It was very important to build a leveling system in a fantasy novel because the leveling system could allow the reader to feel the growth and improvement of the character, increasing the reader's interest and dedication to the story. The following are some basic techniques for building an upgrade system: [1. Confirm the upgrade requirements: When building the upgrade system, you need to determine the upgrade requirements for the character.] For example, the protagonist needed to complete a certain mission or battle to level up. Leveling up could be a goal or challenge, or a special ability or equipment. 2. Setting up skills and equipment: Skills and equipment are important factors in character leveling. After leveling up, the character would obtain more skills and equipment to better complete missions and face challenges. These skills and equipment could be weapons, magic, props, and so on. 3. Setting the growth curve: The growth curve refers to the speed at which the character's performance increases after leveling up. Usually, the speed of a character's performance improvement after leveling up would gradually slow down over time, but there were special circumstances. For example, some characters 'performance improvement after leveling up would slow down until they reached a certain threshold. 4. Set the difficulty of leveling up: The difficulty of leveling up is the challenge and difficulty faced by the character when leveling up. The difficulty of leveling up could be a goal or challenge, or a special ability or equipment. The difficulty of leveling up could be increased or decreased gradually. 5. Setting up the level system: The level system refers to the difference in levels between characters. The higher the level, the stronger the abilities and skills of the character. When building the leveling system, you need to set a clear level system so that readers can clearly understand the differences between the characters. 6. Setting up the story and background: The leveling system also needs to be combined with the story and background. The upgrade system could add more elements and plots to the story, allowing the readers to experience the story better. These were the basic techniques for building an upgrade system. Of course, the specific implementation still needed to be adjusted according to the plot of the novel and the characteristics of the characters.