You gain a +3 bonus to attack and damage rolls made with this sword. Hit points lost to this weapon's damage can be regained only through a short or long rest, rather than by regeneration, magic, or any other means.
You're unwilling to part with this weapon while attuned to it. While attuned to this weapon, you also have disadvantage on attack rolls made with weapons other than this one.
The vengeful spirit possessing the sword shares its history and lust for vengeance with the wielder. After each successful long rest, you experience nightmares of the spirit's past, culminating in its death. When you wake, you must make a DC 11 Constitution saving throw. On a failed save, you only gain the benefits of a short rest. Only the Remove Curse spell allows you to end attunement to this item.
This item corrupts. See the "Infernal Item Corruption" section.
When making an attack with a Finesse weapon, use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.
When you take the Attack action on your turn and attack with a Light weapon, you can make one extra attack as a Bonus Action later on the same turn. That extra attack must be made with a different Light weapon, and you don't add your ability modifier to the extra attack's damage unless that modifier is negative. For example, you can attack with a Shortsword in one hand and a Dagger in the other using the Attack action and a Bonus Action, but you don't add your Strength or Dexterity modifier to the damage roll of the Bonus Action unless that modifier is negative.
If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.