The Nightingale Blade is a magical Ebony Shortsword.
The wielder gains +1 to attack and damage rolls.
On a hit, 1d6 damage is leeched from the target and that amount is also returned to the wielder as hit points.
The target must also make a Wisdom Saving throw (DC 15) or be affected by this effect for the duration.
An affected target's speed is halved and it can't use reactions. On its turn, it can use either an action or a bonus action, not both. Regardless of the creature's abilities or magic items, it can't make more than one melee or ranged attack during its turn. A creature affected by this spell may make another Wisdom saving throw at the end of each of their turns. On a successful save, the effect ends.