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

Worgen Skull

NPC	Level	Zone	Chance
Nightbane Dark Runner	28 - 29	Duskwood	80.0%
Nightbane Tainted One	30 - 31	Duskwood	80.0%
Gutspill	32	Duskwood	80.0%