Metroplex (FOC)

Metroplex is the result of Optimus's last ditch effort to repel the Decepticon siege of Iacon. Much like his G1 incarnation, he's a towering city bot. Maybe not a city, but he's still massive. He heeds the call of the last Prime. That basically means that Optimus can mark targets and Metroplex will destroy that area in a multitude of ways. For example, he launches artillery from his shoulders or even wades into the battlefield, stepping on some poor Decepticons. In the mission "Metroplex Heeds the Call", he even walks up to a Decepticon Warp Cannon that's targeting the Ark and charges into it and leveling it with a swipe from his massive arm. Even when Metroplex is in the background, he swats down dropships, and unleashes a STORM of cannon fire towards numerous Decepticons. Too bad he doesn't just wade up to Megatron and flick him into orbit.