for Minecraft 1.21.1 (pack format 48).

Minecraft version

Pack format	48
Minecraft	1.21.1 only
Works on 1.20.x and earlier	No
Tested on 1.21.2 or newer	No

The pack uses the 1.21 folder layout — singular recipe/, advancement/, loot_table/ — which does not exist before 1.21. On a newer Minecraft the pack will simply be reported as incompatible.

Loader

The pack format is plain vanilla, so no loader is required. However, 30 of the 43 files rely on NeoForge's neoforge:false condition to discard a stub:

• the 26 Cataclysm Spellbooks recipe stubs
• the 1 Just Enough Breeding recipe stub
• the 3 Reliquary recipe stubs

On a non-NeoForge loader those 30 fixes will not apply. The other 13 files — the loot tables, biome tags, the advancement, and the two guidebooks — use no loader-specific syntax and work anywhere.

The project's own listing names NeoForge 21.1+ as informative, not as a requirement.

Mods this pack is useful with

The pack is safe to install unconditionally, but each fix only matters when its mod is present:

Mod	Fixes that apply
Cataclysm Spellbooks	the 26 recipes
Just Enough Breeding	the breeding recipe
Farmer's Delight Pizza Lovers	the advancement
IDAS – Integrated Dungeons and Structures	the 5 loot tables, 3 biome tags and 1 spawner
Illager Structures	the monastery
Butchery	the guidebook title
Iron's Spellbooks	the guidebook title
Reliquary	the 3 uncrafting recipes

And one mod is a consumer rather than a target:

Mod	Why
Equivalent Legacy (or Equivalent EMC)	Not patched. It is what produces the EMC exploit warning in the first place, so its presence is what makes the Reliquary fix visible.

Multiplayer and servers

This is a server-side datapack. Install it on the server and every client sees the result — the fixes change data, not visuals, so there is nothing for clients to install.

Configuration

None. There is no config file and no in-game setting.

Commands and function files

The pack ships no function files, no scoreboards and no predicates. The only thing it uses is:

• /reload — to apply the pack after installing it without reloading the world.

For pack authors

The pack is built by two scripts in the source repository:

• generate_fixes.py regenerates all 43 data files from scratch. It can take a path to the IDAS jar so it can curate the loot tables from the real data; without the jar it writes empty-but-valid tables instead, which means IDAS chests lose all their loot.
• build_fix_pack.py validates every JSON file and zips datapack/ into Mystical_Realms_Data_Pack-<version>.zip, taking the version from version.txt.