Mystical Realms Data-Pack

Mystical Realms Data-Pack is a server-side datapack for Minecraft 1.21.1 (NeoForge 21.1+, pack format 48) that patches broken content shipped by third-party mods — content that errors because an optional dependency is missing (Ice and Fire, BYG) or because the mod’s own data is malformed.

Built from the errors observed in the Develop Mystical Realms instance run of 2026-09-01.

Fixes Included

• cataclysm_spellbooks — 26 recipes referencing unregistered items replaced with neoforge:false stubs
• justenoughbreeding — malformed breeding recipe stubbed
• farmer_delight_pizza_lovers — malformed advancement rebuilt as hidden recipe-unlock
• IDAS (Ice and Fire) — loot tables, biome tags, structure spawners fixed
• illagerstructures — corrupt monastery structure disabled via biome tag
• butchery / irons_spellbooks — Patchouli guidebook title/landing page translated to Spanish
• reliquary — 3 EMC exploit uncrafting recipes disabled

Not Fixable from a Datapack

• runes:*_altar category NPE in the recipe book — a bug inside runes.
• supplementaries:sign_post_jungle / hanging_sign_jungle “invalid item” — stale block-entity data in already-generated chunks; heals on re-save.
• spell_engine:handheld tag missing references — overwriting a mod’s own functional tag is unsafe; left as-is.
• Cosmetic third-party model / texture / sound gaps.