With a single gesture, you turn the enemy inside out. When you cast the spell on a living target, it is forced to make a Constitution saving throw. On a failed save, the target take 6d12 necrotic damage and looses half of its speed. On a successful save it takes half damage and its speed is reduced by 25%.

Each round you maintain concentration on this spell, you force the target to take additional Constitution saving throws:

Round 2. On a failed save, you deal 6d12 necrotic damage to the target, and its speed is reduced to 0. On a successful save it takes half damage and its speed is reduced to 50% of its original total movement speed.

Round 3. On a failed save you deal 6d12 necrotic damage to the target, and give the target a disadvantage on attack rolls. On a successful save the target takes half damage and is not disadvantaged.

Round 4. On a failed save you deal another 6d12 necrotic damage to the target, and give the target disadvantage on ability checks and saving throws. On a successful save the target takes half damage and is disadvantaged only on saving throws.

Round 5. On a failed save you deal 12d12 necrotic damage to the target.

If, when casting this spell or at anytime during its continuation, the target is already under or drops to under 100 hit points, it is turned fully inside out and dies instantly. The only exception to this is if a creature casts wish it's next turn, in which case the creature falls to 0 hit points and must succeed on their death saving throws to avoid death.

If the spell is used against an object, it automatically fails its save and is destroyed. All constructs are immune to this spell.