Black Tower

From Tardis Wiki, the free Doctor Who reference

The Black Tower was Marton Dhal's tower built on a rock outcrop in Raven's Tor on Avalon. The tower was Marton Dhal's base of operations, and as such was destroyed by Nyborg's Earth Empire fleet when they detected that Dhal's attacks on their personnel were coming from the tower. (PROSE: The Sorcerer's Apprentice)