knights are not supposed to deal damage. Use ssa, mightrings or magma amulet and on each turn heal great hp and exura ico (both possible during 1 turn) even if you have full hp. Dont use utito. Dont waste ur mana in atk spells. You only risk dying because youd dont focus on healing anymore. The mages and pallies deal more damage and its their part of the quest to do so.