The black blade of this sword is crafted from a mysterious arcane alloy. You gain a +1 bonus to attack and damage rolls made with this magic weapon. While the sword is on your person, you are immune to effects that turn undead.
While holding the sword, you can use an action to give yourself 1d4 + 4 temporary hit points. This property can't be used again until the next dusk.
When you hit a creature with an attack using this weapon, you can fill the target with unsettling dread: the target has disadvantage on the next saving throw it makes before the end of your next turn. The creature ignores this effect if it's immune to the frightened condition. Once you use this property, you can't do so again until the next dusk.
A Versatile weapon can be used with one or two hands. A damage value in parentheses appears with the property. The weapon deals that damage when used with two hands to make a melee attack.
If you hit a creature with this weapon, that creature has Disadvantage on its next attack roll before the start of your next turn.