Ever since Roy and Benia discovered an object of a suspected underground ruin, they had been paying attention to everything in their surroundings.
Fortunately, Roy found that Big Black seemed to be heading in the direction of the ruin because more and more artificial traces appeared along the way.
The size of this possible demon ruin seemed to be enormous. From the moment they discovered the first artificial trace, Big Black had already gone about twenty kilometers deep, and they had yet to touch the core of the ruin.
The deeper they went, the fewer tunnels dug by the demon worms. In the end, there was only the path that Big Black had dug. Roy guessed that Big Black might have accidentally found this ruin and touched something there to mutate. Ultimately, only it could reach this ruin, and the other demon worms did not have the ability.
