Vocal Minority

Acquisition
Hero Skill Trainers
 * Shiloh (Sunspear Great Hall)

Skill Trainers:
 * Tohn (Kamadan, Jewel of Istan)

Trivia

 * The name of this spell could be a reference to Alex Weekes' forum post on GuildHall.net where he addressed the PvP community as a Vocal Minority.