A Warrior hero from the Dungeon faction? That's absurd...

In principle, I agree that you can choose any other school of magic. Lately, I've been enjoying light magic as an option. It provides speed, regeneration, and a punishing strike, all of which are very useful for a high-initiative Tribes of the East army. And if you have Divine Retribution, it's simply amazing.
But still, I don't want to lose the advantage of chaos magic in the hands of a Warlock due to its impenetrable magic, chains, and arcane wave.