If i Had to choose out of any powers, it'd be the ability to alter atomic structure. It'd be funny, Because i could make someone radioactive by giving them some more neutrons LOL.
what i did was chain dustias in the westersand and get loads of exp. you can chain the nam-yenesas and they give good xp, just be caferul to not get followed by too many of them or you can say hi to the game over screen...