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

Bloodshot Spider Eye

NPC	Level	Zone	Chance
Carrion Vulture	50 - 52	Western Plaguelands	20.0%
Venom Mist Lurker	50 - 51	Western Plaguelands	20.0%
Rotting Condor	53 - 55		2.00%
Plaguewing Vulture	56 - 58		2.00%
Carrion Lurker	52 - 53	Western Plaguelands	2.00%
Plague Lurker	54 - 55	Western Plaguelands	2.00%