Ice Armor

Ice Armor is a mage spell that grants a self buff which increases armor and frost resistance, and has a chance to snare attackers. Enemies that attack with melee have a chance to become chilled, slowing their movement and attack speed. This is an improved version of Frost Armor.

Talent Improvements
Frost Warding: Increases the armor and resistance bonuses of Frost Armor by up to 50% at max rank.

Permafrost (mage talent): At max rank lengthens the duration of the chill effect to 8 seconds and reduces enemy movement speed by a total 40%. Also, the chill effect can trigger the talent Frostbite.

Glyph Improvements
Glyph of Ice Armor: Your Ice Armor and Frost Armor spells grant an additional 50% armor and resistance.

Glyph of Frost Armor: Increases the duration of your Frost Armor and Ice Armor spells by 30 min.

Tips and tactics
The snare effect means never having to fight aggressive mobs you'd rather run past, assuming they don't resist every time. On foot, a chasing creature will get in 2 or 3 hits (some things run faster and swing faster than others) before you outpace them; mounted characters will be hit a single time before getting away. A very good thing to be able to do.