Colossus

The Colossus is an enormous mech that was first introduced in "Stealing from the Elderly". Its assumed purpose is to defend the city of Argus if giant Grimm were to attack the city from the ocean.

Appearance
Standing at 30 feet tall, the giant mech is as tall as the Atlesian Military Base situated in Argus. It has a stocky build, with a rectangular cockpit and long, armored legs. It is armed with a cannon with rotary slots in place of its right arm. All but one rotary slot contains a form of Dust; the rotary slot without dust is a missile pod.

History
In "The Grimm Reaper", the right foot of the giant mech is seen on top of a building in the base.

The giant mech is fully seen in "Stealing from the Elderly". Rather than scrambling fighters, the Argus Military Base opens up revealing the mech, piloted by Caroline Cordovin herself. She fires a warning shot at the airship Weiss Schnee and Maria Calavera hijacked, temporarily disrupting its electrical systems. Refusing to let the two escape, Cordovin continues her pursuit of the airship.

In "The Lady in the Shoe", the mech was fought by Ruby Rose, Weiss, Jaune Arc, Nora Valkyrie, Lie Ren, Qrow Branwen, Oscar Pine and Maria.