Really badly written crap, which races along at too fast of a pace, and poorly inserts character development. I'd really like to try my hand at another idea now. If I ever come back to this, it will almost certainly be a complete re-write.

Equestria was isolated; nopony had ever seen a human, and only a select handful had even heard of their legends. This was to be ended with a powerful being playing games, using the ponies under Celestia's rule as the game pieces.

Celestia herself is pulled into a gladiator-style battle, where the only way to win is for the other to willingly admit defeat.
The final answer to the mysterious game and its player will surely bring more questions than answers,.