For the remaining duration of the buff he received from the Labyrinth, Kael stayed on the second floor and hunted the monsters that were relatively close to his rank.
It was because he knew that the C-Rank brought a qualitative leap, so he didn't want to take unnecessary risks—especially since the temptations from the Crimson Tree were very strong on the second floor.
Kael feared he would lose control and fall into the illusion if he was in a weakened state. That would be terrible.
So, for three days straight, he fought and killed like a madman. His Draconic physique sustained him, so he didn't really need anything else aside from some rest.
It also helped him in circles exploring the entire second floor, through which he also made a detailed map. It helped him learn a lot of things.
