The Moment

The Moment was used by the Doctor to facilitate the end of the Last Great Time War. (TV: The End of Time)

The Eighth Doctor created the Moment from a modified De-mat Gun during the War. The Doctor then used it to end the war, time-locking it in the process. When the Doctor used the Moment, he destroyed Gallifrey, the Daleks, and the Time Lords. (COMIC: The Forgotten, Don't Step on the Grass, TV: The End of Time)

The Ninth Doctor later stated that all the combatants of the Time War had burned and been "wiped out in one second". (TV: Dalek)