Diablo

Diablo was the collective name for a Riding Roid army built by Placido. Unleashed towards the end of the preliminary rounds of the World Riding Duel Grand Prix, this army was an attempt by Placido to complete the Infinity Circuit through brute force. The plan was to switch the Duel Lanes to Battle Royal mode and force Turbo Duelist to fight multiple Riding Roids and the same time. Although opposed by Jose, he let the plan proceed, but in the end, Yusei Fudo, Jack Atlas, Bruno, Kazama, and likely other turbo duelists were able to overtake the Diablo and defeat all of the Riding Roids. One of the results of the attack was the delay (and near cancelation) of the WRGP final rounds, which resumed following repairs to the city.

Deck
During their duels, all of the robots used Allies of Justice to swarm the field and destroy opposing cards, assisted by Trap cards such as "DNA Transplant" and "Trap Jammer". Furthermore, the Diablo traveled in packs, outnumbering opponents by at least four to one and shared cards with each other to defeat all their opponents almost immediately. The primary card that showed up in their duels though was Ally Salvo.