Weapon (Longsword), Legendary (Requires Attunement)

You gain a +3 bonus to attack rolls and damage rolls made with this sword. In addition, while you hold the sword, you can take a Reaction to make one melee attack with it against any creature in your reach that deals damage to you. You have Advantage on the attack roll, and any damage dealt with this special attack ignores any Immunity or Resistance the target has to that damage.