The world of Gaia is home to three realms, each populated by thousands of players fighting an endless territory war. These nations, along with a comprehensive guild system, are the groundwork for truly grand military clashes. Guilds and nations can ally with each other in exciting Castle Sieges to gain control of a nation and lord over its subjects, while entire nations may scheme with and against each other to win epic wars where not just glory, but also valuable treasure and powerful ability enhancements are at stake.