It was actually a very controversial issue whether borrowing the skills and settings of other people's novels was considered copyright violation because the law did not clearly state this. In law, the right to create a work was usually considered to belong to the author rather than the object described in the work. This meant that if the author borrowed skills and settings from other works and used them in his own work, then the borrowed parts would not be considered copyright. However, this did not mean that the author could freely use the content of other works. If the author used the content of these works in his own work and modified, adapted, or expanded it, then these actions may constitute copyright. In addition, if the fictional characters, locations, plots, and other elements in the work are too similar to the same elements in other people's works, it may also lead to being identified as an copyright violation. Therefore, when writing a novel, the author had to be careful about borrowing the content and settings of other people's works and avoid violating the creative rights of others as much as possible. If you need to borrow it, it's best to consult the relevant legal opinions to ensure that the behavior does not constitute an invasion.