Monks would use basic attacks, be able to use Dex instead of Str, and would have 12 zodiac animal stances. You'd know, like, 2 stances at 1st level, and could pick up another stance every 5 levels. Each stance would modify your basic attack and give you access to a special move action.
Ardents would, again, use basic attacks, and they'd have mantles, similar to bardic music auras. And special psychic attacks.