Desiccate

Conjure a blast of cursed sand to hex your foes. One creature you can see within range must succeed a Constitution saving throw. On a failed save, the target takes 3d6 Necrotic damage and becomes Blinded for the spell's duration. While a creature is Blinded by this spell, it cannot regain hit points. On a successful save, the target takes half damage and avoids being Blinded

At the start of each of its turns, a blinded target takes 1d6 Necrotic damage. Then the target may repeat the Constitution saving throw, ending the spell on a successful save.

At Higher Levels. When you cast this spell using a level 4+ spell slot, the initial damage increases by 1d6 for each slot level above 3.