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

Beady Eye Stalk

NPC	Level	Zone	Chance
Tide Crawler	12 - 14	Darkshore	19.0%
Sea Crawler	15 - 16	Westfall	15.1%
Young Reef Crawler	10 - 11	Darkshore	11.5%
Pygmy Tide Crawler	9 - 10	Darkshore	8.99%