when i played a detsro mage, all i ever had to do was cast a weak duel casted spell, and the target couldnt do anything, wiethert it was Vs a mouse or a giant, a goat or a dragon, and with enough mana and mana regen, i would enevr go oom as i could just sit there for a heartbeat while they are still staggered, then recast before they could do anything, and they would still be stunned indefanatly, while i got my mana back
i think the stun aspect should be removed, and in return a damage modifier boost for duel casting added to it instead