You refuse to acknowledge how dumpster fire trash this quest is. Fix it.
Make it damage based not spell based. Force 35 spell damage to complete the quest as a whole. 10/10/15.
As a hunter, that is still very easy to complete but it will prevent them from literally doing 15 damage to face, complete it then doing the rest in one turn.
I am going to start asking you for a wage because you clearly need the help to design your game.