Straight from Castle Age!
Land of Earth will be going live on Thursday, Nov 8th. It will remain in beta mode while the developers actively tweak the rewards and losses.
-Within the Land of Earth, it now costs essence for Officers to opt into a battle. -Defeating all defenders within a tower and destroying its crystal now gives rewards of essences and guild XP to the guilds that contributed the most (Maximum 50 Guild XP and 400 essence) -Failure to destroy a tower's crystal that you have attacked (or failure to defend your tower) will result in the loss of guild XP and essence for the guild at risk.