The world ended... but not really.
The current world we know is just a game made by elves.
Driskoll became a bugged NPC out of sheer coincidence and is ""respawned"" into a new world with his memories intact.
Inspired by a bunch of mangas, mostly Overlord, RE: Monsters and The Gamer
Edit: The original timeline has been split as a separate story. Please click the link below.
http://royalroadl.com/fiction/8103