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

Larval Acid

NPC	Level	Zone	Chance
Silicate Feeder	55	Ruins of Ahn'Qiraj	15.0%
Carrion Devourer	56 - 57	Eastern Plaguelands	7.80%
Carrion Grub	54 - 55	Eastern Plaguelands	4.71%