[Mourn Yauntyyr]

First of all, see my comments about dealing with level drain in katmay's Level Drain topic.

Second, cast every enhancement spell you can. Haste, armor of faith, protection from evil 10', ironskin, stoneskin, chaotic commands, chant, invisibility, are all musts. Mirror image, blade barrier, blur, strength are nice. Summon elementals and aerial servants. Have them at the front while you pound the vampires from a distance. If you have that mace of disruption, use it. Have a single healer back to take care of anyone who gets seriously hurt. If you have Minsc, make sure he is getting a lot of swings as his racial enemy is vampires and he will hurt them real bad.

Btw, dig the name. I'm a big Mongol fan myself.