The fortress is home to 40,000 people, who have largely forgotten that it was founded to plug a hole the formorians were using to stage invasions from the Underdark. Description of the city, its defenses, the Citadel Arcanum, architecture, laws and enforcement, city denizens, Includes new monsters: the barrier sentinel (level 9 soldier), Mithrendain guard (level 2 soldier), Mithrendain guard captain (level 5 soldier [leader]), watcher of the night (level 2 elite lurker); and stats for several notable figures including the Lord Marshal of the secret police (Amon Bassari, level 17 elite lurker [leader]), a member of the city council (Vyndra Sysvani, level 8 elite artillery), and an innkeeper (Kagen the Blackknife, level 6 elite skirmisher). Also contains new powers for fighters and wizards of the city, new paragon tier feats (fey step trailblazer, reactive fey step), a new paragon path (watcher of the night), and new magic items: Mithrendain steel weapon (level 8+), eldritch serpent armor (level 4+), shield of the barrier sentinels (level 9+), and the watcher's signet (level 11).