Energy blaster

These energy blasters were used by the Preachers on Pete's World to kill the Cybermen. They could easily blow off a Cyberman's head.

The Tenth Doctor modified some blasters to penetrate the heat shields and polycarbide of a Dalek. The blasters disabled the Cult of Skaro's weapons, though the Daleks quickly adapted and regained control of their weapons. (TV: Doomsday)

Upgraded versions of these guns were developed by the parallel world's Torchwood and used by Rose Tyler, Jackie Tyler and Mickey Smith. They fired a narrower, more opaque beam which could easily destroy a Dalek. (TV: The Stolen Earth / Journey's End)

The weapons room of Torchwood Three contained blasters, but the room was locked when Lisa Hallett attacked so they could not use them. (TV: Cyberwoman)

By the time the Cybermen joined the Alliance, they had incorporated similar weapons into their arsenal. The Cybermen accompanying the Cyber-Leader when the Doctor was imprisoned under Stonehenge carried the weapon, although the Cyberman guarding the Pandorica still used the blaster on its wrist (TV: The Pandorica Opens)

The weapon was still in use when the Cybermen organised into the Cyber Legions (TV: A Good Man Goes to War, GAME: The Eternity Clock) although they continued to use wrist blasters as well. (GAME: Blood of the Cybermen, PROSE: Plague of the Cybermen)