How do you design your magic?

[DerVVulfman]

I may need to confer with my sis in regards to our joint project, but I think this is how it's going to be:

Player characters have an 'innate' magic system that is controlled by a Magic tree. They train or decide what they get to use as they advance their skills. Old ones disappear as the newer and more powerful ones take precedent. So if you had a fire skill and advance, it could become firewind or fireball. Different abilities or whatnot are your choice as you go along.

Other skills may be actively learned but are not dependent on leveling. Things like training parlors, Spellbooks or whatnot.

I don't think too much power should be invested into a skill as the player's own level and stats should do enough. Don't want to make it TOO easy for the player, eh?