This quest is not available in game.
Visit the Fire Festival camps located in Blasted Lands, Eastern Plaguelands, the Hinterlands and Searing Gorge, then speak with the Festival Flamekeeper.
Our celebration of the flame is spread throughout the land, <class>. Not a single place remains untouched by the heat of this holiday, and the strongest fires burn a brilliant blue. Seek them out.
You'll find one just north of Blackrock Spire. The others are located deep within the Eastern Plaguelands near a decrepit town, along the road to the cliffs within the mountainous Hinterlands, and on the way to the Dark Portal within the Blasted Lands.
Return once your journey is done.