Blood Wave

By draining your life force and expelling the energy created, you can deal massive damage to creatures around you. When you cast this spell, creatures of your choice within a 30 foot sphere centered on you must make Constitution saving throws. On a failed save, a chosen creature takes 10d8 necrotic damage. A creature takes half damage on a success. You take necrotic damage equal to the total damage roll for this spell as a part of the casting.

At Higher Levels. When you cast this spell using a 7th level spell slot or higher, the damage increases by 1d8 for each slot level above 6th.