Unrelenting Darkness

Magical darkness spreads from a point you choose within range to fill a 45-foot-radius sphere for the duration. The darkness spreads around corners. A creature with darkvision or truesight can't see through this darkness. Nonmagical light, as well as light created by spells of 5th level or lower, can’t illuminate the area.  If you are a Shadow Sorcerer, you can spend 5 Sorcery Points when casting Unrelenting Darkness to see with Darkvision.

Whenever a creature starts its turn in the sphere, it must make a Constitution saving throw, taking 6d6 Necrotic Damage on a failed save and becoming frightened of you for 10 minutes.  On a successful save, they take half as much damage and are not frightened.