Orichalcos Stone The Orichalcos Stone is the crystal that powers " The Seal of Orichalcos " in the " Waking the Dragons " arc , named for the legendary material " " featured in one of Plato ' s dialogues which also contained the characters " Critias " and " Timaeus " . They were created by The Great Leviathan . Features . To wield a fragment of the stone , the owner must be deemed worthy by it . If so , they are able to hold the stone in their hand and be granted great power . If they ' re not , their souls are taken by the stone and fed to the Great Leviathan . The stones are maintained by the darkness within the owner ' s heart , just like the Seal of Orichalcos magic card . The darker the owner ' s heart , the more power he can access . But , if they overcome the darkness , the stone will shatter to pieces . While under the influence of the Orichalcos , their minds are warped with psychological disruption which causes them to lose their personal self to the darkest abyss . It may also change the way people view other things differently such as when Mai changed her outfit from white and purple to black leather and purple while she was possessed . While Yami Yugi activated the Seal of Orichalcos , his personality became heartless and cruel which explained the reasons his revived monsters felt betrayed ; but , Yugi ' s changed personality while playing the same card that Yami used against Rafael was derisive and cruel which also described as a cunning sociopath ( which basically opposite of Yami ' s reflection ) claiming Yami ' s defense strategy was useless since Yugi ' s monsters gets a power bonus due to the Seal ' s effect ; which wanted Yami to feel the same pain they suffered at the hands of his betrayal . Yami tried to reason with Yugi not to make the same mistake he did in his recent actions ; but Yugi considered his reason as a sign of weakness which show no remorse for him and continue to attack him as a possible mark of revenge ( but , this is the only way to emancipate Yami ' s heart from the darkest abyss ) . While playing the Seal of Orichalcos with or without the stone , their Dueling style and strategy becomes brutal and violent ; that they can lose reason to use their own will to Duel like Yami Yugi did when he Dueled against Rafael ; he begins to disrespect his cards and sacrifice his own monsters using " Catapult Turtle " in order to win ( which in fact both Yugi and Yami Yugi didn ' t allow to use it for the entire Duel in the past like the Battle City Tournament and Noah ' s Virtual World , because they only rely on a true new strategy instead of using sacrificing monster for a direct attack on his opponents to win ) . Yugi also uses this strategy in order for Yami Yugi to counter this monster sacrifice which can release him from the Orichalcos ' malignant influence which in fact corrupted him and the darkness that dwells in his heart . The people who are chosen by the stone acquire strength and mystical powers that rival the Millennium Items . They have the power to materialize " Duel Monsters " cards . When inside the seal , it even allows the owner to control an Egyptian God . When the stone is thrown to the ground , it summons one or more Orichalcos Soldier s . A wielder of a stone can also destroy the soldiers at will , like Valon did to spare Joey Wheeler . They also have the power to unlock and dispel " The Seal of Orichalcos " , but only from the outside , and at the risk of the owner ' s soul . Other abilities include casting illusions , teleportation , and showing mental visions .