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 M45 shotguns used by Kelly-087.

Gameplay
Oathsworn is a mythic weapon in Halo 5: Guardians. The weapon has increased damage, accuracy, and rate of fire compared to the normal shotgun, and the user's movement speed is increased while the weapon is equipped.

List of appearances

 * Halo: The Fall of Reach - The Animated Series
 * Halo 5: Guardians

Trivia
The rabbit painted on the side of the shotgun is a reference to Kelly-087's nickname, Rabbit.