Enter The Forge of Souls from the side of Icecrown Citadel and find Lady Jaina Proudmoore.
<Class>! Come close quickly, I must have a word!
My patron, the Lady Jaina Proudmoore, 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 any help that I could... and, well, I was hoping that might be you.
Please, find her there as soon as you can.