Yes the twisted rune is one of the coolest fights in the game. Took me two tries to beat and my characters were 3 levels from being maxed out. Here's how I did it. Power up all your characters with priest defense spells. Bless, Chant, defensive harmony, true sight, etc. Have your true sight character go in the room, and backstab the female mage. (She's the one with timestop, and can cast wail of the banshee.) Once she's down you can kill everyone else at your leisure. (Shangelar doesn't have timestop for some reason.) Oh yes the staff of the magi is cool. Who likes a lightning bolt fireball combo? And don't forget about spell trap!
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Everyone is entitled to their own opinion, I just don't have to listen.