[quote=Ike]
I was trying to think of ways to bring rumors of all kinds, this is a brand new mysterious world and people hardly even began exploring it. So no worries, a key could be used for all sorts of things :P
[/quote]

Maybe it for the King's treasure? Maybe its not a literal key at all? It could be anything XD

I'm sure Brom will be turning up plenty of rumours in his investigations :P