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Enormous hordes of Undead Gods flew across the Astral Road, flashing through the cosmos made up by the Supreme God of Star Ocean as the massive army reached the gigantic Realm of Death, Helheim, led by Hel and which was also the biggest outpost and fortress-like territory that the invaders of the Netherworld Plane used.
Powerful skeletons wearing black armor greeted the enormous armies made up of thousands of Undead Gods, raised from the dead by the Death Era's effect, they had been wandering across the world, devouring the living while wondering what their greater purpose was, until they realized that it was within this glorious Realm of the Death which emanated such a strong deathly and phantasmal aura, the embrace of the Supreme Domain of Hel made them feel right at home.
"Welcome to our lands of the dead, you've been wise to choose to join us, Undead Gods! You've been reborn by the grace of Hel, so you better make up for it with your strength…"
Check "The Protagonist's Sister Is Actually the Strongest"!