Guys help me join the lore

So I was wanting to make a character with magic (yiga themed ofc) but unlike any magic that anyone's seen. It's not like super overpowered or anything (especially since I haven't gotten it down) but I just wanna know if there's anyone out there willing to help me make a whole new magic system. And while their at it perhaps maybe summarize how the civil war went? I disappeared for 5 months sry.

Oh, I have no life