BTW, all you need in the fight with the metamorph is a single stack of black knights, stone skin, magic spring and Eviln. 200 of your knights (even as a mage) will own 5000 of his
Get to the edge of the arena where only 2 enemy units can hack at you, kill them, port away so that you always have 2 fresh corpses for eviln, get to another edge of the arena, kill some more, use magic spring and calm rage to recover mana and the metamorph goes down easily.