Umbral Inferno

You conjure a dark, blazing inferno of crimson and black flames at a point within range, erupting into a 20-foot-radius sphere. All creatures in this area must make a Wisdom saving throw as the shadows of the flames warp their minds and bodies.

On a failed save: A creature takes 8d8 fire damage and 8d8 psychic damage as the flames scorch their body and negative energy assaults their mind. These creatures are Shadowmarked for 1 minute, experiencing persistent, haunting visions of you as a menacing shadow dragon. While Shadowmarked, creatures are frightened of you and suffer 2d10 psychic damage at the start of each of their turns as the illusions claw at their sanity. A creature can make a new Wisdom saving throw at the end of each of its turns to end the Shadowmarked condition.

On a successful save: A creature takes half as much fire and psychic damage and does not become Shadowmarked.