From WoWWiki
| Permafrost
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| Increases the duration of your Chill effects by n sec and reduces the target's speed by an additional (3n + 1)%
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| Usable by
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| Class
| Mage
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| Properties
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| Location
| Frost, Tier 2
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| Affects
| Chill effects
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| Ranks
| 3
|
| Requirements
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| Points required
| 5
|
Permafrost is a mage talent that increases the effectiveness of the mage's chill effects, increasing the duration by 1 sec. per rank, up to 3 sec. max, and reduces movement speed by an additional amount, up to 10% at max rank 3. The additional reduction to movement speed is an additive amount, meaning that a snare that normally slows by 50% will now slow by 60%. This talent is popular with frost mages that do a lot of kiting, either against single mobs or when doing frost AoE grinding on multiple mobs at once.
Some spells gain a particular advantage from the increased chill duration. Blizzard, with points in Improved Blizzard normally has a chill of 1.5 seconds, which is increased to 4.5 seconds with Permafrost, three times the duration. Cone of Cold normally has a chill duration of 8 seconds, which is increased to 11 seconds with Permafrost, making the duration longer than the spell's cooldown of 10 seconds.
| Rank | Chill duration | Additional snare
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| 1 | + 1 sec. | + 4%
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| 2 | + 2 sec. | + 7%
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| 3 | + 3 sec. | + 10%
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