Staser

From Tardis Wiki, the free Doctor Who reference

Staser weapons were the standard armament of the Chancellory Guard on Gallifrey. The Guards were normally equipped with staser pistols, although staser rifles were also occasionally used.

Usage

Stasers had both lethal and non-lethal settings, and fired an unspecified type of directed energy. They were relatively non-damaging to inorganic matter but caused massive tissue disruption to living creatures. (DW: The Deadly Assassin)

It would seem single staser shot could apparently kill a Time Lord outright and ensure that regeneration could not take place.

Stasers were ineffective against Sontaran armor. (DW: The Invasion of Time)

Staster pistols apparently come in different versions, those seen after the sontaron invasion are significantly larger then those seen previously. It is possible that as the older variety were ineffective against Sontaron armour, a newer more powerful version was issued to the Chancellery Guard.

Instances of use

Behind the Scenes

The visual effect of a staser bolt varies, and has been observed as a white flash at the victim, a green lance, or a green-white beam that cascades over the victim's body.