This I drew ages ago using a tablet (which I don't use much now), although I did the circles and separation lines on paper with a compass and ruler. It's a bit complex to explain this, but I had the idea of some people being born with one or more "Spirit Guardians" that would live within them, and when they were old enough, they could learn to summon these spirits in order to fight (so basically it's like a sorcerer/sorceress but with "preset" spirits whse strength grows with the owner). There are nine total different spirits, each representing a physical element in nature as shown in the overall seal here. The elements are (going clockwise) Earth, Ice, Lightning, Air, Light, Dark, Fire, Water, and Forest (plant stuff). Also, based on which of the spirits is the owners' "primary spirit" (the leader of the group) that person would be able to use the prime element and directly related elements without any summoning neccessary (e.g If the prime is Fire, then you could use that and Lightning without summoning). The exception to this is Light and Dark, which allows the free use of all available elements. Finally, the prime spirit is also the elemnt which powers the strength of the others.

ANNNDDD thats's it! Sorry for the long-winded explaination, just didn't want to get anyone confused. I have another version of this seal, which I'll post later.