whoa, class features become feats! that's cool! Loved the smite feats
Links for Races and Classes are 404, btw.
Why don't you just use the Pathfinder rules for character creation, then give every character an oracle mystery and element domain?
The mystery and domain spells become spell-like abilities that can be used 1/day at 1st level, 2/day at 3rd level, and so on.
Then make two deities, one for Yin and one for Yang. this would determine the character's energy affinity, e.g. a character worshiping Yin deity would be healed by Yin energy and harmed by Yang energy.