Irresistible Blow

Acquisition
Skill Quests: Skill Trainers:
 * Prophecies
 * Securing the Vale (Yak's Bend)
 * Prophecies
 * Firstwatch Sergio (Lion's Arch)
 * Dakk (Ember Light Camp)
 * Factions
 * All Factions skill trainers (except Zhao Di and Xu Fengxia)