My Soul for the Master

3rd-level necromancy

Casting Time: 1 minute

Range: touch

Components: V, S

Duration: 24 hours

You choose a willing ally to be bound to your soul. For the duration of the spell, if you are reduced to 0 hit points, you are instantly healed to one-quarter of your hit points.

The ally bound to you take damage equal to one-half your maximum hit points.. This damage may not be reduced or prevented in any way.