Unholy Revival

You return a dead creature you touch to life, provided that it has been dead no longer than 7 days. If the creature’s soul is at liberty to rejoin the body, whether willing or not, the creature returns to life with half its hit point maximum.  This spell uses the casters life force to return the target to life. Upon finishing the casting of the spell you take necrotic damage equal to half the targets hit point maximum and gain 2 points of exhaustion. Your hit point maximum is reduced by the same amount. If this brings you to 0 hit points, you die and the spell fails to revive the target creature. Every time you finish a long rest your hit point maximum is restored by 10 until your normal hit point maximum is reached.

This spell doesn’t remove magical diseases, curses, or similar effects; if these aren’t first removed prior to casting the spell, they take effect when the creature returns to life. The spell can return an undead creature to life. The creature remains undead. This spell closes all mortal wounds, but it doesn’t restore missing body parts. If the creature is lacking body parts or organs integral for its survival—its head, for instance—the spell revives the creature as an undead zombie. Coming back from the dead is an ordeal. The target takes a - 4 penalty to all attack rolls, saving throws, and ability checks. Every time the target finishes a long rest, the penalty is reduced by 1 until it disappears.