You have a +3 bonus to attack and damage rolls made with this magic weapon. In addition, you can make one additional attack with it as a bonus action on each of your turns.
You're unwilling to part with this weapon while attuned to it. You're also vulnerable to radiant damage and each time you receive magical healing, you must make a DC 15 Constitution saving throw.
On a failed save, the healing has no effect. Only the Remove Curse spell allows you to end attunement to this item.
This item corrupts. See the "Infernal Item Corruption" section.
If a weapon has the thrown property, you can throw the weapon to make a ranged attack. If the weapon is a melee weapon, you use the same ability modifier for that attack roll and damage roll that you would use for a melee attack with the weapon. For example, if you throw a handaxe, you use your Strength, but if you throw a dagger, you can use either your Strength or your Dexterity, since the dagger has the finesse property.
This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.