It's bad to improve the people around him as they could be big a factor in the near future. Like what? If unexpected things happened, they can resolve the problem with their strength. Plus, if Kai faced a critical situation, they probably were reliable teammates.
Hmm... Yes, he was thinking about training himself too. But what he could do? These two needed more attention than him. As a matter of fact, he lowered his guard, there was a chance his party members getting injured by the monsters on this floor.
"I should just relax in the meantime, and avoid all the thoughts making me avaricious to use the [Necromancer] skill." He said inwardly, then proceeded to their expedition.
Amelia, Alexa, and Kai wandered on the 6th floor. In the place, where the monsters called Goblins usually appeared.
Well, the Goblins were the exact monsters that are suitable for their training. Why? It was because it had the strength and speed, that would be surely helped the adventurers to improve.