Wrath of Baator

You open a gateway to the lowest planes of the nine hells, brimming with hellfire and the souls of the damned. A 20-foot radius sphere of flames and crimson necrotic energy appears, centered on a point within range lasting the duration. The space of filled with the screams of agony from the voices of the damned souls lost in the hellfire that can be heard up to 30 feet away. Creatures within the area are overcome with terror by the blazes and screams and become frightened

The energy creates a warp in the fabric of space and time, making it difficult terrain. Any creature that starts its turn in the area takes 3d6 fire damage. Any creature that ends its turn in the area must succeed on a Dexterity saving throw or take 3d6 necrotic damage as the souls of the dead cling and scratch at their bodies.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the fire damage and the necrotic damage both increase by 1d6 for each slot level above 4th.