The Shadow Paladin (シャドウパラディン) is a clan from the United Sanctuary nation. They are the evil counterpart of the Royal Paladins. Unlike Royal Paladin's theme of powering up your allies, this clan focus on sacrificing its own allies for high power, as seen in Phantom Blaster Dragon's "Damned Charging Lance".
Ren Suzugamori uses this clan both in the anime and manga. Aichi Sendou uses his own Shadow Paladin deck (given by Ren) while he is under the influence of PSY Qualia.