What would you say the general rules are for epilogues? Are they to end a book entirely or can a sequel be forged based on the epilogue of a previous title? How long do you think they should be? Can the POV be changed entirely during an epilogue? (Say, the book is written in third POV and the author elects to do the epilogue from the protagonist's POV?) Must the epilogue be written about the main character or can it be written about the antagonist, a supporting character, or even a pet hamster who was watching everything? Any other sundry thoughts on epilogues?