The Legendary Signer was a Signer, who lived 10 millennia before the current day events of Yu-Gi-Oh! 5D's. He possessed the full Mark of the Dragon on the left of his chest and wielded the Burning Soul ability.
Biography
Battle with the Crimson Devil
The Legendary Signer faces the Crimson Devil.
The Crimson Dragon and its servants: Ancient Fairy Dragon, Black Rose Dragon, Black-Winged Dragon, Red Dragon Archfiend and Stardust Dragon fought the Crimson Devil, Red Nova.
The Signer came forward from the ashes of a volcano and performed a miracle. He was able to absorb the Crimson Dragon's power, through Burning Soul, and used it to defeat and seal the Crimson Devil.
Post death
When Jack Atlas faced the Crimson Devil's servant, the Familiar, he spoke of Burning Soul, which reminded Greiger of the Legendary Signer. Using Burning Soul, Jack absorbed the power of the Crimson Devil and created the card "Red Nova Dragon", which he used to defeat the Familiar.
References
- Yu-Gi-Oh! 5D's episode 113: "Burning, Seething Soul! Scar-Red Nova Dragon"