This category is not for articles on individual books, but for articles describing a series as a whole. Individual books which are part of a series should instead be categorised in their own sub-category.
This category includes all fantasy series (e.g. of novels, children's storybooks, or anthologies). Note that an article on a series of novels should be categorized in the subcategory Category:Fantasy novel series. Only fantasy series with non-novel members such as Fritz Leiber's Fafhrd and the Gray Mouser series (which contains some short story collections) should use this category.
See also Category:Fantasy books by fictional universe.