Assassins Shadow Blades

You reach into the shadows forging them into two daggers to use to bring down your target. These daggers last for one hour or until dispelled. The daggers count as a simple melee weapon with which you are proficient. Each dagger deals 1d8 psychic damage on a hit and has the finesse, light, and thrown properties (range 20/60). In addition, when you use the daggers to attack a target that is in dim light or darkness, you make the attack roll with advantage.

If you drop the weapon or throw it, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to cause the sword to reappear in your hand.