Oathsworn

"Memories of loss and dreams of vengeance, sealed in steel and composites. Mythic Shotgun with increased damage, accuracy, and rate of fire. The user's movement speed is also increased while Oathsworn is equipped."

- In-game description.

Oathsworn is a series of custom-crafted M45D shotguns used by Kelly-087.

Gameplay
The Oathsworn is a mythic weapon in Halo 5: Guardians. As a slightly upgraded version of the Lawgiver, the Oathsworn has increased damage, accuracy, and rate of fire compared to the normal shotgun, features slightly more range and accuracy over the Lawgiver, and the increases the user's movement speed while the weapon is equipped. As the weapon has a built-in Speed Boost, users of Oathsworn receive white auras and highlights.

In the campaign, the Oathsworn can be equipped only if Kelly is selected by a player in cooperative play. Because of this, the Oathsworn is the only special weapon in the game that cannot be equipped in the solo campaign. The campaign rendition of the Oathsworn has the Speed Boost removed and is exactly identical performance-wise to a standard Shotgun, including the strong recoil.

Trivia

 * The rabbit painted on the side of the shotgun is a reference to Kelly-087's nickname, Rabbit.
 * Near the trigger, the words "REMEMBER REACH" are etched onto the weapon.

List of appearances

 * Halo: The Fall of Reach - The Animated Series
 * Halo 5: Guardians
 * Halo: Official Spartan Field Manual
 * Halo: Lone Wolf