Greetings
First, since Treamayne's gonna want to know, what of the Cosmere have you read?
Second, what's your favorite Cosmere weapon or offensive magic system?
Third, do not accept the cookie
Possible idea: one magic system (maybe based from one of the gods? Or another set of gods) where it is based solely upon the wielder's morality; they may perform almost any action they feel to be right
Second idea: magic requires balance, possibly retributive god. Magic automatically reacts to harm, correcting balance