Tear of Isha
From Tardis Wiki, the free Doctor Who reference
The Tear of Isha was a stellar manipulator. It was kept in the Omega Arsenal. Rassilon ordered the use of the Tear on the Tantalus Eye, in order to prevent a Dalek plan to wipe Gallifrey from history. This plan, and the use of the Tear, was prevented by the War Doctor. (PROSE: Engines of War )
