The Ten Legendary Warriors (十闘士Juttoushi, lit. "Ten Warriors") are a fictional group of heroes from the Digimon anime series Digimon Frontier.
These Ten Legendary Warriors were the original Legendary Warriors of the Digital World, and are the members of the group of elemental heroes which saved the ancient Digital World by defeating Lucemon prior to the events of Digimon Frontier. They existed only in the distant past, and while they passed on their abilities to the various types of Digimon they preceded, they left their powers to the Celestial Digimon in the form of the Spirits.
Their heirs, the modern Ten Legendary Warriors, are divided both into two subgroups defined by their alignment, and into ten subgroups defined by the Ancient Digimon whose legacy they continue. Each of these ten subgroups consists of at least one Human Hybrid-level Digimon and one Beast Hybrid-level Digimon, and sometimes includes the Warrior's Rookie-level form, a half-beast, half-man Digimon produced when their Human forms lose power, their Hybrid-level Fusion-species (融合種 Yūgou-shu), which has inherited all the might of that attribute's original Warriors by combining its Human and Beast Spirits, or additional Human and Beast forms. The Warriors of Flame and Light also each have a Hybrid-level Transcendent-species (超越種Chouetsu-shu), who possess power that has surpassed even the might of the original Ten Legendary Warriors by combining the Spirits of five different attributes together.
The Ten Legendary Warriors (伝説の十闘士 Densetsu no Juttoushi) lived and died long before the DigiDestined came to the Digital World. In the farflung past, Human and Beast Digimon began a war against each other, but the war was ended when the angelic Lucemon descended to the Digital World to bring peace and order. However, his power corrupted him, transforming him from a benevolent and loving ruler into a tyrannical despot. In response, the Ten Legendary Warriors appeared, fighting Lucemon and managing to seal him away within the Dark Area.
At some point, AncientGreymon and AncientGarurumon also fought against the evil Ornismon, and managed to seal it away on the Lost Island. Island of the Lost Digimon
The war eventually took each of the Warriors' lives, but they managed to pass on their powers in the form of the Spirits, which they left to the Celestial Digimon—the Spirits of Wind and Light were given to Seraphimon, Fire, Ice, and Thunder to Ophanimon, and Earth, Wood, Water, Steel and Darkness to Cherubimon. This story and their full appearances are revealed to the DigiDestined by Baromon at the Tunnel of History. It Can't Be! Lucemon Reappears
During the DigiDestined's battles against the corrupted Cherubimon's forces, they were swept up by the Lost Island, where they discovered that Murmukusmonhad been keeping the war between Human and Beast Digimon running in order to reawaken Ornismon. With the help of Bearmon and Kotemon, the DigiDestined managed to temporarily revive AncientGreymon and AncientGarurumon, who quickly slayed the monstrous bird. Island of the Lost Digimon
The souls of the Legendary Warriors lay dormant within the Spirits, existing as silent partners to the DigiDestined, but they eventually reveal themselves during the final battle with Lucemon. Having taken on the personalities of the children who wielded their power, the Warriors encourage the DigiDestined, giving them the morale boost they need to evolve into Susanoomon, then eventually dealing the final blow to Lucemon Larva while in the form of their Human Spirits. In the wake of Lucemon's destruction, the path back to the Human World is fading, and so the Warriors throw their human counterparts into the closing portal. As the DigiDestined fly to their destination, they bid farewell and vow to watch over the Digital World in their place. End of the Line