2Moons is updated by Acclaim using a series of "actions." Each action contains new updates, including things like glitch fixes, improved abilities (or completely revamped abilities), new armor/weapons, monsters, classes, etc. To date, there have been four "actions," with two scheduled for release. Actions are based on the Korean version of Dekaron, and are not all in order in 2Moons [3].
* Action 1 (nameless) Siege Battle was introduced. This was released after Action 2 in 2Moons.
* Action 2 (Dead Front) Released a few months after open beta. Introduced Dead front, several skills, and much more. Required a new client.
* Action 3 (Bad Moons Rising) Released a while after the second action. Updated high level maps such as Acquirai Ruins and the Space of Pilgrimage. Also introduced new weapons and armor.
* Action 4 (Expedition) Released a few months after the third action, and introduced Expedition and Nest of Kerubim.
Future Releases
* Action 5 (She is Aloken) To be released 2009, will include the new Aloken class and new abilities.
* Action 6 (Good Day to Die) TBA. Will include the "Demon Transformations," new skills, items, armor, weapons, and a new map entitled "The Deadlands."