THE BAD GUY IS YOUR FATHER!!!! wait....overused?
Now, seriously:
King Omun knows that in an earlier age, the three regions were all one. The kingdom was great and impressive. One particularly area of legends about them was an ancient catacomb, in the center of which was a magic room. Whoever enters this room can control unlimited power and can do ANYTHING. However, no one knows where it is, so by controlling everywhere, he can ensure that he finds it.
Now, here is the plot twist that would be so twisty that King Omun has no idea about it till it happens (though it might be kinda predictable). The room itself can only be operated by a Tarquin, as they possess all of the worlds "skills". When Omun finds out about this, he kidnaps _________ a relative/friend/pet/invisible friend of yours and holds them hostage. You must free them, but the only way to do it is to surrender to him.
The end battle would do something to trigger the collapse of the room, but at the last moment the hero uses the rooms power to destroy the main armies of omun (giving the resistance a chance)/ bring resistance army back from dead/ something else that will be benefitial to the freedom of the land. The last scene shows outside and the catacombs have collapsed, but the hero hasn't come out. It is assumed that he is dead, but at the end of the Hero's memorial/awesomeness dedication thing, we see him walk out, disguised (perhaps in a cloak he takes off when he rounds the corner?).
Just an idea, opinions? I have been trying to avoid stealing ideas from other games, but I think some are showing through a bit.
Great Quote:
"Time...LINE??? Time isn't made out of lines...it is made out of circles. That is why clocks are round!" -Caboose