A Coffin Wandering in Time and Space

Where did this coffin come from? Even the most powerful Emperor of Heaven today has no way of knowing. No one knows what kind of being lies inside this coffin. There are ten people and a thousand dragons. The dragon is pulling the coffin and the ten people are guarding the coffin. They are wandering in the universe. What are they looking for? It is said that if a mortal obtains that thing, he can instantly become an emperor. Even if a pig obtains it, he can transform into a god. Whether it is the mortal world or the fairyland, Whether it is the Abyss Demon Cave or the civilized world, Wherever they go, they are only looking for one thing - soul fragments.