The spread is good, but the skill tree will be messed up.

Added 9 minutes ago
Why should the spell that destroys armor be in the air? If it's just because of the word "beam," the name and visuals can be easily changed. Removing enchantments can be implemented anywhere (except maybe on the ground). Swords can be turned into a thorny bush.

Destructive beam lowers defense while stone skin increases defense – the spells have opposite effects (although they are not a pair of spells that cancel each other out, like speed and slow). Hence, the idea is to distribute these two spells into opposite elements, and if stone skin is earth, then the destructive beam goes into the air (it was like that in Heroes 3). Removing enchantments corresponds to water – it's like washing away dirt:D

Added 5 minutes ago
In general, I adhere to Nargott's option, but of course, the skill tree will turn into something...