From publisher blurb:
The Darkfall is without question the greatest, most significant threat that has ever faced the world of Aden, and despite the heroic struggle put forth by the peoples of the Known Lands, the Darkfall may still emerge victorious. As if this were not enough, there are a great many evils in Aden beyond the Darkfall, and the most insidious of them are not supernatural forces, but the fellow men and women who dwell within the world with its adventurers.
Villains of Aden is a sourcebook for Thunderscape: the World of Aden that introduces twelve new figures of renown from throughout the Known Lands. From the simple but deadly threat of Durreal the Bloody, a ruthless vigilante patrolling the Sundered Desert of the Rhanate, to Lord Marlek Urbane, the Iron Tyrant of Urbana, these are foes that can change the scope of any campaign simply by their appearance within it.