You pronounce a death sentence onto a creature.

The target must make a Constitution saving throw, potentially being afflicted by

Instant KO

Critical Success (+10). The target is unaffected.
Success. The target takes 4d10 + 20 Dark damage.
Failure. The target rolls percentile dice. It has a 35% chance of being afflicted with Instant KO. This chance increases by 20% for each unique condition on the target, to a maximum 95% chance. If it does not get afflicted with Instant KO, or is immune to Instant KO, it takes 8d10 + 40 Dark damage instead.
Critical Failure (–10). As failure, except the chance to be afflicted with Instant KO is doubled.

A creature that is brought to 0 HP by this spell is killed.