Aqueous. The inside of the golem armor can contain water to breathe in instead of air, if the creator chooses.

Clumsy. The golem armor has disadvantage on all Dexterity saving throws, and other creatures have advantage on all attack rolls made against it.

Freezing Backlash. When a creature within 5 feet of the golem armor hits it with a melee attack, the attacker takes 7 (2d6) cold damage, and if it doesn't have resistance or immunity to cold damage, it has disadvantage on the next weapon attack roll it makes before the end of its next turn.

Inert. When not inhabited by a controller that can cast spells, the golem armor is an object. While its not an object, its CR is the same as the level or CR of its controller (minimum CR 12), and it has the same senses as its controller.

Siege Weapon. The golem armor deals double damage to objects and structures.

Spell-Powered. The golem armor uses the spell attack modifier of its controller for its attack rolls, written as +X, and it uses the spell save DC of its controller for its other abilities, written as DC XX. The golem armor uses its controller's mental ability scores as its own, and the controller can see through the golem armor's senses.

Smash. Melee Weapon Attack: +X to hit, reach 15 ft., one target. Hit 24 (3d10 + 8) bludgeoning damage plus 18 (4d8) cold damage.

Breath Weapon. The golem armor exhales a blast of freezing air in a 30-foot cone. Each creature in that area must make a DC XX Constitution saving throw. On a failed save, a creature takes 28 (8d6) cold damage and its speed is reduced to 0 feet until the end of its next turn. On a success, a creature takes half damage and suffers no other effects.