Aion is an MMORPG by NCSoft with a unique PvPvE system using the first CryEngine. Originally released in Korea, it was relaunched for China, Japan, Taiwan, North America and Europe in 2009. There are six subclasses, and eleven main classes in the game. Players start the game by choosing one of the six primary classes: Warrior, Mage, Scout, Priest, Technist or Muse. After attaining level 10, the player must choose from two specialized classes associated with their chosen class (with the exception of Muse, which at the time can only ascend to a Songweaver). Warriors may become a Templar or a Gladiator; Mages may become a Sorcerer or Spiritmaster; Scouts may become an Assassin or Ranger; Priests may become a Cleric or a Chanter; Technists may become a Gunslinger or Aethertech; and a Muse will become a Songweaver. The PvPvE gameplay of Aion revolves around battles within the Abyss and Balaurea (PvP zones). Within these zones are fortresses which can be controlled by individual Legions (the Aion equivalent of Guilds). Battle to control these castles involves combat against players of the opposing faction and computer controlled NPCs at the same time, using siege weapons obtained from PvE raid content.