The War of Horrors
The Dhakaani Empire was a mighty goblinoid nation that dominated most of Khorvaire roughly 15,000 years ago. During the Daelkyr War, the empire fought against invaders from Xoriat, the Plane of Madness. Although the Gatekeeper Druids eventually won the war for Eberron, the empire had exhausted its martial and civil resources during the conflict. Weakened and bankrupt, the empire fell approximately 5,000 years before the current era.