I would change the Death spell Doom And Gloom. It's the one that puts a dome around the battle area. The Fire and Storm spells gives a 25% increase to all the power and heartbreak spells from their respective schools, but the Death spell reduces all healing spells by 50%. Which would be fine, BUT:
1. most of the enemies never use healing spells
2. It also reduces the healing spells that the player uses
As far as point #2, I understand that with the Fire and Storm spells, they give a boost to the spells cast by the enemies also, so there is a downside for the player anytime they use the spell, but because of point #1, I never use the Death spell. I understand that KI was trying to make the different school spells unique, but this one kind of fell a little short in my opinion. I know I should suggest how they can change it to still make the spell unique but a little more user friendly for the player, but I haven't had my coffee yet this morning so I'm not feeling very creative.