Decay

You extend a wispy tendril of darkness towards a creature or target within range. Make a spell attack against the target. On a hit, the target takes 1d4 necrotic damage. The target must make a constitution saving throw, or continuously take this necrotic damage for the spell’s duration. The target can make this constitution saving throw at the end of every one of its turns.

At Higher Levels: This spell’s damage increases by 1d4 when you reach 5 level (2d4), 11 level (3d4) and 17 level (4d4)