" The Nephilim King's Butler " was a fantasy novel, and there were many similar novels. The following are a few possible choices: 1 " Battle Through the Heavens ": This is a very popular fantasy novel that tells the story of a young man's growth. He experienced various challenges and battles in the process of pursuing strength. "Douluo Continent": This is an equally popular fantasy novel. It uses the world of a soul master as the background to tell the story of the protagonist's growth and his battles with various enemies. 3." The Peak of Martial Arts ": This is a fantasy novel with a martial arts theme. The protagonist grows up and fights with various enemies in the process of practicing martial arts. [4. The Master: This is a fantasy novel with a game theme. It tells the challenges and battles of a professional gamer in his career.] These novels all had a strong fantasy color. The protagonist experienced various challenges and battles in the process of practicing magic or martial arts in pursuit of strength. If you like this type of novel, you can try reading these novels. It might give you the feeling you want.