Darkga (Dark III)

You concentrate necrotic energy in the earth beneath a target creature in range you can see. All creatures within a 20ft. radius of the creature must make a Dexterity saving throw against your spell save DC, taking 8d6 necrotic damage on a failure and half as much on a success.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.