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

Plans: Persuader

NPC	Level	Zone	Chance
Azuregos Boss	??	Azshara	1.32%
Onyxia Boss	??	Onyxia's Lair	1.32%
Ragnaros Boss	??		1.32%
Nefarian Boss	??		0.001%
Ysondre Boss	??	The Hinterlands	0.001%
Lethon Boss	??	Feralas	0.001%
Emeriss Boss	??	Duskwood	0.001%
Taerar Boss	??	Ashenvale	0.001%