Phobos-7

The Phobos-7 Walker is a mobile terraforming platform and war walker used by the Martians to clear the way for their colonization of Earth.

Lore
In their bid to take Earth, the Martians continue to build ever-more powerful machines. Phobos-7 is the ultimate terraformer, destroying any trace of humanity and leaving behind naught but ash. Those foolish enough to try stopping Phobos-7 find it is built for much more than terraforming. Get on the wrong side of its lasers, and you will be left with an empty chasm where your forces once existed.

Trivia

 * Phobos, in Greek Mythology, was the son of Ares and represented fear. He was the twin brother of Deimos, terror.