Bloodbind

You focus your arcane energy on a creature and tie their life force to yours.

Choose one creature you can see within range. That creature must make a Wisdom saving throw against your spell save DC. On a failed save their life force is bound to yours.

While a creatures life force is bound to yours, whenever you take damage, the creature takes Necrotic damage equal to the damage you took; this damage cannot be reduced or prevented by resistance or immunity to Necrotic damage.

Whenever the creature takes damage from this spell, it can repeat the Wisdom saving throw against the spell, ending the effects early on a save.

This spell has no effect on constructs or creatures that don't have blood.