I feel like the four elements should really be fire, electricity, metal and wind. Although irrigation / water was biggie too. Those are the things that powered most human progress... along with language, projectiles (kinetic -- see the baseball monkey thing) and textiles (which is just different enough that I'd want to have someone subverting the magic stuff with weaving / cloth / nets / clothes somehow ...) Maybe axes? Like weaving vs directing vs throwing vs creating? And it's easier or harder to do each with the different elements (water fire metal fiber) This could come into play once a particular area gets "big" enough to start allowing magic to grow. Remember: [[there are no mages in the void]]