Whirlwind

Acquisition
Skill Quests: Skill Trainers: Signet of Capture:
 * A Heart of Ice (Yak's Bend)
 * Firstwatch Sergio (Lion's Arch)
 * Dakk (Ember Light Camp)
 * Spasmo Thunderbolt (Diessa Lowlands)
 * Flint Touchstone (Old Ascalon)

Related skills

 * Teinai's Wind
 * Thunderclap