Kuon/Story

Eos
He was adopted by Excellion Lucis Caelum, becoming Remus Scarlet's and Karen's brother. Hyde participated in the last Lucian-Wyverian war as a glaive until the last battle.

Before Excellion Lucis Caelum destroyed the capitals of both countries, he took a train and left for Adagium. After Excellion took over Eos, he roamed the world trying to locate his old teammates Omega, Astora, Armstrong, Hazama, and Chloe. He only managed to locate the first three. After that, the four of them (and Omega's soldiers), pursued Excellion to the throne room in the orbital station, after which he gladly abdicated.

Immediately following Excellion's disappearance, the Black Legion invaded Eos for the second time and Hyde jumped straight into their forces and managed to get all the way over to their leader. In the confrontation with Chaos and the Black Legion, Hyde's body was disintegrated by the darkness, though it seems he awakened his latent power just in time to survive for a while more, wound Chaos, and make a new body. He was then forced to retreat to the Black Legion's home planet after his previous body was destroyed by Chaos in the second invasion.

A year later (and after encountering the watchers), he came back to Eos just in time to drive Chaos away, following that, his father met with him at his own grave and had some words with him; this drove him to put an end to an encounter between Talon, Omega, Astora, and the vampire siblings Moving on, he visited the body of his brother and left for the land of eternity in order to meet up with Tsukihi and make a path for the main group. He appeared a few more times during the Black Legion events, making a major appearance at the Dark Star Core before the party confronted Chaos.

Before departing to Caelum and visiting Excellion, he gave the members of the Nine and the Black Legion's party "red glass-like fragments" that can open pathways between universes, he also promised to convince The Administrator to let them travel around for now

Caelum
He dived into Caelum's abyss, meeting several people along the way, solving some problems, and reaching the bottom to meet CT. He then exited the abyss, met Ishtar along the way to Jhin's HQ, and then had some family talk with Jhin and oddity Tael. Later he basically forced Ishtar to drag him back to the abyss so he could talk to CT; and then spent 3 days waiting for Ishtar to come back after she teleported away, after which they had a rather heated conversation. He and Ishtar left the abyss and talked with Aevum in the Outlands, who further informed them of the locks and of his own, although he did not give an answer for the question of how to break them. Kuon returned to Boundless HQ and discussed the matter of the lock with od. Tael, Omega, and Jhin. He left for the Metropolis with Ishtar and Jhin, in search of Tatl.

While at the Metropolis, the three of them had run ins with several of the wings and ended up helping Moses with her research on distortions. Kuon later helped a young messenger overcome his existentialism and joined forces with the Vermilion Ace to destroy the Index after it had kidnapped Moses and Ishtar. The Ace then conscripted him and Jhin into Hana Association and sent them off on a mission to investigate the Sump where they suspected Tatl was located. The three of them headed to the Sump at the same time as Lucisfear was summoned and found Ciel fighting off the Hell-Sent Bullet during the Night of Fallen Angels. The four of them managed to execute the commander and stop Lucisfear's noble phantasm, after which Ciel tried to attack Kuon as she declared that she was not going to associate with monsters.

The four eventually reached the Grand Archives, where they helped restore a girl's self-worth, shattered the delusions of a man obsessed with security, set a drug addict on the right path and participated in an author's play for his heart. Kuon talked to Tatl at the top of the archives, sharing his conviction and Tael's story and convincing her to fight on his side. Tatl left for the abyss and the other three were pulled into a grand fight after Lucisfear distorted Ciel into the Echo of the City. With the aid of Tael, Jhin and Eve, he managed to weaken Lucisfear's corrupted distortion enough for the Vermilion Ace to make one last intervention, giving Ciel a window to reject the distortion.

After the Echo went berserk, Lucisfear intervened and forced Kuon to clash with him. With half of Kuon's lock still in place, Lucisfear managed to completely destabilize Kuon's sense of self and deal massive damage with a simple block. Thus, he was not present for the second part of the fight against the Echo, but he did come back for the post-fight talk.

He then marched to the Outland districts to witness the reconciliation between Aevum and Licht before leaving to have a grand battle against Pantheon at the top of the Erdtree.

Kuon landed at the bottom of the abyss and triumphantly declared:The battle against CT was an even one, with neither of them truly emerging victorious, as planned. Kuon then split his own heart in half, comitting suicide right then and there and severing the event of his death.Kuon met the mind of Genesis upon death, and instead of simply rejoining the collective unconscious, Kuon made use of the fact that only half of him is part of Genesis to attack God itself, breaking the other half of his lock and completely separating himself from Genesis. He "metaphorically" reclaimed his blade from his future tomb made by Chaos and cut through Genesis.

He relied on his bonds with the people he's helped on his journey to bring him back. And so, after a long and arduous grand assault on the raid boss that is CT with around 20-30 characters participating (in theory), the impossibility of the event of Kuon's death took effect.

Upon returning from the dead, having retaken his life, Kuon utilized God Shattering Star and Every Moment Matters on CT, severing his soul and finishing him off for good.