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Genshin Impact

Cassiodor Story and Profile

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Genshin Impact Cassiodor Story and Profile.png

Cassiodor in Genshin Impact is the Harmost of Remus Sebastos, who's known to the Traveler as Monsieur Os. Check out Cassiodor's story and lore, along with his in-game quest appearances here in this lore guide!

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Cassiodor Character Information

Cassiodor Character Profile

Cassiodor
Genshin - Cassiodor Nation: Fontaine
Element: N/A
Faction: Remuria

Cassiodor Story and Lore

Harmost of Remus Sebastos

Genshin Impact Cassiodor Story and Profile - Harmost of Remus Sebastos.png

Cassiodor was originally a Harmost of Remus Sebastos, a person capable of rewriting the musical score of the Phobos. He holds the same position as Boethius, the traitor to the people of Remuria who seized control of Chaotic Symphony.

Cassiodor is also the Harmost the Traveler was seen conversing with, each time he dreams as the Imperator himself.

Turned Into Monsieur Os

Genshin Impact Cassiodor Story and Profile - Turned Into Monsieur Os.png

Because of the Chaotic Symphony, Cassiodor's soul inhabited a cat who first referred to himself as Ouranides of Ouranopolis, or Osse. Only when Osse spoke to Boethius during the Underwater Nocturne, has he gained his moniker, Cassiodor, once more.

Sacrificed Himself to Destroy Phobos

Genshin Impact Cassiodor Story and Profile - Sacrificed Himself to Destroy Phobos.png

In the Domus Aureus, Cassiodor assimilated with the Phobos, thereby filling it with his desire to end its reign. And with the help of Traveler to deal the finishing blow, the Phobos, along the remnants of Remuria, were freed, and granted entrance to the Great Sea.

Cassiodor In-Game Mentions & Appearances

Canticles of Harmony Quest Line

Quest Name Type
Shadow Over Petrichor World Quest
Underwater Nocturne World Quest
The Last Day of Remuria World Quest
Gradus ad Capitolium World Quest
Fortune Plango Vulnera World Quest

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