This is the gigantic transformation of Knight Sandrock. Possessing both the strength of the Gundam Clan and the special abilities of a Majin, he fights bearing the hopes of those who wish for peace. A curved sword can be attached to his shield, transforming it into a bow or a close-combat weapon with the blade facing forward. He can freely manipulate the shield, seemingly with a will of his own, rendering enemies unable to attack.

Wing's resentment filled his loyalty to the Knights, clad Sandrock in the Armor of Souls, transforming him into a Majin.

Equipped with a junction provided by arms dealer Howard, Majin Sandrock powered up. The barrel responds to Quatre's harp of guidance and unleashes its power. The sound of its blades cuts through the air, playing a requiem to lure the enemy.