[quote=Geoffrey Silt]
I would say twenty element crystals *or more* because death isn't an element and sounds OP.Fire element is my choice.Beginning skills: Basic pyromancy: Can boil water, can make extremely small flames, can melt plastic if concentrating hard enough.Beginning mutation: Hot skin: His body is about as warm as metal that has been in a stove for three hours.
[/quote]

I have my ideas for basic skills, I think I know how I'll do those. Your idea for hot skin was one I thought of too, though, and it will probably be one of the available mutations for fire. 

As for the crystals it won't be a set number. 

At the moment, what I'm thinking is one crystal is worth a certain level skill/mutation. Say you're an earth elemental, and you use a fire crystal. Your element and the crystals element would combine to allow you to choose a lava element skill. If you manage to obtain equal amounts of skills in both your native element and another element or more skills in another element than you have in your own you have the option of becoming the element you're on par with or have more skills in.