This quest is not available in game.
Bring Venya Marthand 3 Rattlecage Skulls.
Greetings, child. I can see that you are still young in the ways of the warlock, power still eluding your grasp. I can sense your eagerness to learn.
And you will learn.
There is no strength in ignorance. Knowledge is our greatest power. Through its application, we can control the chaotic magics and beings of the void, bending them to our will.
I will show you how to bind a servant to your will, but first you must bring me three skulls of the rattlecage skeletons near the abandoned smithy.