conclusion — When you come to a conclusion, you decide that something is true after you have thought about it carefully and have considered all the relevant facts.
coda — A coda is a separate passage at the end of something such as a book or a speech that finishes it off.
speech — the faculty or power of speaking; oral communication; ability to express one's thoughts and emotions by speech sounds and gesture: Losing her speech made her feel isolated from humanity.
monologue — a form of dramatic entertainment, comedic solo, or the like by a single speaker: a comedian's monologue.
afterword — An afterword is a short essay at the end of a book, usually written by the author.
postscript — a paragraph, phrase, etc., added to a letter that has already been concluded and signed by the writer.
sequel — a literary work, movie, etc., that is complete in itself but continues the narrative of a preceding work.
swan song — the last act or manifestation of someone or something; farewell appearance: This building turned out to be the swan song of Victorian architecture.