To write a fantasy novel in which the protagonist has the ability to time and space, you can follow the following steps: 1. Confirm the protagonist's background and personality. The protagonist should have a unique personality and background so that the reader can better understand and be involved in the story. 2. Set the source of time and space abilities. This ability might be given by the protagonist's own attributes or special spells or skills. The rules and limitations of this ability should be clear when setting it up. For example, the ability to travel in time should not affect the normal operation of the real world or bring too much trouble and responsibility to the protagonist. 3. Description of the protagonist's ability. When describing the protagonist's ability, one could start from the two aspects of time and space to describe the protagonist's performance and ability in different time and space. For example, it could describe the protagonist's abilities and actions at a certain point in time as well as his abilities and applications in another time and space. 4. Construct the storyline. When constructing the storyline, one needed to take into account the protagonist's abilities and the effects of time and space. For example, the protagonist could discover the secret of time travel in a certain historical event and decide to change history to lead to a series of stories and plots. 5. Shaping the character image. When creating a character's image, one needed to take into account the relationship and interaction between the protagonist and other characters. For example, the relationship between the protagonist and other characters, personality and actions, as well as the changes and growth of the characters in time and space. Ending and climax. At the end and climax, the readers needed to feel the protagonist's sense of accomplishment and satisfaction. For example, the protagonist could solve a series of difficult problems through his own ability or launch a thrilling battle in different time and space. A fantasy novel where the protagonist had the ability to time and space needed to have a unique plot and character setting so that the readers could better understand and immerse themselves in the story.