Six holding the film version of the Diamond Blade Dagger

The Diamond Bladed Dagger is a weapon left to Number Four in his Loric Chest.

It is about 4 inches long and has a diamond blade sharper than any razor. When Four prepares for battle, the handle expands and wraps perfectly around his hand.

In a fight with a Mogadorian, Four discovers that his dagger can cut a Mogadorian Sword in half, the energy impact between the blades causes a blinding light.