From Shaiya Wiki
In ancient times, there was the Goddess Etain and the three races she created: the Dragons, the Nordein, and the Dumianas. The Goddess Etain found faults in the Nordien and cast them into the soil. In their arrogance, the Dumianas questioned the Etain's power and authority. The Goddess was weakened by their disbelief, and the Dumianas killed her. Her soul was torn in two. The death of the Goddess left Teos out of balance and unprotected. Other Gods sought to take over Teos and created monsters to invade and destroy it. The Dragons hid themselves from the world. When the dust settled, there were two new Goddesses overseeing Teos. The remaining Dumianas were split into two factions; one for each Goddess.
These two races, (deriving from the remaining Dumianas) came to be known as the Elves and the Vail, found themselves in constant conflict with each other. Age old tensions fueled their aggression. Soon after, Humans appeared and joined forces with the Elves while the Nordein re-emerged as the "Deatheaters" and allied with the Vail, creating two factions: The Alliance of Light and the Union of Fury. Not only battling the monsters that still roam the lands, these two sides wage a never ending war over the control of Teos.