Technically, using Nanohaverse rules:
Necromancy =
NO HELL NO NOT GOING TO HAPPEN NO MATTER WTF!!!
Because of that I was forced to nerf
Redemption to a uber heal rather than a downright
Resurrection.
In other words, as long as that person is revivable by paddles, the spell would work and bring him back with very little vitality left in him. After that, you have to stabilize him with very powerful heals/extreme life support. And even then, if he/she is supposed to die, there's no way you can stop the bleed.
That's my take on Zest; rather than being a Death Knight, I believed what Jail did was drag him back from the brink, stuffed him with extreme treatments to keep him alive, and made him serve him because he refused to let Zest die. Zest kept going in the end because of Regius and maybe to protect Lu-chan.
Besides, if Resurrection is possible, what's stopping my holy OCs from making Jesus out of everyone?! It'll suddenly make my mains so h4xx, so I'm against reinstatement of Resurrection!!!