Aion (Korean: 아이온: 영원의 탑, also known as Aion: The Tower of Eternity) is a massively multiplayer online role-playing game (MMORPG) released by NCsoft. The game combines PvP and PvE (a concept the developers call PvPvE) in a fantasy game environment. As of May 20, 2009, Aion had 3.5 million subscribers in Asia. AION's first major expansion pack was released to North America and Europe on September 7, 2010 under the name AION: Assault on Balaurea. On February 29, 2012 AION became free-to-play in Europe with a limited set of options regarding gathering, trade and chat, while North American Truly Free launched on April 11, 2012 with no such restrictions.