What happens when the 'Hero' and the 'Villain' are one in the same?

This is the birth of a God of Theatre, with the entire world as his stage, 'Mordred' plans for a global play to begin. The actors have all been set, the pieces are defined and there is the scent of blood in the air. Would the world resist him to the very last? Or will they succumb to his villainy and false heroism?

Yet, Mordred wasn't always like this. Indeed, until recently he had only been a shut-in with very little prospects for the future. His only talents was being good at a certain game. That is, until he had received a mysterious message that read: "Welcome to Aria". With the powers of his Game Character he was forced onto this surreal world of fantasy, and thus was born the greatest Devil known to all life, yet publicly he was known as the most benevolent Saint.