[@Raijinslayer]

Mutations generally are mainly looks. But now that you say it, I will allow for some slight benefits. A mutation would take up a skillslot in that case. And the less human, the more of a outsider you are. Human interaction grows more difficult. Also, the mutations are really minor still in terms of usefullness. No regeneration or anything like that. 

 Addiction to crystals is really, really dangerous. You get hooked to the power, you are unable to stop yourself. You draw in so much power at once, that you are liable to explode or turn into a icicle or whatever crystal you are abusing at the time.

Basicly, you feel like a god, then you feel like a pile of ashes...

[@Rockette] AA should be your focus in that case. Albeit if you find the time...