Mage · Frost · tier 2 · from level 15
Permafrost
Permafrost
Rank 3/3
Increases the duration of your Chill effects by 33% and reduces the target's speed by an additional 10%.
Doesn't change the damage or healing of any Mage spell.
Averages, counting crits and misses, for a level 60 Mage with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.