Construct Combiner - Left Arm

Blasting Off. (Arm Mode Only) While in Arm mode the construct flies via rocket propulsion. After transforming to Arm Mode or at the start of it's movement all creatures within 5ft must make a DC 15 Strength Saving throw. On a fail they are pushed back 10ft and take 7(2d6) fire damage. On a success they take half damage and are not pushed back.

Combine! Brute Justice. When a Construct Combiner - Body uses it's Brute Justice ability the construct can immediately use it's Brute Transformation ability to enter Arm Mode (if it is not already in it). It can also then move it's full movement towards the Construct Combiner - Body and combine with it. While combined the construct has a movement of 0 and it can only use it's action to either separate from Brute Justice or use it's Defense Protocols. 

Defense Protocols. As a action the construct can increase it's AC by 2 until the start of it's next turn. While as part of Brute Justice this AC increase applies to all Construct Combiners part of it.  

Brute Transformation. As an action the Construct can transform between Arm mode and Humanoid mode. In Arm mode the Construct gains a flying speed of 50ft but loses it's walking speed. When transforming from Humanoid mode to Arm mode the construct takes flight through rocket propulsions. See it's Blasting Off trait for the effects for this. While in Arm Mode the construct has the shape of a single arm the size of it's whole body. 

Slam (Humanoid Mode only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 3) bludgeoning damage. 

Rocket Slam (Arm Mode only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 18 (3d8 + 3) bludgeoning damage. While in Arm Mode if the Construct moves 15ft in a straight line towards a target it can attempt to make a Rocket Slam. On a successful attack roll the target must make a DC 15 Strength Saving throw. On a fail they are considered grappled by the target, as it's large arm holds them.