The History of Eora, Volume IV: The Founding of Readceras is a book and quest item in The Forgotten Sanctum.
"...but the delemgan and adragan couldn't come to accords. They launched a quiet civil war, and the colonists' farms became the front. The adragan blighted the Aedyrans' vorlas crops with a mite native to the deep forest. The colonists, believing themselves under attack by the notoriously territorial delemgan, retaliated by clear-cutting the forests surrounding their villages. Not to be outdone, the delemgan drained the subterranean aquifers in the Vailian settlements..."
The Central Stacks: Bookshelf in the northern part of the Circulating Library, the right of the stone lecterns.