[Nerfix]

Magic Resistance doesn't work on nearly all spells BTW. It works only against those "Magic resistance negates" spells.

Magic Duel has a great distance so the two Astral mages don't need to be next to each other. It needs to be scripted as far as I know. The Astral Mage with higher Astral most likely wins, but I think that the Dominions Random Number gives a fleetingly small chance that the duel results in a tie which means both mages die. Not sure.

Misform is a very good spell but Ethereal/Lucky combo is hard to beat. I forgot what level Personal Luck is though. You can get Luck easily from Lucky Pendant, a 2 Cons 1 Astral trinket.

Chaimail of Displacement gives just a defence bonus.