Sonic stake

The sonic stake was a sonic device that Ikalla stated was an ancient Time Lord weapon.

The Ninth Doctor carried one around when he was on the planet Parvanna. When the two were attacked by a creature, the Doctor made the stake combust, in which the fire caused the creature of flee. (COMIC: Tales of the Dark Times)

Behind the scenes
The sonic stake was one of the collectable items that could be found in GAME: The Edge of Time's Time Lord Victorious update.