Golden Age of Necromancy
Between B.G.A. 3500 and B.G.A. 3000, for a period of roughly 500 years, Necromancy flourished and reached its greatest economic and social development. This period is known as the Golden Age of Necromancy, because everything gets a Golden Age.
The Necromancer culture was focused primarily on the Arcol Steppe and expanded outwards to include the Eanu Valley and the mountains called the Teeth of the World. It was likely during this time that the Feast of Aeons was constructed.