The Ancient Horologe was a very delicate instrument linked to time itself. It measured the passage of time across different dimensions. It was crafted like an ornate clock by the master chrono-smiths from the older worlds and given to Lord and Lady Tubbs as a wedding gift by the Tenth Doctor. It had pride of place in the Clock Room of Croxton Hall. It was damaged when a thief dropped it in a scuffle with Lord Tubbs. As a result, a fracture in time was created, displacing those nearest to it into a different kind of time. (COMIC: 13 O'Clock)