The Undead caves in Cresent Reach like you are heading to Blightfire moors. Loc 453.61, -110.82. If you look at map is will show a river and one of Lize's chest, just past that is a bridge cross that and go int to the caves. It is in the back of the romm on the Left. You will need invis to undead just so you can sneak in with out a hassle.
Edited, Oct 10th 2006 at 12:39pm PDT by pinkysbliss