[@Ashifili] I guess you can call Rui "Death" and Usagi (In case your wondering, I got the name from the anime Usagi Drop. Its bloody adorable lol) "Life" (Even though she should really be death.

As long as she has enough mana for said corpse (in this case 5,000 to make a revivation successful/ 7,500 to be a 100% chance), she can revive him/her.