The Sumo is a heavily-armored laser bot that deals great amounts of damage in close combat. It shines in an escort role, guarding more vulnerable units such as Sheldons from enclosing foes while soaking up long-range fire.

Beware its high energy cost per shot.

It's a lot stronger than the Welder, but also costs more. When you have enough of them they become quite an unstoppable force.