BetterWitherDrop

When a Wither boss is defeated, the datapack changes the chances of Wither skeleton skulls dropping. Per the author's table, 0 skulls rises from 42.25% to 36%, 1 skull from 45.5% to 48%, and 2 skulls from 12.25% to 16%. Three skulls are not produced by the datapack. Without the Looting enchantment, a Wither skeleton skull drops at about 2.5%, which the author rounds to a low base rate. The values were calculated with an AI model from the base loot table, and the author notes that the 1.20.x builds were not tested.

The mod is a datapack, so it is installed in a world's datapacks folder rather than as a mod jar. It is published for Fabric, Forge, NeoForge and Quilt, plus the data pack platform, across 24 release versions, 1.20 – 26.3. Because the environment is server required and client optional, the server must run it, and players can join without installing anything. The code is open source under the MIT License, and the author has marked the warning about outdated datapacks to be skipped.