Dragon Slash

Acquisition
Signet of Capture
 * Factions
 * Seaguard Eli (Boreas Seabed)
 * Sskai, Dragon's Birth (Boreas Seabed (explorable area))
 * Eye of the North
 * Byndliss Flamecrown (Magus Stones)

Trivia

 * The skill icon appears to feature a Dadao Sword.