According to the conference rules, Sherlock could only bring three servants. As the Sludge Monster was one of the workers, he wasn't considered Sherlock's servant.
"For the past few years, the development of the Dungeons was on afterburners, and an increasing number of Devils purchased Dungeons to start their enterprise. You are being categorized in the Novice Group, but it's not because of your low-status Dungeon, poor location, or lack of resources. It's because of the large number of Dungeon Lords. With Lord Sherlock's status and capability, you could be in the Veteran Group Commerce Discussion!"
The butler put a convenient pen into his body and said, "The following is a note left by the Baron for Lord Sherlock. He also meticulously selected the required buildings and special talents for the initial development of Eternal Kingdom. This is the Veteran Group listing."