Soulflayer
This spell is a class spell for warlocks and wizards.
Soulflayer
8th-level necromancy
Casting Time: 1 action
Range: 30 ft.
Components: V, S, M (a heart that was taken from a living creature)
Duration: Instantaneous
Corrosive strands of necrotic energy tear apart the soul of a creature of your choice that you are aware of within range. The target must succeed on a Constitution saving throw or take necrotic damage equal to half its hit point maximum (rounded down), or half as much on a success. A creature reduced to 0 hit points or killed by this damage has its soul permanently scarred, gaining the following flaw.
Flaw – Traumatized: I am damaged, unable to be whole. If I suffer another grievous injury, I may break.
Ref: TPKB1 p172