This is a Gift of Damnation you can receive from the Devilish Contractor Boon.
Once per turn, when you miss with a weapon attack or Unarmed Strike, you can reroll the attack roll. If the reroll hits, you must spend 3 Hit Point Dice and add the result to the attack’s normal damage as Force damage. If the reroll misses, you must spend 3 Hit Point Dice and take Psychic damage equal to the result. If you have fewer than 3 Hit Point Dice available, you cannot use this gift.
Once you hit a target with an attack using a rerolled attack, you cannot use it again until you finish a Long Rest.
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