Arrow - Leeching Doom

Before you roll the attack with this arrow you may expend and roll any number of your available hit dice (adding your Constitution modier to each dice roll). You lose hit points equal to the total value. Hit points lost this way cannot be regained until you take a short rest, and if this reduces you to 0 hit points you make the attack roll with disadvantage and then you die.

A creature hit by the ammunition takes additional  damage equal to the hit points lost, and each creature within 10ft of the target must succeed on a DC 13 dexterity saving throw or take psychic damage equal to the amount of hit points lost, taking half damage on a successful saving throw