True Destiny Bond

An etherial black chain sprouts from your heart and reaches for the heart of the creature that caused you to drop to 0 hit points. That creature must succeed on a Wisdom saving throw or fall unconscious. The creature regains consciousness only when you regain consciousness, when you become stable, when the creature receives any form of healing or stabilization or when the spell is dispelled.

If the creature is stabilized or healed, it instead regains consciousness and you are stabilized or healed in its place. If you die while this spell is in effect, the creature suffers Instant Death.

The spell ends when the creature either regains consciousness or dies.