I have heard many people wanting to create their own spells. I think this would be a wonderful idea. You can choose something different for your school. 2 choices. Like for life maybe one that heals a large amount (1500+) and maybe even puts a -90% next incoming attack tower shield on you. Or a DoT spell.
as I mentioned in another post I think adding a quest line to the school spell would be good. Also make it something that is balanced of course.
I like choices, this would also add a different individuality to the game.
Maybe even add a quest line to go one way or another in our school. Like Fire for example could have a quest line for (insert title here) to learn to be more offensive or a quest line for (insert title) to be more defensive. Add like 3 spells for the entire training quest line for whatever path you choose.