The Rock

The Rock, sometimes known as the Tower of Angels, is the fortress-monastery of the Dark Angels. To this surviving portion of their former home world Caliban they have added gun batteries, embarkation decks, and realspace and warp engines, transforming the Rock into one of the largest mobile battle stations in the Imperium. They have also explored the shadowed dungeons they found honeycombing the bedrock below. Here they discovered hoards of ancient machinery and weapons that had sat undisturbed since the Dark Age of Technology, as well as many more unsettling secrets that they have kept under careful guard ever since.