In Aion, players are divided between those that are "The Chosen” and those that are “The Fallen.” The Tower of Eternity exists as a gateway into the Abyss, and acts as a portal between dimensions. When a great evil opens the gateways, it awakens the Dragons imprisoned within the Abyss, who seek revenge on both worlds. It is here that an epic conflict begins, as you take your first steps on a journey to bring salvation to the world.

http://www.game.co.uk/Games/PC-Games/Aion-The-Tower-of-Eternity-Collectors-Edition/~r334820/