[el_kalkylus]

Okey, I finally beat them with this party on insane difficulty. It was not easy, and this tactic is not fullproof, but it worked 2 times out of 3.

Here is my party again:
Sligyn - Berserker/mage- level 9/12 - equipped with Lilarcor and elven bow.
Jill - Kensai/mage - level 9/12 - equipped with Dakon's Zerth blade, Celestial fury, robe of vecna, ring of gaxx, cloak of sewers, and boot of speeds.
Devarabiel - elven fighter/thief - level 10/11 - equipped with flame tounge, cloak of none detection, and some thief-equipment.
Lovyan - ranger/cleric- level 9/11 - equipped with mace of disruption(the improved one, shield of balduran, ring of gaxx, ring of earth elementals (ac -12)

To be able to beat the guys in the twisted rune, I had to prepare myself very carefully. I let Jill and Sligyn throw some stoneskins on themselves, and a little other protections. Devarabiel set two traps where the lich would be (the third trap failed), and Lovyan casted protection from evil 10radius, true seeing and 2 glyph wards to the place where Vaxall (eye-monster) would be. Sligyn hasted everybody, and Jill casted improved invisibility on Devarabiel. Now the fight begins.

Devarabiel had to stay put so that he could backstab the lich (Shangular), while Jill an Sligyn ran away to the right corner. I placed Lovyan in the middle, so that she could detect illusions, and use her shield of balduran against Vaxall. Quickly, I let Sligyn cast Death fog to the place where the mage (with the staff of magi) would be, and let Jill cast ice storm. After that I shouldn't have to worry about the mage anymore, because she would then have a lot of casting failures. The big problem was the vampire (Shyrissa). If I was lucky, no one would be dominated (didn't have any slots left for chaotic command), but she could still level drain your party members. Jill and Sligyn had to take care of Shyrissa, and they had to retreat to the corner, so that Vaxall wouldn't disturb them. When Shyrissa is dead, then Vaxall, the mage, Revanek (the thief), and Shangalar is still left. The mage sometimes manages to cast a spell (meteor storm or mace), and Shangalar cast all kinds of spells, if he is not dead already. Vaxall, can kill you if you miss a saving throw, so this tactic isn't exactly fullproof.

I played with this tactic 3 times, and I killed them all 2 times out of 3. The first time, everybody survived unharmed, the second time they were helpless, and the third time, Devaberiel died while the others survived.