The Phantom Blade was a modification to the Hidden Blade pioneered and utilized by the French Brotherhood of Assassins. It added a projectile mechanism to the Hidden Blade, making it both fast and deadly at long range.
The Phantom Blade could be loaded with two types of projectiles: a regular projectile blade and a poisoned blade that caused the victim to attack others, allowing Assassins such as Arno Dorian to execute a silent kill or distraction. The Phantom Blade could be upgraded, allowing the user to fire two blades before reloading.
- A similar device known as the "Hidden Bolt" was made by Leonardo da Vinci in the 1500s for the Apprentice Francesco Vecellio. As he was not yet of the proper rank to use a Hidden Gun, the Hidden Bolt acted as a silent alternative which fired small crossbow bolts.