Hopefully you won't have to experience it, but I reckon you'll find out if you die. If you'll be unable to accept your death and move on to the afterlife, be it because people left behind rely on you or other unfinished business, then you'll have to figure out what to do, continue to exist as a ghost or seek help from a necromancer.

[If only he knew...]

I'm not sure how many light mages we've got in total, but I know a few. Maybe you've met some of them too? Junko, Ereshkigal, Maribelle, Gokudera... those are the ones I know.

[He missed out on a whole lot of light mages, including some he knows but whose magic types he lacks awareness of. Perhaps they could use a census!]