Cast the Invulnerability wizard spell (I can not remember the exact name of the spell, this is the one protecting for all damages, but the caracter can not perform any attacks). Cast this spell on one of your guys, and move him forward to the room where Mavalon is. All ennemies in the room will only concentrate on him. You then just need to cast all your fireballs to get rid of the Hulks, all your acid spells to damage the iron golems. Once the invulnerability is off, just finish the golems with your fighters.
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