Unravel

The cutter of fate begins to unravel your targets very essence. The creature must make a Constitution save or take 3d8 necrotic damage at the start of each turn. The creature will be able to retry the saving throw at the end of each of its turns. The spell is removed when the creature succeeds or is healed.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 3.