[andrewas]

ON the master wraith - open up with a sunray or two - this should destroy a fair few wraiths. Watch out for the vampiric wraiths - they can level drain you. Im sure something else there can level drain as well.

A pair of decent tanks ought to be able to go through them in a few round though. Greater Whirlwind is probably the way to go with that. Priest turning undead may be worth trying, shadows and wraiths are effecte by that as I recall.