The Mantle a weapon that you can only use in the last mission/quest fo the story to complete it (hoping to be able to replay missions) . you can choose to make it any type/class of weapon, with the ammo and power varying accordingly. It would be like 4 times as strong as the next most powerful weapon of that class and you use it in the fight against the final boss In multiplayer, it could function similar to the tactical nuke from cod modern warfare 2. after a 25 killing spree, you automatically equip this weapon if you choose to deploy it (the only kind of "ordnance" reward in the entire multiplayer, though you equip it immediately) it gives you an overshield, has 360 degrees auto aim and kills a normal titan in 1 shot. if you die, your enemies can't pick it up, but your team mates can (only weapon they can pick up, rather than the weapon's class ammo)