Speak to Strahad Farsan in Ratchet.
Ah, good, you're here. I sent a $g succubus:infernal; after you to get your attention, but it seems you were able to get here before it found you. No matter.
There has been some talk lately of your growing power--that is good for you, possibly bad for others. But those are irrelevant points. The point is, I feel you've proven yourself and therefore are deserving of... hehe... a blessing of sorts.
Above Ratchet in the Barrens you'll find a man named Strahad. I believe you've crossed paths before.
This quest starts at Ironforge and ends at The Barrens