Every Disc One Final Boss needs a home, and that home is the Disc One Final Dungeon. Somewhere between the Noob Cave and The Very Definitely Final Dungeon is a suitably epic fortress/castle/ruins/cave/space station that could feel like The Very Definitely Final Dungeon, if it wasn't at the end of the first disc out of four. This dungeon can be anywhere from the first quarter of the game to just before the end, as long as it's epic enough to fake you out into wondering if it'll be the final dungeon, or at least give the characters a strong impression of that. The Disc One Final Dungeon is usually longer than previous dungeons, though that isn't always the case, and always culminates in The Reveal.