Cronohera

 Cronohera is a city that is constantly in mid darkness. The sun never shines there and Cronohera has become a ghost town. The Dark Obel clan's mansion is located here so no one can ever track down where they are. Many if not all dark clans are located here. Only mages know Cronohera exists. Non magic users don’t. Cronohera don’t appear on regular maps. It only appears on magic maps that are only visible to mages. Trains don’t stop at this town. The only way to get here is to stumble upon it.