Instantly shocks the target with frost, causing X to Y Frost damage and slowing movement speed to 50% of normal. Lasts 8 sec. Causes a high amount of threat.
Instantly shocks the target with frost, causing X to Y Frost damage and slowing movement speed to 50% of normal. Lasts 8 sec. Causes a high amount of threat.
There is only one kind of cold the dwarves of Dun Morogh fear.
In addition to its significant direct damage (which is instant cast and does not reset the shaman's melee attack), frost shock also snares the target. In PvE, it's useful against runners, slowing their retreat if the shock doesn't kill them outright. It can also be used for kiting high level mobs in certain raid situations (Coilfang Striders for example). Against ranged opponents (in PvP, casters and hunters), the shaman can use this power to stay up close to use melee. Against melee classes like warriors and rogues, shamans use this ability to maintain their distance.
Concussion increases its damage by 1, 2, 3, 4, or 5%.
Reverberation reduces the cooldown of all Shock spells by 0.2, 0.4, 0.6, 0.8 or 1 second.
Elemental Focus its critical strikes has a chance to put the casting Shaman into the Clearcasting state which reduces the cost of the Shaman's next 2 damage or healing spells by 40%.
Elemental Fury increases its critical strike damage by 20, 40, 60, 80 or 100%.
Elemental Precision increases its chance to hit by 1, 2 or 3% and reduces its threat by 10, 20 or 30%.
Booming Echoes reduces the cooldown of both Frost and Flame shocks by an additional 1 or 2 seconds, in addition to increasing damage dealt by both spells by 10 or 20%.
While active, Elemental Mastery will increase its critical strike chance by 100% and reduce its cost by 100%.
Previously, Frost Shock was considered the "I win button" of Shamans, owing to the ability to permanently snare other players, such as in the prior entry:
With a ridiculous combination of high-damage, an instant cast, an eight-second effect, and a six-second cooldown, it would be foolish not to constantly Frost Shock other players or mobs until a win occurs. Once they are within melee range, drop an Earthbind Totem against melee mobs/players (or grounding for casters) and hack away for an easy win.
With both Reverberation and Booming Echoes, as well as a Glyph of Frost Shock, this spell can reach a 10 Second duration while only having a 3 Second cooldown. This allows one to defeat nearly any effect which breaks it in PVP, as the majority of trinkets and abilities which do so are on relatively long cooldowns. One can also cast Flame Shock without disrupting the snare, to add additional damage when kiting.
Patch 2.3.0 (2007-11-13): Frost Shock is no longer subject to diminishing returns.
Patch 1.6.0 (2005-07-12): Targets that are immune to movement slowing effects will no longer be affected by Frost Shock's movement slowing effect. Damage will still be caused.
Patch 1.4.0 (2005-05-05): Now subject to diminishing returns in PvP. This is considered a slowing effect.
Edit
Patch 2.3.0 (2007-11-13): Frost Shock is no longer subject to diminishing returns. 
