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The colosseum's ruins were located in [[Spartan City]] under a small lake, and its legend is well known to the Spartan City citizens. It is where the greatest gladiator to ever have existed battled using only his bare hands, and won every battle he fought. The gladiator was also the friend and rival of the prince of the land, who whom he battle battled with many times. During their final fight, the gladiator was framed by the people close to the prince, whom who saw the gladiator's possible victory unacceptable. The gladiator was placed under false charges, and despite his pleas of his innocence and the prince's support, the gladiator was executed.

According to [[Dextra]], the residents believed the ruins is were hunted by the gladiator's sprite spite because of his grudged of grudge against his unfair fate. Though [[Nistro]] believed the gladiator simply wishes wished to fight more and regret regretted that he never finish finished his battle with his rival. The ruins is was where "[[Number 54: Lion Heart]]" sleepsslept, protected by a large spirit in spartan Spartan warrior armor. [[Alit]] has had his own nostalgia from these ruins and the guardian also seems seemed to recognized recognize Alit when he explored the ruins.<ref name="ep103">{{episode|Yu-Gi-Oh! ZEXAL|103|ref}}</ref>