Burgeoning Necrosis

You imbue a gnawing decay into a creature you touch. At the end of the target's turn, they must make a Constitution saving throw. On a failed save, the target takes 1d12 necrotic damage. The damage increases by 1d12 after each failed save. The target takes half as much damage on a successful save and if the target succeeds on three of these saves, the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the initial damage increases by 1d12 for each slot level above 4th.