The Great Leviathan The Great Leviathan , or the Orichalcos God in the Japanese Version ( also dubbed the Grand Dragon Leviathan in English advertisement media ) was the deity of the Orichalcos and the main antagonist of the Waking the Dragons arc . Design . Appearance . The Great Leviathan ' s size varies ; during the Battle of Atlantis , the Great Leviathan appeared to be smaller than it was when it was revived 10 , 000 years later . After its revival , the Leviathan was large enough to wrap around the island of Atlantis twice , and it dwarfed the Egyptian Gods ; its head was around the size of the average God monster . If so , it could have been due to not having as many souls to empower it the first time , as Dartz stated that he had collected millions of souls by the time of the Leviathan ' s resuscitation and could not have been able to claim as many from the Atlantean populace alone . It could also potentially be due to the Leviathan being weakened from the prolonged hostilities ( it was noted that there was more than one battle during the Atlantis conflict ) . As Critias and Hermos were not present during the flashback , it was assumed that they were defeated and sealed prior to the final battle . The Great Leviathan is a purple serpent with a pink belly . It has ruffles of teal fur over its body , including its forked tail and as its membranes . Its massive head has long jaws with an underbite and simple teeth ; two small , pink mandibles protrude midway along the bottom jaw . The head and bottom of the lower jaw are coated with a grey carapace ; the crest has six spikes , five pointing back and one pointing forwards . The Leviathan has small yellow eyes ; Dartz exhibited these when he was merged with it . Abilities . The Great Leviathan was an extremely ancient and powerful entity , and was the one responsible for the creation of the Orichalcos Stones , which in turn , granted wielders immense knowledge and greed . Hence , it was responsible for the Atlanteans to degenerate , corrupting their personalities , which could be reflected as when the citizens turned into hideous monsters . It was also capable of removing souls from both humans and Duel Spirits on a global scale , absorbing them physically in order to absorb their souls and used tentacles from its substance . Much like Zorc , the Leviathan was said to have been born through the hatred and rage of humanity , and it was even considered to " not " be a Duel Spirit , such as the Egyptian Gods ( In the Japanese Version , it was later sent to the Duel Monsters Spirit World ) . It was capable of usurping control of the Egyptian God Cards as well draining their power , similar to when Zorc created a solar eclipse . The Leviathan ' s powers stemmed from the darkness of human souls and captured souls themselves . Via that source , the Great Leviathan was shown to have immense offensive and defensive powers during the final battle . Its mere presence was capable of creating a storm of global proportions . The Great Leviathan had singlehandedly and simultaneously defeated up to twelve powerful Duel Monsters who fought together , including Blue - Eyes Ultimate Dragon and all three Legendary Knights , while it remained unharmed from all of their attacks . It was capable of blasting numerous shards that could defeat extremely powerful Duel Monsters in a single hit . The Great Leviathan ' s body could be subdued or destroyed , but its spirit could not be defeated conventionally ; its physical body was defeated through Yami Yugi ' s conversion of humanity ' s darkness into light which was channeled into the attacks of the Egyptian Gods . It was finally destroyed when Yami Yugi vanquished the last of his negative emotions through his good memories and friendships . Biography . Dartz , the king of Atlantis , was brainwashed and manipulated by the Orichalcos Stone and told to resurrect their god , the Great Leviathan , by using human souls . It was defeated by the three Legendary Dragon s , though Atlantis was sunk in the process . Like Zorc Necrophades , the Great Leviathan was pure evil and wanted nothing more than the extermination of all life on Earth . In order to resurrect the Leviathan , Dartz needed the souls of the three Duelist s who wielded the Legendary Dragons cards : Yami Yugi , Seto Kaiba , and Joey Wheeler . As more souls were collected , the Leviathan became more and more active , especially as the souls of the Chosen Duelists were collected . After the capture of Joey ' s soul , a manifestation of the Leviathan began to appear in the sky across the world , and by the time that Kaiba ' s soul was captured , it was conscious enough to roar from within its astral prison . Ultimately , Dartz gave up his own soul in order to resurrect the Leviathan after he was unable to acquire Yami Yugi ' s soul ( Dartz said that his soul was one of " equal " value ) . Although it overwhelmed the Legendary Knights and an army of monster spirits , Yami managed to draw in the light in the souls that the Leviathan absorbed , used that light , released , and called out the three Egyptian Gods . In a battle in the skies over the ocean , Yami Yugi and the Egyptian Gods faced off against the Leviathan . While the Leviathan was seemingly stronger than even the Gods itself , Yami Yugi greatly powered the Egyptian Gods through the light of the captured souls , which proved to be the Leviathan ' s weakness . Hence , they were able to neutralize the Leviathan for the light that fuelled their power was greater than the darkness that coursed through the Leviathan . Later , Yami Yugi was able to release Dartz from the Leviathan ' s malignant influence : He did that by using his own light that was represented by the vessel of a memory container to destroy all of the hatred and resentment from the world that powered the Leviathan and vanquished it for good . In the Japanese Version , Dark Magician Girl mentioned that the Leviathan was sent by her to live in the Duel Monsters Spirit World , when the curse of the Orichalcos was extinguished . Atlantis then returned to the bottom of the sea .