Fragment of Rancor

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 uncbnscious and fail a savingAhrow, you take 2d6 psychic damage.