Magic Detection: Kain's current form was a transformation effect in his previous game by a goddess; some of his innate abilities and all are a supernatural effect because of that, so he's probably a bit of a Christmas tree. He has fire magic as part of the transformation, which includes a higher than normal body temperature and an ability to jack that up ridiculously as well as some active-use and fire-breathing.

At some future date he might try to regain holy magic he had in canon; if he does get it back I'll note it on his info post.