Class system with skill selection, hmm? Now that sounds interesting. (... but knowing me and my ultra-greeding behavior, I might end up staying on Fool until I hit the level cap lol).
"Soul" is an interesting way to describe it ... is it just a cool way of saying basically personality aspect, or is this related to the graveyard and the whole "I was you, I will become you" thing?
Action crystals seem like a much more flexible system, very nice.
Gotta see things in action before making judgement, but this seems really promising! Can't wait!