Animated Armor Juggernaut

Adamantine Shell. When the armor is the target of a critical hit, it can choose to make it a normal hit and instead reduce its AC by 2 permanently.

Multiattack. The armor makes two Slam or Kick attacks in any combination.

Slam. Melee Attack Roll: +7, reach 5 ft. Hit: 14 (2d8 + 5) Bludgeoning damage, and the target is subjected to the following effect. Strength or Dexterity Saving Throw: DC 15. Failure: The target is knocked Prone.

Kick. Melee Attack Roll: +7, reach 10 ft. Hit: 16 (2d10 + 5) Bludgeoning damage, and the target is subjected to the following effect. Strength Saving Throw: DC 15. Failure: The target is pushed up to 10ft. away.

Bolster. If the armor is within 5ft. of a friendly Animated Armor, it can use its bonus action to instantly reduce it to 0 hit points. The plates of the original Animated Armor reshape and join onto the Juggernaut's plate, increasing its AC by 1 and its Strength by 2 but decreasing its movement speed by 10ft.

Electrical Discharge. Upon taking lightning damage, the armor can use its reaction to redirect half of the damage rounded down to a creature it can see within 30ft. of it. This uses the same attack roll or saving throw of the original attack roll or saving throw.