- You may be looking for the 67th century weapon.
Stasers had both lethal and non-lethal settings, and fired an unspecified type of directed energy. They were relatively harmless to inorganic matter but caused massive tissue disruption to living creatures. The corpse would be unrecognizable upon examination. (TV: The Deadly Assassin)
According to one account, a staser was a type of regeneration inhibitor, with a single shot being able to kill a Time Lord outright and ensure that regeneration could not take place. (PROSE: The Ancestor Cell) However, stasers could be modified to allow for regeneration, as the Eleven used to torture Volstrom by inducing multiple successive regenerations. (AUDIO: The Side of the Angels) Similarly, the sidearm of the President's personal security did not have a stun setting though a Time Lord shot with it could regenerate. (TV: Hell Bent)
Stasers were used as standard weapons during the Last Great Time War. Soldiers were expected to know how to build and maintain stasers. (AUDIO: The Conscript) Children in the First Segment of the War sorted out staser bolt chargers in munitions factories. (PROSE: The Stranger) Stasers were devolved into machine pistols on the Neverwhen planet front as a result of time phasing. (AUDIO: The Neverwhen)
Instances of use
Coordinator Narvin was given a staser for a mission in Earth's past. President Romana III forbid him from using it to stun or kill humans. He shot a wall to impress the local people and he promised to gift it to Sol in exchange for her help. (AUDIO: Intervention Earth)
Commander Roxita and his Capitol Guard used stasers in vain against the Vashta Nerada on Synthesis Station. Within the Doctor's TARDIS, the Eighth Doctor found that Roxita's staser had been infested by the Vashta Nerada. (AUDIO: Day of the Vashta Nerada)
During his invasion of Gallifrey following his banishment by the Doctor, Rassilon killed his successor as Lord President with a staser, reclaiming his gauntlet and the title of Lord President. (COMIC: Supremacy of the Cybermen)