Seiya turn into dove (crying)
After a final battle with the Olympian Gods, Seiya who copied it from seeing Saga try to use it on Ikki uses Genromaken and takes control of the Gods and reveals he'll make them destroy all of humanity and has Hades use his power to revive the dead and create an Army
To stop him the Saints ally with the former enemies like the Specters, Marina, who all become super buddies after eating stew together one night, led by none other than Aiolos
Marin blows herself up to kill some fodder. Alberich shows up as well and reconciles with her and also blows himself with herself for no good reason after a speech about how they are the same
They finally reach Seiya, with Shaina, who took the leader role on the way, dying in the process and naming Hyoga the new captain
Seiya uses the power of Hades to summon every dead Gold Saint and Specter from every generation who's ever lived back to life to fight the Alliance, but they manage to somehow defeat every almost all of the Gold Saint and Specter without a scratch and seemingly kill Seiya after Hyoga convinces the remaining Specter Gold Saints to turn on Seiya by giving a 2 pages speech a 14 year old could come up with
Hades, being the key to Seiya being able to revive the dead and control them, lets Shun kill him by decapitating him
The fight continues with a mind controlled Zeus seemingly mass possessing most of the remaining Alliance members who aren't devil fruit users and turning them into zombies fighting for the. The remaining Alliance (Shun, Ikki, Sorrento, Isaak), have to fight them with tears in their eyes while a small team keeps going after Ikki
Saori amped by the cosmo of all the dead Gold Saint and Specters after
Armin Hyoga's pep talk deals the killing hit, blowing Seiya's head off his neck with a kick before catching it and necrokissing it
The next chapter starts with a flashback: Seiya uses Mnemosyne to visit Hyoga on his way to the battle and speak to him, erasing his memories of that chat with her power afterwards.
On their chat Seiya reveal that the Saints were created to begin with because of the OG human Athena, who'd been reincarnated child slave who had her tongue cut out and her village burned, fell in love with her master and wanted him happy which is what led to her love for humanity we see throughout the story, so she created the Saints
Seiya is in fact this master, who keeps reincarnating as the Pegasus Saint, and Saori spent the last centuries allowing this conflict to happen because Seiya loved fighting as a Saint
Hyoga still dosn't give the slightest damn, so Seiya goes on to apologize for getting those who died killed, and the fact more of them might die in the final battle, and reveals his true intentions:
He's going to be a super bad guy so everyone teams up to stop him and unite everyone Saints, Marina and Specters would ever happen again!
Also the Alliance is way too late, 80% of all world was destroyed
Hyoga still cound't care less about any of that. Instead he asks about Saori being heartbroken. To what Seiya replies she might be able to move on
That is the last straw: Hyoga finally loses his shit, punches him and starts screaming
To what Seiya breaks down crying about how he doesn't want Saori finding another man for 10 years at least
Seeing that Hyoga changes his mind completely and tries to convince Seiya to find a way to keep living, what Seiya refueses
Hyoga thanks him for becoming a mass murderer for their sake and the talk ends
Back in present time the fight is over; Everyone who was possessed by Zeus gets turned back to normal as Seiya's mind control wears off
Everyone remembers Seiya visiting them just like Hyoga, and start crying at the thought of what a man he was...
Cut a few years into the future, Saori is visiting Seiya's grave with Julian Solo and their child when out of nowhere, a literal Pegasus appears out of nowhere and wraps the piece of his red shirt around Saori. She somehow immediately deduces it must be Seiya and thanks him for it.
Cut a few more years, Saori is buried with that piece of the red shirt next to Seiya.
Cut a few more years: War between the gods restarted, and the Sanctuary was nuked by what's left of the Specters and Marina fearing another Saint like Seiya might appear again
Cut to the distant future: A boy exploring the ruins of Sanctuary finds a weird thingy remarkably similar to the box that contained the Pegasus Cloth