Lightning Orb

Acquisition
Hero Skill Trainers: Skill Quests: Skill Trainers: Profession Changers: Signet of Capture:
 * Nightfall
 * Shiloh (Sunspear Great Hall)
 * Prophecies
 * The Ascalon Settlement (North Kryta Province)
 * Factions
 * Locate Ronsu (Shing Jea Monastery)
 * Prophecies
 * Sorim (Quarrel Falls)
 * Master Scout Kiera (Henge of Denravi)
 * Dakk (Ember Light Camp)
 * Nightfall
 * Tohn (Kamadan, Jewel of Istan)
 * Core
 * Profession Changer (NPC) (Great Temple of Balthazar)
 * Factions
 * Senji (Senji's Corner)
 * Nightfall
 * Zuwarah (Command Post)
 * Prophecies
 * Claw Fleshfixer (The Great Northern Wall)

Trivia

 * The concept of an "orb of lightning" is probably derived from the phenomenon known as Ball Lightning.