The Twilight Kin are not a numerous people. They preserve their stock by making great use of the horrors and demons they feel such a connection to—something that is unthinkable and utterly alien to all outsiders. The void-twisted monsters formed by the shreds of their ancestors form the core of their armies, summoned with forbidden knowledge or ritual sacrifice.
The once proud and majestic city of Ileureleith was a hub of trade and academic sharing. A portal for the world to the lands and learning of the elves. Academics and mages from across the globe would make epic pilgrimages to the city to learn the secrets of the ancients, to philosophise and debate. Knowledge and wealth were not the only outcomes of this free intermixing of cultures, though. With it came strange ideas, different thinking, and a new curiosity.
– lore snippet from 3rd Ed. Uncharted Empires Supplement