"Samurai Sword Baron", "Stygian Sergeants" and "Stygian Security" were released as promotional cards with Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia. "Stygian Street Patrol" was released as a promotional card with the game guide in the OCG, while it was released as part of the Duelist Revolution set in the TCG.
"Stygian Street Patrol" and "Stygian Sergeants" are characters in Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus.