This cruel life of mine

Choose one creature you can see within range. The target must make a Constitution saving throw. On a failed save, it takes Necrotic damage equal to half the hit points you are currently missing (rounded up). On a successful save, it takes half as much damage.

If the saving throw result is a natural 1, the target instead takes Necrotic damage equal to all the hit points you are currently missing.

If this spell reduces the target to 0 hit points, you regain hit points equal to your spell save DC.

"Be silent, be still
Feel the bite of the chill"