CraftMobLootZ is a mod made to be used together with other mods, specifically with BadMobs by removing everything except the zombies, it adds ways to get the objects dropped by the other mobs that are no longer there.
Mods that I recommend using:
BadMobs
https://www.curseforge.com/minecraft/mc-mods/bad-mobs
FirstAid
https://www.curseforge.com/minecraft/mc-mods/first-aid
Mod made with Mcreator