Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Ghoul Rib

NPC	Level	Zone	Chance
Flesh Eater	24 - 25	Duskwood	80.0%
Bone Chewer	26 - 27	Duskwood	80.0%
Brain Eater	28 - 29	Duskwood	80.0%
Plague Spreader	27 - 28	Duskwood	80.0%
Rotted One	25 - 26	Duskwood	80.0%