ISA 01 - Arcane Boss Essences V4.1 - Occultism Compatibility Fix
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WHY THIS HOTFIX EXISTS
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The previous version used NeoForge Global Loot Modifiers (GLMs) to inject
essences into boss loot tables.

Mods that replay or simulate entity loot tables (for example Occultism's
Shattered Soul Shard mechanics) can interact badly with loot-table modifiers.

V4.1 no longer uses boss loot tables at all.

NEW SYSTEM
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Each boss essence is awarded through a hidden advancement using:

    minecraft:player_killed_entity

The advancement requires the exact boss entity type.
Its reward function:
  1. gives exactly 1 matching ISA essence to the killer,
  2. displays a short confirmation message,
  3. revokes itself so the boss can reward an essence again on the next kill.

RESULT
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- Opening Occultism soul shards cannot generate ISA boss essences.
- Chests / stones / loot-table rerolls cannot generate ISA boss essences.
- Only an actual player-credited boss kill awards the essence.
- One matching essence is awarded per credited boss kill.

INSTALL
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Replace the old ISA_01_Arcane_Boss_Essences.zip with this file.
A /reload should be enough for datapack changes, but a full server restart is
recommended when updating a modpack release.
