Blight Bolt

Necromantic energy shoots out at a creature of your choice that you can see within range. The target must make a Constitution saving throw. The target takes 8d8 necrotic damage on a failed save, or half as much damage on a successful one.  From where the bolt lands each creature in a 5 foot sphere must make a Constitution saving throw or take 1d4 damage

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.