Gauntlet of Rassilon

 was a weapon used by Lord President of the Time Lords, Rassilon.

History
Rassilon's gauntlet contained De-mat technology that let him remove objects and individuals from history if he so wished. (PROSE: Engines of War) These same abilities allowed him to revert alterations to history. (TV: The End of Time)

Rassilon used the glove to disintegrate a Time Lady when she told him it might be better that the Time Lords died. Along with other Time Lords, Rassilon escaped the Time Lock and travelled to Earth. He used the gauntlet to destroy facial template set upon the humans. He then also attempted to kill both the Master and the Tenth Doctor, but failed to kill either. (TV: The End of Time)