Mantra of Frost

Acquisition
Skill Quests: Skill Trainers:
 * Helping the Dwarves (Yak's Bend)
 * Firstwatch Sergio (Lion's Arch)
 * Dakk (Ember Light Camp)

Usage

 * This skill is useful in PvE, where you know ahead of time that your opponent will (or will not) be using Cold damage.
 * This skill is particularly handy for Ranger/Mesmers or Mesmer/Rangers, because when combined with Winter, all elemental damage you would suffer will be greatly reduced and result in a very useful energy gain.