Aion takes place in Atreia, a stunningly beautiful and world split in two.
Once connected by the Tower of Eternity, Atreia was sundered by an ancient cataclysm. On your journey to bring salvation to the world, your character will traverse the inner surface of Atreia, exploring lush lands, floating islands, chaotic voids, and many other amazing vistas.
Each half of the shattered world is inhabited by one of two playable divine factions: the Elyos and the Asmodians. Isolated by the Cataclysm that broke Atreia apart, each side has brooded for centuries on the catastrophic events of the past. Their hatred for each other has only intensified.
Many centuries after the Cataclysm, fragments of the destroyed Tower began to float mysteriously in the air, and investigations revealed unstable portals that opened into a dimension of darkness and wonder where fragments of the Tower drifted. This place was named the Abyss. Within the Abyss, the once-lost power of flight is now commonplace. The Abyss is where Elyos and Asmodians contend to fight an epic battle for supremacy.
As the Elyos and the Asmodians uncovered new, more stable portals to the Abyss, they encountered a primeval terror that they had known only in storybooks: the Balaur. Banished to an unknown dimension during the Cataclysm, the Balaur are the ancient enemy of all the peoples of Atreia. The Balaur's continual war on humanity led to Cataclysm. Now they have returned, the survival of both races and Atreia itself is more uncertain than ever.