Signet of Synergy

Acquisition
Skill quests
 * Nightfall
 * Primary Training (Churrhir Fields)
 * Choose Your Secondary Profession (Churrhir Fields)

Skill trainers
 * Nightfall
 * Tohn (Kamadan, Jewel of Istan)

Profession changers
 * Core
 * Profession Changer (Great Temple of Balthazar)
 * Factions
 * Senji (Senji's Corner)
 * Nightfall
 * Zuwarah (Command Post)