Hana

Arthur didn't need to sleep in the Spirits Realm, but it helped him to meditate. He understood that the more he detached himself from thinking, the more he aligned with the world. That's was the way to grow stronger in the Spirits Realm and probably the outside world. 

Li's case was unique, as he needed to grow stronger beyond his limits. The only reason he reached the Skyey World and contracted the gravity spirit was Arthur's abnormal spiritual energy. 

The morning of the third day arrived, and Arthur left his room in another chase of the black cat. As soon as he did, he heard cheering of a crowd coming from the deck. 

Arthur navigated his way through the ship to reach the gathering crowd. The sound of splashing water and the erratic movement of the vessel made him suspect an aquatic spirit being nearby, and he was right.