Comes in sizes medium and large, and have much more health that the legs we already have. They would carry more weight, but be slower.
With this, add arms for robots. These can use saws, cannons, and maybe even harpoons.
mmm, how would the arms work? Would they be modules or joints that move? The latter would require a complete reprogramming of the control panel.
Maybe they would be modules, mounting cannons and providing all-round fire. They would require coal, and ammo.