The Gentleman's Guide to Vampires: Clan Lasombra

In which the gentleman in question provides you with an examination of the Clan of Night. The Lasombra. The Lasombra would have you believe (by force, if necessary) that they are rulers of the damned and the most powerful clan in the Final Nights. They would tell you that they can wield darkness as if it were tangible and can control the thoughts of all lesser beings (basically any beings other than themselves). How much of what the Lasombra say is true, and how much of it is clan propaganda?