Now hear me out. In the show proper, when two members of blue rose or w/e die they suffered from loss of level. The same happened to zaryusu and all the others. Similar effects happen later to a colisseum champion, a big troll of some kind.

It is also a rarity in itself to have the spell at all, as its mid tier magic. I fancy myself something of an experienced player with a character that should fit any requirements as a holy being (Him being a divine being and all) so I'm merely asking, if not true ressurection or the one needed for shalltear which required the body to be remade entirely (thus the gold cost), what skill woulf you feel comfortable with giving a player that doesn't breach your rule. 

As I mentioned, would a stasis ability that prevents death/actions be an alternative? Obviously with certain requirements to use the skill so as to not abuse its invincibility status mid fight.