Vocal Minority

Acquisition
Hero Skill Trainers
 * Shiloh (Sunspear Great Hall)

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

Trivia

 * Vocal members of an online community are often referred to as a "vocal minority", a phrase which entered circulation as part of Richard Nixon's "silent majority" speech.
 * 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.