I don’t know which specific novel you may be referencing, but generally:
Literary devices can be used to convey theme in many ways. You can use them to convey theme by describing the setting of the story, the mood of the story, the moral of the story, and much more.
You can use foreshadowing to hint at future events important to the story, symbolism to represent important objects relative to the theme, such as a dove in heaven, and you can use a metaphor to assert that one object is another, which brings new meaning to the original subject for a renewed comprehension. These can all improve the conveyance of theme in a story.
These are just a few of the many different literary devices that you can utilize to articulate subjects within a story to add to the understanding or to signify the importance of any detail within the story.”
