Heishin Heishin , known as Slysheen in " Yu - Gi - Oh ! Dark Duel Stories " , is the High Mage of the Amenhotep Dynasty . He is portrayed as an elderly yet megalomaniacal man set on acquiring the Millennium Items to gain a great power . Although he makes no appearance in the anime or manga , Heishin has played a prominent role in a number of video games based on the Yu - Gi - Oh ! series , often acting as the main antagonist in the initial stages of the game to be killed off and later replaced by a much more powerful villain . Although his role generally differs from one game to the next , his ambitions of grabbing power and glory remain the same . Dark Duel Stories biography . In " Yu - Gi - Oh ! Dark Duel Stories " , Heishin ( Slysheen ) is the third stage 3 opponent . He is unlocked by defeating all stage 2 opponents , at least five times each . Slysheen is a foe from ancient Egypt , and has plans of world domination upon defeating the player . Forbidden Memories biography . Heishin managed to steal six of the seven Millennium Items . Using this new found power , he invaded the palace and attacked Simon Muran with the Millennium Rod , while searching for the Millennium Puzzle . However Simon slipped the puzzle to the prince , encouraging him to take it and flee from the palace . Heishin stopped the prince and defeated him in a Duel ( if the prince managed to win , Heishin would repeatedly challenge him until he lost ) . Heishin attempted to claim the Millennium Puzzle , but he was held back by Simon who convinced the prince to it , resulting in the souls of the prince and Simon being sealed inside it for thousands of years . During the prince ' s absence , Heishin and the mages gained control of the metropolis and governed the land as they wished with no one to oppose them . After the prince returned and defeated the mages who guarded the Millennium Items , Heishin was betrayed by Seto , who led the prince to him . Heishin Dueled the prince and was ultimately defeated . However he secretly followed Seto and the prince to the Forbidden Ruins . As the ritual to summon DarkNite began , he held a dagger to Seto ' s throat claiming that he was aware of his treachery from the very beginning , but played along . Seto , being a descendant of a dark clan , whose membership was necessary to perform the ritual , made him a necessity in Heishin ' s goal . Threatening to kill Seto , Heishin convinced the prince to hand over the Millennium Items . With the seven totems gathered , he used them in the dark ceremony to call forth DarkNite . Heishin attempted to command DarkNite as per the pact , but DarkNite claimed no allegiance to Heishin and turned him into a card . Claiming the card to be one of the noisiest and ugliest cards he ever created , DarkNite said it did not deserve a place in his Deck and burned it . Deck . In " Forbidden Memories " , Heishin ' s Deck contained many powerful cards including " Perfectly Ultimate Great Moth " and " B . Skull Dragon " . The second time the prince faced him , he included " Blue - eyes White Dragon " and " Gate Guardian " in his Deck . " Exodia the Forbidden " can be won from Heishin , the second time the player faces him .