The Destroyer is an Asgardian weapon in the possession of Odin.
The Destroyer is a giant, metal beast. Its armour is resistant to projectiles such as bullets. The Destroyer attacks by opening triangular holes in its face from which red light would emanate, a destructive red beam would then shoot from these holes. It resembles an empty armour that can be controlled by a person without having to be in the armour.
In the movies
Odin used it to guard the Casket of Ancient Winters against intruders (such as the Frost Giants), while Loki sent it to Earth to kill his half-brother Thor and The Warriors Three. The Destroyer was defeated by Thor using his hammer Mjölnir, Thor hurling the hammer through its head. The Destroyer was then collected by S.H.I.E.L.D., and later a weapon with similar powers was created. Phil Coulson used it against Loki.