Onyxgate

Once a proud maritime port in the Shadowfell (paralleled by Abeulys in the MMP), Onyxgate is now an abandoned city patrolled by undead monsters.

Two hundred years ago, the Vampire Lord Count Bledsoe von Drenning's undead armies attempted to conquer Onyxgate, but its dedicated knights defended it, keeping it out of von Drenning's hands. Von Drenning, in a fit of fury, cursed the city, claiming that if he couldn't have it then no one could.

The proud knights turned into Soul Reavers (colloquially called Night Terrors), who terrorized the citizens, driving them underground. These people turned into ratfolk. The generation that was once human is long gone, but their descendants have nightmares about von Drenning.