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)

However, due to much of the ambiguity surrounding the Last Great Time War, there is a possibility that the unknown Doctor introduced in The Name of the Doctor (TV story) could have possessed the Moment. There are various clues in the words he speak to suggest this.