Timaeus Timaeus was a legendary knight from Atlantis , who aided Ironheart in the Battle of Atlantis . Design . Timaeus , like the other Legendary Knight s , is named after one of Plato ' s , which are the source of many of the rumors pertaining to Atlantis . In his human form , Timaeus dons teal / green armor , and is characteristically missing one eye from a past encounter with Dartz . Like the other knights , he bears a similar facial expression to his chosen Duelist , Yami Yugi . Timaeus ' s humanoid color scheme continues into his dragon form , where he is also mostly teal . Timaeus has a " Duel Monsters " card form . The card , " The Eye of Timaeus " , along with its counterparts " Fang of Critias " and " Claw of Hermos " are unlike other cards . They have their own set of rules and are color coded blue . The Dragons were placed in the Monster Card Zone , but played similar to if they were Spell Card s and could combine with other cards . Timaeus can combine with monsters to form new monsters . It has been shown to combine with two such monsters , " Dark Magician Girl " and " Dark Magician " , forming " Dark Magician Girl the Dragon Knight " and " Amulet Dragon " respectively ( Yami attempted to combine Timaeus with " Poison Butterfly " , but it didn ' t work as Yami had lost Timaeus ' trust at this point ) . Biography . Ancient Atlantis . Timeaus and the other legendary knights , Critias and Hermos resided in the Spirit World , until Atlantis is corrupted by the Orichalcos . Ironheart Summoned them to the human world to help him thwart Dartz ' s efforts to wipe out the population of Atlantis in the misled hopes of starting the kingdom anew . However Dartz was able to weaken the knights by trapping them in the forms of dragons . The Legendary Dragon s , fought alongside rebels from Atlantis and other Duel Spirits against Dartz , Orichalcos Soldier s and The Great Leviathan . Timaeus successfully defeated a number of Orichalcos Soldiers . Dartz however teased his power , striking him with lightning and taking out his eye by means of the Sword of Kings . The battle concluded with neither side victorious , and Atlantis sinking to the bottom of the sea . The Dragons were sealed in crystal prisons , to be freed if need should ever arise . Present time . Yugi Muto and his other - self Yami Yugi were chosen as a Legendary Duelist to wield Timaeus . In a dream , the Yugis are taken to the Duel Monsters Spirit World , where they are taken to Timaeus , trapped in his prison . By removing a sword they set Timaeus free and get the card " The Eye of Timaeus " , so that they may Summon " Timaeus " while playing " Duel Monsters " . As a card , Timaeus had the ability to combine itself with Yugi ' s other monsters . He aided Yugi in his Duel against Rafael , but it was worried abandoned after Yami Yugi played " The Seal of Orichalcos " . After Yugi lost his soul , Yami Yugi tried to summon " Timaeus " against Weevil Underwood , but Yami was deemed unworthy after his transgressions in his previous Duel . Yami Yugi came into contact with the spirits of Ironheart and Chris . They helped Yami recover his self - esteem and ultimately allowed him to summon Timaeus again . Yami did such as he battled Dartz ' s minions . When Yugi faced Dartz , he used " Legend of Heart " to change the dragons back to their true forms . Together with Critias and Hermos , Yugi was able to defeat Dartz ' s " Divine Serpent Geh " and win the Duel . However , The Great Leviathan , was Summoned again . Timeaus took part in the battle against it , this time his side emerged victorious . He , Critias , Hermos and Dark Magician Girl appeared on the beach to thank Yugi before returning to the spirit world .