[lvalero]

In my campign we have a simmilar system. All wizard spells are ranked from level 0 to level 6. All spells belongs to a college. If you want to study a new spell from a given college.

- you must know at least two different spells from each previous level.
- at least ONE spell of each previous level must be of the same college.

Exceptions: ZERO-level spells have not prerequisites. Metamagic college spells have double prerequisites.

(Sorcerers in my campaign dont have any prerequisites but they have to buy exception prerequiste Perks to buy additional spells)