Tried everything I can think of here.. The lich itself isn't really that much of a problem, the skeleton lords, however, are simply just too much for my front-liners. They are tearing my tanks to pieces within seconds. I don't really understand just wth is going on, I've dealt with other skeleton Lords before, and they weren't too much of a problem (the planar sphere demon fight amongst others).
My party is (all lvl 13-14):
Vagrant
Berserker
Anomen
Valygar
Nalia
Imoen
Heck, I've even tried resorting to some cheesier tactics, bottlenecking the Skeleton Lords in the corridors back towards the crystal area, but I still only seem to be able to get one of them down - at most - before my melee guys start dropping like flies.
Any help would be greatly appreciated as I'd hate to have to end up resorting to lowering the difficulty.