Tactics for Conflux.

There are useful spells in all schools, so there's no need to learn them all just for that.

Juristis, lately I've been learning every spell I can. Right now, I'm taking advantage of having captured the Conflux and bringing all my secondary heroes there (the two strongest already have all their secondary skills filled): it's better to have a school of magic than Mysticism, Enchantment, or some other random useless skill imposed by the game.