The lost city, the strong hold for the vampires said to be a myth by most races is an almost impregnable fortress that moves, the entire city is a moving fortress, protected by sacred magic cast by the first vampire Lord. The city ironically runs off sunlight which is passed through crystals which act as generators and distribute power throughout the fortress, it boasts multiple cities, artificial lakes, forests etc. Many adventurers see it as the ultimate challenge to find this monolith of a structure... None have found it