is this a power or a quirk or (animal rp question)

so i have a character who i'm interested in giving necromancy as a hobby or power/quirk. i just don't know whether there's a way i can use an existing power as that or if it's just something i can have (since it won't be a willy-nilly thing she can do whenever, it'll be an occasional Lengthy Process and the rest will just be basically akin to dark magic - curses and such.)

this feels a little complicated oof