Dark Blast

You create a compressed orb of darkness, firing it at a point you can see within range. Each creature in a 20-foot-radius sphere centered on that point makes a Constitution saving throw, taking 6d6 necrotic damage on a failed save or half as much on a successful one. Creatures damaged by this spell have disadvantage on Constitution saving throws until the end of your next turn.

At Higher Levels. The damage increases by 1d6 for each spell slot level above 3rd.