Way of the Empty Palm

Acquisition
Signet of Capture:
 * Ilidus of the Empty Palm (Boreas Seabed (Explorable))
 * Senkai, Lord of the 1,000 Daggers Guild (Boreas Seabed (Explorable))

Trivia

 * Karate means Way of the Empty Palm, so this may be a reference to Karate.