Benefit
When you hit a creature with an attack, you can choose to deal either an extra 2d6 psychic damage to the creature or 4d6 psychic damage to each other creature within 5 feet of it. After you use this benefit, you must finish a short or long rest before you can use it again.
Drawback
Whenever you are not unconscious and fail a saving throw, you take 2d6 psychic damage.