Meet Dragon's Dogma's Ur-Dragon. He's sort of like a video game kickstarter, except that he doesn't need tons of gamers to fund him. He needs tons of gamers to kill him.
The Ur-Dragon, like some of the epic bosses in Infinity Blade II and other online-connected games, is an enemy that is designed to be slayed in an asynchronous group effort. According to the folks promoting this feature, players of the ostensibly single-player Dragon's Dogma will find this dragon somewhere in the game and will hopefully help to defeat it.