Existential Paradox (Chronomancy School of Magic)

When you cast this spell, you focus on a creature you can see within range. The creature must succeed on a Wisdom saving throw or have its consciousness thrust back in time to a moment before it existed. The existential shock of the experience causes it to take 20d10 psychic damage. If this damage reduces it to 0 hit points, the creature ceases to exist. Whether the save fails or succeeds, the creature gains a form of indefinite madness.