"Chthonian" is a series of cards with the word "Chthonian" in their English card names. In the OCG, these cards had "Hell" (地獄) in their Japanese names, but not all "Hell" cards belong to this series. They were used by Chazz Princeton in the Yu-Gi-Oh! GX anime. The cards are thematically similar in art style and often utilize a control/beatdown strategy.