Ice elementals in Watcher's Keep

[cair]

I do what I can but I can't make any damage to any creature in ice laboratory in second level of Watcher's Keep dungeon. I tried sharp weapons, blunt weapons, any type of magic, I looked for hints and walkthroughs, but I didn't make any damage, nothing functions. Spells absolutly don't work, weapons are ineffective. What should I do to kill that Ice golem and his mists?

[Sabre]

Have you blown the poison mist from the Poison room into the Ice room?

[cair]

I tried, but the cloud atways explode in slime laboratory. Never flies out of the room...

[Arcane]

go into the fire room, kill everything, find the ghost imp, talk to him, learn about the air generator, open it, fight off trhe greater air elementals, get the staff, open everything between the poison and the air room(get the staff of slime from the great snake) then open all the doors from the slime to the ice chamber then switch the fan of air again and blow the poison into the ice room, which should make the snowmen vulnerable.

then kill em