The Cruciform existed during the Last Great Time War. The Dalek Emperor took control of the Cruciform. The resurrected Master was so frightened, he ran away and used a Chameleon Arch to turn himself into Professor Yana and hide near the end of the universe. (TV: The Sound of Drums)
Behind the scenes Edit
The Cruciform hasn't been confirmed to be either a location, a weapon, a ship or some kind of object. It has only been mentioned, not described. The word "cruciform" means “cross-shaped”, and is, amongst other things, a type of real-life screwdriver.