One of the other librarians mentions that the 'Lords of Terror' was also a name given to the Witch Lords, and hands you a hefty tome.
@History:
900 DR, Galaghard 3 Accedes and fights the Witch Lords, a campaign that takes half the nobles of the Glory of Corymr to their final fates. The greatest battle occurs within the Vast Swamp, where elven stag calvary buttressed the Cormyrian effort toward a hard - won victory.