Vile Rebirth

  You violently stitch severed flesh back together, infusing the vessel with a surge of necrotic energy. You can touch a creature that has died within the last minute, allowing that creature to return to life with 1 hit point, provided its soul is willing. This spell neutralizes any nonmagical diseases and poisons that affected the creature at the time of death, but it cannot bring an undead creature back to life or restore a creature that died of old age.

The Necrotic Price; Jumpstarting a heart requires your own vitality and strains the target's physical form:

• The Target: The creature must make a DC 13 Constitution saving throw upon opening its eyes. On a failed save, the violent transition leaves them weakened, resulting in 1 level of Exhaustion. On a success, their body stabilizes perfectly, and they ignore this exhaustion.
• The Caster: You take 2d6 Necrotic damage that ignores Resistance and Immunity. Additionally, you gain 1 level of Exhaustion. You can remove this specific level of Exhaustion by finishing a Short or Long Rest.