The chaothrumbo is a human transformed into a monster 8 times the size of the average pony. Equiped with a big legendary anti-material sniper rifle battle saddle. Oversized horns and six small eyes on his head. The transformed human is a formidable opponent for those seeking to harm ponies. He lives in the main base on a yet to be explored planet. The main base in question is called New Mojave capital. Was located in a idylic meadow. 

The reason why the base was there of all places on this unexplored planet wasn’t neccesarily because it was the most habitable biome but because thats where the pony spacecraft that discovered the planet, crashed.