Quote Originally Posted by The Grand List of Console Role Playing Game Cliches, Rule 190
Weapon Rule
There's always a hidden creature who is much harder to defeat than even the ultimate bad guy's final, world-annihilating form. It's lucky for all concerned that this hidden creature prefers to stay hidden rather than trying to take over the world himself, because he'd probably win. As a corollary, whatever reward you get for killing the hidden creature is basically worthless because by the time you're powerful enough to defeat him, you don't need it any more.