You release a mournful wail that pierces into the mind of those that hear it. Each creature within 20 feet of you must make a Constitution saving throw. On a failed save, a creature takes 4d8 psychic damage, and falls unconscious. On a success, it takes half damage and suffers no other effect. An unconscious creature wakes up if it takes any damage or if another creature uses its action to shake them awake. A deafened creature automatically succeeds on the save.