Speak to Durak in Splintertree Mines.
The demons want nothing more than for us to renew our dependence on their foul magics. That reliance can only lead to the entire orc race becoming enslaved.
You wish to see Draaka go unpunished? Then you must find the demons' pawn who has manipulated her, and destroy him!
If you do not soon return to me with the head of this being, then I shall see both yours and Draaka's hoisted upon a spike!