The Great Leviathan



The Great Leviathan is the Orichalcos god exclusive to the "Waking the Dragons" story arc.

Dartz, the king of Atlantis was brainwashed by the Orichalcos and told to resurrect The Great Leviathan using human souls only to be defeated by the three Legendary Dragons, sinking Atlantis in the process. Like Zorc Necrophades, the Leviathan is pure evil and seeks to destroy the human race. It is by far the largest monster ever seen in the any of the Yu-Gi-Oh! animes, dwarfing the Egyptian Gods, Earthbound Immortals, Meklord Astros, King of the Netherworld, and Red Nova in size. In order to resurrect the Leviathan, Dartz would need the souls of the three Duelists that hold the Legendary Dragons cards: Yami Yugi, Seto Kaiba, and Joey Wheeler.

Ultimately, Dartz gave up his own soul to resurrect the Great Leviathan after he was unable to acquire Yami Yugi's soul (saying that his soul was one of "equal" value). Although it overwhelmed the Legendary Dragons and an army of monster spirits Yami managed to draw in the light in the souls the Leviathan absorbed and used that light to release the three Egyptian Gods. In a battle in the skies over the ocean, Yami Yugi and his Egyptian Gods faced off against the great beast. While the Leviathan was seemingly more powerful than even the three Gods, they were able to destroy the creature, for the light that fueled their power was greater than the darkness that coursed through the Great Leviathan.

Later, Yami Yugi was able to release the Orichalcos's dark influence from Dartz. Atlantis then returned to the bottom of the sea.

It should be noted in the flashback of the Battle of Atlantis, the Great Leviathan appears to be smaller and not as large as it was when it was revived 10000 years later. If so, it could be due to not having as many souls to empower it the first time, as Dartz states he had collected millions of souls by the time of the Leviathan's rebirth and is unlikely to have been able to claim as many from his fellow Atlanteans alone. Also it could be due to the Leviathan being weakened from several battles (it is implied there was more than one battle during the Atlantis conflict). As Critias and Hermos aren't seen during the flashback, it is possible they were defeated prior to the battle.