Umbral Assault

You point towards a creature within range. The shadows of creatures within 5 feet of the target then turn against the first creature, attacking them from all sides. The target must make a Dexterity saving throw. The creature takes 3d6 damage for every creature within 5 feet of it, up to a maximum of 24d6 on a failed save, or half damage on a successful one.

At higher levels. When you cast this spell using a spell slot of 8th level or higher, the damage increases by 1d6 for each slot level above 7th, bringing the maximum to 32d6 at 8th level and 40d6 at 9th level.