I agree with the other person here, but depending on the context, you will not need an article all. "...one expects to meet on fantasy book pages..." This would be a speech that is being told in a more heightened, dramatical or theatrical way; or old-fashioned English.

The zero article is correct here. ... on fantasy book pages, ... The reference is to a category (pages, dictionary pages, fantasy book pages), so the zero article is required. English Grammar in Use by Murphy is a well-known grammar book for self-study, practice, and reference. I think a PDF of the 4th edition is floating around the internet. Unit 74 p. 150 - The 3 (children / the children) excerpt When we are talking about things in general, we do not use "the" - I'm afraid of dogs. (dogs = dogs in general, not a specific group of dogs) ... We use "the" when we mean specific things or people. Compare: - Children learn from playing. (= children in general) - We took the children to the zoo. (= a specific group, perhaps the speaker's chidren)

Thanks, Robert! I will paraphrase the sentence.

As you are mentioning the 'pages' as the ultimate item and not just book: use 'the pages of a fantasy book' OR '...one expects to meet IN a fantasy book, but not...'