Lin Li stayed in the Tower of Dusk for 20 days, and he politely declined all visitors. He focused on strengthening his realm once more. The conversations that he had with the three arbitrators definitely made Lin Li gain a lot of knowledge. Just because he did not advance in level, it did not mean that his strength hadn't increased. In particular, the use of power in the Sanctuary-realm was the knowledge that Lin Li needed the most now.
20 days later, Lin Li himself could feel that the combat power he was able to exert now was absolutely no longer comparable to what he had been able to use before. It was actually like a person who possessed a weapon having to learn how to use it and how to exert its power to the fullest. It was like the difference in combat power between a person holding a sword and slashing like a madman and a person who had an amazing mastery of swordsmanship. The combat power exerted by the same sword would be different in his hands.