The Barbaric Machine Beasts (蛮機獣 Bankijū?) are monsters created to pollute the Earth. They are each separated into one of three types that are under the Pollution Ministers: Savage Ground (害地 Gaichi?), Savage Sea (害水 Gaisui?), and Savage Sky (害気 Gaiki?). The Barbaric Machine Beasts are infused with a special energy called Bikkurium (ビックリウム Bikkuriumu?) that enlarges them in a process called Industrial Revolution (産業革命 Sangyō Kakumei?), however this process can be activated while the Barbaric Machine Beast is still alive. They are named putting the suffix "Banki" (バンキ Banki?) after the name of the object they are based on, machines that were present at the turn of the century. When scrapped, the bodies of the dead Savage Machine Beasts shrink back to normal size and end up at the Savage Machine Beast Graveyard. Yogostein took advantage of this in his Savage Machine Beast program by using Ugatz souls to reanimate the Recycled Barbaric Machine Beast Army (リサイクル蛮機獣軍団 Risaikuru Bankijū Gundan?, movie), only for them to be rescrapped by the Engines due to being much weaker than they used to be.