Knight blade

The knight blade is a UNSC weapon attachment that is used to counter personnel in close quarters combat, but additionally it is able to inflict heavy damage and knockback against vehicles. It is presumably based off of the same technology that the Promethean Knights use.

Gameplay
If a loadout weapon has this attachment equipped, it will display different melee animations and also cause a one hit kill on personnel. It has also been shown able to destroy a Ghost in a single attack. It is noted to increases melee effectiveness, damage, and knockback against vehicles.

This attachment can only be applied to the assault rifle, battle rifle, and DMR.

List of appearances

 * Halo 5: Guardians