Hermos Hermos was a legendary knight from Atlantis , who aided Ironheart in the Battle of Atlantis . Design . Hermos , like other legendary knights , is named after Plato ' s work . Hermos is named after from Plato ' s dialogues " " and " " . In his human form , Hermos wears red armor . Like the other knights he bears a similar facial expression to his chosen duelist , Joey Wheeler . His red color scheme follows him into his dragon form . Hermos has a " Duel Monsters " card form . The card , " Claw of Hermos " , along with its counterparts " The Eye of Timaeus " and " Fang of Critias " are unlike other cards . They have their own set of rules and are color coded blue . Although Monster Card s , the Dragons are played similar to if they were Spell Card s and can combine with other cards . Hermos can combine with monsters to form Equip Spell Card s . It has been shown to combine with five such cards ; " Big Bang Blow " , " Queen ' s Knight " , " Red - Eyes Black Dragon " , " Rocket Warrior " and " Time Wizard " to form " Big Bang Dragon Blow " , " Goddess Bow " , " Red - Eyes Black Dragon Sword " , " Rocket Hermos Cannon " and " Time Magic Hammer " . Biography . Ancient Atlantis . Hermos and the other legendary knights , Timaeus and Critias resided in the Spirit ' s World , until Atlantis became corrupt by the Orichalcos . Ironheart Summoned them to the human world , to help him defeat Dartz , who was trying to wipe out the population of Atlantis and start fresh . However Dartz weakened the knights by turning them into dragons . The Legendary Dragon s , fought alongside rebels from Atlantis and more Duel Spirits against Dartz , Orichalcos Soldier s and The Great Leviathan . The battle ended with neither side victorious and Atlantis sunk to the bottom of the sea . The Dragons were sealed in crystal prisons , until they would be needed again . Present time . Joey Wheeler was chosen as a Legendary Duelist to wield Hermos . During a Duel with Mai Valentine , he and Yugi were subconsciously taken to the Duel Monsters Spirit World , where they saw Hermos trapped in his prison . By removing a sword Joey set Hermos free and got the card " Claw of Hermos " , so that he may Summon " Hermos " while playing " Duel Monsters " . As a card , Hermos had the ability to combine itself with monster to create Equip Spell Card s . Joey used it to form " Time Magic Hammer " in his Duel against Mai . He also used it against Rex to create " Red - Eyes Black Dragon Sword " , against Valon to create " Rocket Hermos Cannon " and " Big Bang Dragon Blow " and in his second Duel against Mai to create " Red - Eyes Black Dragon Sword " again . After Joey lost to Mai , Mai had a change of heart stormed off to face Dartz taking the " Hermos " card with her . However she was confronted by Rafael , who defeated her and took the card . When Yugi arrived , Rafael gave him the card , before they dueled . Yugi used it in the Duel to create " Goddess Bow " . When Yugi and Kaiba faces Dartz , Yugi used " Legend of Heart " to change the dragons back to their true forms . Together with Timaeus and Critias , Yugi was able to defeat Dartz ' s " Divine Serpent Geh " and win the Duel . However The Great Leviathan , was Summoned again . Hermos took part in the battle against it , this time his side emerged victorious . He , Timaeus , Critias and Dark Magician Girl appeared on the beach to thank Yugi before returning to the spirit world .