If it wasn't for Li Yunmu, Rat and Old Bastard would probably still be inside the colosseum, working as warriors of the lowest run of society. If they had good luck, they might encounter a descendant from the four clans who would realize their worth and would bring them back as a servant or a hired thug. But if their luck was bad, they might get injured to the point of disability by some beast in the colosseum or even be killed. They were simply tools used to entertain others.
But ever since they started following Li Yunmu, not only had the lowest class people of lower city formed the Ground Clan, the two of them obtained positions of authority in the clan. Most importantly though, they had gained a god level cultivation base.