One of the current custom close reasons of Writing SE is:
The community has decided that questions about existing literary works, except in a writing-specific context, are off-topic. For more information, see this meta answer.
Asking about existing literary works is off-topic on a site about Writing; that makes sense. But there are other SE sites which are specifically devoted to questions about existing literary works; wouldn't it be nice to mention them in the close reason too, give a pointer to an OP who might have asked a good question but on the wrong site?
I'm thinking primarily of Literature SE, which accepts all sorts of questions about existing literary works (note: not recommendation or open-ended list questions!) There's also Science Fiction and Fantasy and Anime and Manga, but as those cater only to specific subsets of "literary works" (plus other stuff as well), I wouldn't suggest mentioning those in the close reason, in case an OP of a non-sci-fi/fantasy non-manga question gets confused by being pointed there.
Can we update the close reason text to link to Literature SE as a potential alternative venue for such questions?