Signet of Synergy

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

Skill Trainers:
 * Tohn at Kamadan, Jewel of Istan

Profession Changers:
 * Core
 * Profession Changer (NPC) (Great Temple of Balthazar)
 * Nightfall
 * Zuwarah (Command Post)