Should just make it a full area based party buff and debuff, it's not even busted. Still miss with the buff and enemies can still dodge with the debuff unlike the unavoidable dmg crap XD. I mean on one side they have some insanely unbalanced gimmicky stuff and on the other they thought implementing the spell like this is balanced. Maybe if the game actually played like D&D.
Thats not how the spells works though. You can pick a number of targets depending on the level of the spell. But you can PICK. Its not an aoe spell.
