Callidora's Mental Strain

You extend your psionic energy out into a space focused on a one-inch orb. You may choose a space for the orb to expand its radius. Each creature in a 20-foot-radius sphere centered on that point must make an Intelligence saving throw. A target takes 8d6 psychic damage on an initial failed save and has disadvantage on attack rolls and saving throws for the duration, or half as much damage on a successful one and no disadvantage.

The purple energy spreads around corners. As the sphere expands it makes the sound of haunting howl.

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.