Enter The Forge of Souls from the side of Icecrown Citadel and locate Lady Sylvanas Windrunner.
<class>! Come close quickly, I must have a word!
My queen, the Lady Sylvanas Windrunner, has uncovered a hole in the defenses of Icecrown Citadel into a place she referred to as "The Forge of Souls." She sent word before she left for me to find fierce fighters to send her way. I think you'll do.
Go to her within the entrance to the forge, <class>.