Floating city center of map, BOSS: Imperator Jabaoth

http://www.youtube.com/watch?v=aheCxxpFbmw

Okay, so this video shows a couple of players exploring near the middle of the map. The first 18-19 minutes are just them riding by scenary and talking... when they come across a giant floating city in the sky. Whilst trying to find a way up they come across a very cool looking structure under the flying city which they go to inspect.

Skip to 19minutes in to see the boss mob.