Umbra Burst

You cause shadows to expand and detonate in an area you can see within range. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 Psychic damage on a failed save, or half as much damage on a successful one. A creature in Dim Light or Darkness makes this saving throw with Disadvantage.

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.