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

Stone Arrowhead

NPC	Level	Zone	Chance
Corrupted Bloodtalon Scythemaw	10 - 11	Durotar	72.3%
Bloodtalon Taillasher	6 - 8	Durotar	69.3%
Bloodtalon Scythemaw	8 - 10	Durotar	67.5%