Gaia comes to you one night and challenges you to defeat three other kingdoms. All four elements are present. Take Gaia's city and win over the others to become her champion!
This is basically a "kill all other players" senario with the bonus of a city in the center that holds extra settlements and runes. You have to fight your way into it.
This is, also, an anti-rush map. You cannot get to the other cities physically without fighting Gaia's center. This can be played 1v1v1v1 or 2v2.