Floating Armour. The armour in the cube floats around constantly. At the start of each of the cubes turns, roll a d20. What you roll will be the AC of the cube until the start of its next turn.
Repeated Bash - If a creature fails the STR saving throw for the cubes slam 3 times without taking a long rest, their movement speed is reduced by 10 ft. This feature does not stack.
Armour Slap. Melee weapon attack , +5 to hit, reach 5 ft. Hit 12 (4d6) bludgeoning damage
Slam - The cube slams itself into another creature. That creature must make a STR saving throw or be knocked back 20 ft and fall prone. If the creature is thrown into a wall ( or anything similar to a wall ) they take 2d6 bludgeoning damage.
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