[@Hael]

The thing is that illusion is sort of split between two categories (Telepaths can make you hallucinate, yet Alterists could physically change the appearance of the item and disguise it as something else, so that you aren't hallucinating at all). I'd also say the traditional Illusion-type powers of invisibility and such fit under Alteration, further meaning that Telepathy isn't just the same thing as illusion magic. So illusion as a combination of the two and a category of its own would be overkill, but pretty powerful.

You mention that enchanting exists and is a basic skill, but I'd argue that it should be something of its own category because it doesn't fall under any others. When I mentioned enchanting I should have been more specific: I was thinking something along the lines of enchanters from Dominions 4, one of my favorite games. They are actually quite powerful even in combat, with the ability to enchant the land itself to make the arrows of friendly archers light up with magical flames and incinerate anything they hit, for example. Or just empower everyone nearby. Really they act as more of a support role, which is why I figure enchanting and construction would be a secondary skill that someone would take rather than their primary/only one.

And I just came up with those ideas because you seemed interested in adding more schools. If you like I could elaborate further on those ideas or help you brainstorm more, but I'm not going to take the initiative or push for any of this to be implemented. I'll be blunt and just say that since I have no intention of making a second character after Crompter, whether or not we add new types of magic doesn't really matter to me.