A skill you can buy for like 500k LP or some shit, and if someone dies and you get to them within 5 minutes you have a 50% chance of saving them.
Once brought back, you lose like half your base attributes and your abilities and have a week long buff that lowers your all stats so you are absolute shit. And maybe no running. LP is cut back by 1/3 because you are still too weak to study at full capactiy and you have a wound that takes a long time to heal.
Huge cost, not 100% to come back to life and if you do your character will suck for a long time, but at least you dont' have to start over. But if you do live its not like you can go on like you did before.