This addon was uploaded for my boyfriend, whose favorite character was/is Illidan.
This Addon plays Illidan's "Return to the Shadows!" upon using Vanish.
It is set to play with Master sound, so it will still fire and be heard, even if you keep your "Sounds" turned off in game, as I do. As long as your "Master Sound" is set high enough, it will still be loud enough to hear.
I am also working on a couple other projects at the moment, murloc and otherwise.