Quivering Blade

Acquisition
Signet of Capture:
 * Sun, the Quivering (Wajjun Bazaar)

Note: The Am Fah must be your enemy in order to encounter Sun, the Quivering. If they are your allies you must do the quest Seek out Brother Tosai and complete either the Drink from the Chalice of Corruption quests or the Refuse to Drink quest to the end.