Succubus Wings

Go one map north of Rachel, to the Demon Hunter NPC.

http://img689.imageshack.us/img689/3112/67482760.jpg

He will then want all of these items:

http://img259.imageshack.us/img259/4692/43203812.jpg

And then, you get your wings!

http://img694.imageshack.us/img694/9858/15031905.jpg