In the book of Revelation, there are several different apocalyptic metaphors and visions of the Last Day; all of them are Old Testament images that are now reused in the last book of the Bible:
Perhaps the most familiar Last Day image is that of Armageddon.
Armageddon is a “showdown image” – similar to Elijah confronting the prophets of Baal in the Old Testament. Satan and his evil forces are symbolically portrayed as gathering together in one place to fight against God and His People. The emphasis that is repeated three times is that it is a WAR OF WORDS — who speaks the truth? Christ or Satan? It’s a showdown to prove who is actually speaking the truth.