What is the role of a spoiler in a narrative?

A spoiler serves the purpose of revealing important plot details that can significantly impact a reader's experience of the narrative. By disclosing key events or twists before they are encountered in the story, spoilers can diminish the suspense and surprise that are crucial elements of storytelling. When readers are already aware of pivotal moments or endings, the emotional impact and tension built throughout the story can be reduced, as they may no longer have the same level of engagement or curiosity about how events will unfold.

This understanding highlights the essence of what a spoiler does in a narrative context—it alters the way a story is perceived and experienced. Other choices relate to aspects of storytelling but do not directly align with the specific function of a spoiler in a narrative.