The Better Withered Mobs mod adds Withered Bones, Withered Bone Meal, Withered Bone Blocks, a Potion of Decay, and a Withering enchantment. These are the crafting recipes the mod adds:
Withered Bone Meal only works on Warped Nylium and Crimson Nylium. These are the drop chances for the Withered Bone Meal:
1. 3/11 drop chance for warped and crimson fungus.
2. 2/11 drop chance for brown and red mushrooms.
3. 1/11 drop chance for a wither rose.
The mod is also very configurable:
Wither Skeletons spawn with swords with the Withering enchantment by default, this can be disabled.
Wither Skeletons only drop Withered Bones by default, this can be disabled to have them also drop regular bones.
The Withering enchantment can be applied to axes and tridents by default, this can be disabled.
The maximum level for the Withering enchantment is 5 by default, this can be increased or decreased.
By default, every level of the Withering enchantment increases the withering duration on the hit mob by 3 seconds and increases the amplifier by 1. 20 ticks is 1 second so the default value of 60 is 3 seconds. The tick multiplier is multiplied by the enchantment level. So for example, Withering 5 lasts 15 seconds.