Castle Drachenfels is a ruined fortress located in the Grey Mountains, which form the border between The Empire and Bretonnia. For centuries the castle was an all but unassailable stronghold for Constant Drachenfels, the Great Necromancer.
Following the apparent defeat and death of Constant by Oswald von Konigswald the castle's garrison was put to the sword by an army sent by Emperor Lutipold. The castle itself was to be razed but Oswald intervened, wanting to peserve the castle as a reminder of his great victory.
25 years later, the castle was the stage of the Oswald affair, a devious plot to assassinate Emperor Karl Franz and most of the Electors. The plot was foiled only at the last moment and the castle was later razed.
The ruins are currently all but abandoned and largely avoided.