I've met with Disciple Zhazsze, a particularly devout follower of Cazic-Thule. She has informed me that I have work to do in the name of the Faceless, and has sent me to bring back the heads of ashblaze drakes from Wurmscale Barrens. Whether or not I'm actually being commanded by Cazic-Thule is irrelevant - if I am to remain in good standing with the locals here, I'll likely need to follow along with her instructions.