Fantasy novels often set a world full of magic and mystery, in which characters usually improve their strength through cultivation and combat. However, some characters in fantasy novels don't seem to really improve. This may be because of the following reasons: 1. Inappropriate cultivation method: In some novels, the cultivation method of the characters may be unhealthy or unscientific, such as being overly addicted to a certain magic or skill or lacking proper rest and diet. This kind of cultivation method would not only cause fatigue to the body, but it would also affect the improvement of their strength. 2. Plot Requirement: In some fantasy novels, the improvement of the characters may be necessary to achieve a certain goal or plot development. However, this progress was not necessarily sustainable or only a superficial phenomenon that appeared in a short period of time. 3. A lack of challenges: In some novels, characters may lack real challenges and difficulties, unable to learn and grow from reality. The characters in these novels might just be repeating a certain cultivation or combat method without real change and progress. Therefore, the reason why the characters in the fantasy novels did not improve could be because they wanted to cater to the needs of the plot, or it could be because their cultivation or growth methods were unhealthy or unreasonable, or because they lacked real challenges and feedback.