Frostbolt

Frostbolt is a mage spell that deals frost direct damage and chills the target, slowing its movement speed. This spell is the primary source of damage for a frost mage.

Improvements
Piercing Ice increases critical strike chance. Master of Elements will refund a percentage of the mana cost of the spell if it critically hits its target.

The chill component of Frostbolt is affected by Permafrost, which increases the duration of the snare to 12 seconds, and increases the snare to 50% of movement speed.

As with all mage spells capable of critical hits, Molten Fury, Piercing Ice and Shatter can increase the effective damage output of this spell.

Impact from the Fire talent tree will work with any spell, including Frostbolt. With Frostbolt's snare and possible root effects, this additional stun can help further slow down one's opponents.

Lastly, Glyph of Frostbolt increases the damage it deals by 5%.