Death Blight

An ancient Death Hex created by the Kazealian Death-rite Clergyman. A deathly mist coalesces around a creature of your choice that you can see within range, draining vitality from it. The target must make a Constitution saving throw. If the saving throw fails by 5 or more, the target is reduced to 0 hit points. Otherwise, the target takes 19 (3d12) necrotic damage. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d12 for each slot level above 3rd.