The Thrasher, also referred to as the Abomibegemot, was a Xenomorph-like pathogenic mutation of the Begemot, a hippopotamus-like animal native to the Union of Progressive Peoples mining planet Shānmén. Increasing in bodily length from the Begemot's original eight meters to twelve after infection, the Thrasher's head took up half of that length and featured a flower-like maw with inwardly-curving canine teeth for hooking prey. Inside was the Thrasher's retractable inner skull, which possessed a mouth lined with bony teeth; the Thrasher used these to masticate any prey caught in its maw. If the prey was too large to swallow, the Thrasher rolled to dismember it. The Thrasher's roar inspired fear in any who heard it.