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

Smoldering Embers

NPC	Level	Zone	Chance
Rogue Flame Spirit	23 - 24	Stonetalon Mountains	7.00%
Burning Ravager	24 - 25	Stonetalon Mountains	7.00%
Burning Destroyer	26 - 27	Stonetalon Mountains	7.00%