Help! with theDemon Knights in the underdark entrance

Well, I've got back into the underdark and I know I cant get back to spellhold without cheating..damn. But I went to the kua-toa lair and there's this room where you sacrifice a creature and you free lots of scummy demon knights. I just can't take all 6, on if I cast any spells on myself they're removed at the start of the battle and they hurt. My people are quite a high level and I also have good equipment and spells yet can't get through them all.
I've got:
Me, paladin around lvl 14-15
Anomen lvl 18
Minsc lvl 16 or so
Aerie lvl 14 or something
Imoen lvl 18 or higher
and Mazzy lvl 14 or something

I have got good items like carsomyr+5 and that kind of stuff. But they hurt so much!
Please Help!!

[masteraleph]

The trick is not to take them all on at once. Keep everyone but one character (preferably one with haste/boots of speed/oil of speed) out of the room, and bring that one character in with the sacrifice. Get him just close enough to reveal some of the altar, then move the sacrifice on and run out of the room. You may have one (or maybe 2) knights chase you, you can whack 'em outside of the room. Then sucker them out 1 at a time, saving after each (you don't want to get through 5 and then die to the last one!)

[Father Bronze]

I backed myself into a corner. You'll notice that the summoned creatures get waxed rather quickly. I summoned more to block the advancing knights. I basically teamed two characters against one knight and two against another, had one character summoning creatures, and the other trying to slow down any knight that avoided the creatures (this last one with a very low AC and stocked with lots of healing potions).

Once the first knight fell, I moved on to the next and so on. I'm pretty sure I resurrected a character or two, but the battle went fairly smoothly.