Ride the Lightning

Acquisition
Signet of Capture:
 * Kunvie Firewing (Unwaking Waters (Explorable))

Trivia

 * Probably a reference to Ky Kiske's "Ride the Lighting" super from the Guilty Gear series of fighting games, as it has almost exactly the same effect. Both these skills are likely named after the Metallica song of the same name.