I copied this directly from
Arduinna's Website without her permission:
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Staff weapon
A long, spear-like weapon carried by Jaffa that uses an energy crystal for power and shoots a blast of very hot energy that can badly damage or kill (the blast is hot/high-energy enough that wounds can smoke or be self-cauterizing). First appear in the Stargate the movie appear in almost every episode thereafter.
The force of the blast is powerful enough to penetrate Kevlar, and the heat of the plasma is enough to superheat other bulletproof armor plating, effectively cooking the wearer.
Zat'nik'tel, zat'n'ktel ("zat" or "zat gun"):
Goa'uld weapon using a different form of energy from a staff weapon, shooting what amounts to an electrical charge. 1 shot disables/stuns with pain, 2 kills, 3 disintegrates.
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The Staff Weapon is listed elsewhere as primarily a "Weapon Of Terror" in that it's not very accurate at long range, and it's close-range effects are spectacularly lethal.
IMTU it has the same effects as a laser carbine, with the range limitations of a shotgun. Also, it's energy cell has only 5D shots remaining -- the referee is required to keep track of shots. The energy cell has no equivalent in Imperial Technology.
IMTU the Zat does 2D per shot, range as pistol. It does not disintegrate. 3D shots remaing when found. The energy cell has no equivalent in Imperial Technology.
IMTU Both the Staff weapon and the Zat are Ancient artifacts that are exceptionally rare, unless there is a player that gets a little annoying.
Give a player enough power, and they'll abuse it. This tends to attract the attention of the authorities, who will either "neutralize" the player's character, or demand that the weapon be surrendured.
Authorities can be very touchy about such things...