Magic Reflex

Did you try against two enemies that had differing magic resistance?
I think I read recently its half atk and half mag

kotetsu deals hybrid damage, not physical or magic. i actually don't really understand about hybrid type attack since i don't have gilg, but since it can activate magic reflex then maybe it is treated as magic attack in some way.

hybrid means just that, kotet receives buff from both atk and equipment mag, that includes both man eater up. but also suffer from both debuffs, in this case BOTH atk reflex and mag reflex, atk guard and mag guard.