Arc 3The Second Great Collapse
Moros and Elysia joined forces to defeat the Herrscher of Void, but the rulers of the human world broke their agreement to give Moros Australia. Moros retaliated against the combined army, and negotiations over his demands ended in deadlock.
- Moros revealed his Demiplane and his identity as a transmigrator to Elysia and Eden, then toured Graveyard City and its Mage Guild with them.
- Moros took Elysia and Eden on a journey across varied landscapes and through a Crypt, where they defeated undead guards and shared the treasure before returning to Osaka City.
- Moros perfected Vampire Transformation Daggers, sold them to wealthy elites, and killed the Moth to Fire leader who tried to stop the auction.
- Herbert exposed the new vampires to the public, while Mobius studied their nature and Moros claimed African mines by killing the workers and raising them as undead.
- Subject 173 became the Herrscher of Void and led a Honkai Beast Legion against Mu Continent, killing Benares and devastating cities despite the military's attacks.
- Moros agreed to fight the Herrscher of Void in exchange for Australia, then joined Elysia to exhaust the Herrscher's Collapse Energy and defeat her forces.
- After the rulers broke their pact, Moros attacked the combined army and destroyed a city with Armageddon, prompting them to send a delegation to negotiate.
- Moros demanded compensation and the annexation of Australia and New Zealand, but Richard and Gerard objected and the first day of negotiations ended without an agreement.