Card Lores:Two-Headed Evil God Bishop, Joker Gastille

He is Gastille, the leader of the Apostles who sought to resurrect the Dragon Deity of Destruction, Gyze. Using the extradimensional afterlife space Relics, he succeeded in resurrecting Gyze, but in the final battle between the forces of Gyze and Messiah, he was defeated by Shiranui, Amaruda, and Dumjid, who he had manipulated into assisting him, and Gyze itself was defeated by Chronojet Dragon Z. Gastille dissipated into mist and was trapped within Relics, his soul destroyers.

He is also Gastille, a demon lord slain by Night Hunter during their earliest days. After hearing of a dispute on the island of Sonne Grab close to their territory, Abyss Shatter Dragon and his hunters discovered the Blue Demon Lord and the Black Demon Lord gearing for war. Manipulating both sides, Night Hunter caused both sides to destroy the other, after which Gastille and the Black Demon Lord were sentenced to death and executed. Gastille cursed the hunters with his last breath. However, unlike the grudge of the Black Demon Lord in the main timeline, Gastille's curse failed to do anything due to Night Hunter's silence wards, and Sonne Grab was occupied by Night Hunter.

Both of these explanations are true. A mysterious individual who sought the revival of Gyze brought together two divergent timelines, one where Gastille was a legendary demon lord and one where he was no more than a footnote of history, using the grudges both Gastilles held to bind them to the mortal realm.

During his younger days, Gastille was merely one of many demon lords jockeying for power in Dark Zone. He, like many others, was created by Messiah, who populated the world with good and evil beings alike. However, as Gastille gained in influence, he began to destabilize the power balance in Dark Zone and threatened to do so for the entire world, so Gyze was sent in to destroy him. Gyze annihilated Gastille's armies and beat Gastille himself to an inch of his life—but, on a whime, Gyze spared Gastille. Back then, Gyze had doubts over whether Gastille was truly pure evil, as that meant Messiah had created a being of pure evil, and wanted to see if a supposed being of evil could change. Thus Gyze threatened Gastille: "Follow me, or die."

Gastille was made to become Gyze's assistant, helping them with smiting evildoers throughout the world. Gastille could not comprehend why a god such as Gyze would use their great powers to help others rather than dominate others. As time went on, Gastille began to understand, but only somewhat. Gastille became Gyze's confidant, and the two became friends of sorts.

Centuries later, when Gyze seriously started to doubt the inherent goodness of the world, they confessed their concerns to both Hazur and Gastille. Hazur would take Gyze's concerns seriously, but tried to keep them on the right path. Gastille, however, would blindly agree to everything Gyze would say. While Gyze believed his friendship with Gastille to be a relationship between equals, Gastille did not see him as an equal, but as a god. Gastille's blind agreement would only reinforce Gyze's fears that the world was created to be evil, driving Gyze deeper into a depression that Hazur could not stop. Then, on a certain fateful day, Gyze's fears would cause them to seek answers, which would lead them to Earth and the demiurge, who would permanently warp Gyze's mind into insanity.

Gastille saw nothing wrong with Gyze, believing that Gyze was always right. Discarding everything the old Gyze had taught him, Gastille assembled the Apostles and their armies to fight against Messiah. They were eventually defeated, but Gastille survived, plotting to revive Gyze. He succeeded, but Gyze was once again defeated during the second Gyze war, causing his consciousness to become adrift in Relics. But now, he is back in Cray i, fused with his alternate self; what does the double demon lord's presence mean for the alternate Cray and for Gyze?