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Demeter, the Goddess of Earth. Do you regret disappearing in a place like this?
~ The Priestess to the dying Demeter; the first verbal word she had ever shown spoken on-screen

The Priestess of the Alien Star, also known as the Priestess of the Alien God, is a major antagonist in Fate/Grand Order: Cosmos of the Lostbelt. She is a mysterious and unnamed priestess that serves as the right-hand to the Alien God, with everything around her being a complete mystery. She is also the overseer of Crypters' and Koyanskaya's actions.


Thus far, the Priestess' information and ultimate goal remain in mystery, and she is yet to speak a single word. However, both Koyanskaya and Kirschtaria Wodime are shown to communicate with her, although she never shown to speak a noticiable verbal work, until she began to communicate with the dying Gods of Olympus in the void, where she was finally seen speaking. Before Chaldea's destruction, she was also shown to have overwatching Ritsuka Fujimura and Mash.

Although at the Alien God's side, the Priestess also somehow helped the Chaldea crew to destroy the Fantasy Tree from Russian Lostbelt. She also appears in several random occations with a habit of just watching and leaving soon after, like during the meeting to the Crypters, or the imprisonment of Koyanskaya by Emperor Qin Shi Huang.

However, after the Chaldea crew's confrontation against Kirschtaria became an epic fail, the Priestess appeared not far away from them, with Holmes noticing her and discovered she had great comtempt for the crew.

In addition, the Priestess' existence or prescence would never be detected through any mechanical means, and could only be discovered through seeing her. Everything that is surrounding her is also as otherworldly as much as possible, and even her own seemed to lack an understanding on her nature or her identity. Above all, the Priestess is apparent aware of the Crypters' treachery against the Lostbelt Kings and even her master, the Alien God itself, but she neither report nor take further actions to prevent it.


  • There is a yet-to-be comfirmed theory in fanbase that the Priestess is actually an incarnation of the late Olga Marie Animusphere herself. The possible evidence would be a certain part in Moonlight | Lostroom OVA, where Olga Marie was shown to have lost her life and reaching out to somewhere in front of her. When the scene was over, it immediately shown that the Priestess was reaching out for somewhere in the same manner.



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Assassin | Beast of Revelation | Caster

Masters & Humans

Manaka Sajyou | Sancraid Phahn | Misaya Reiroukan

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Masters & Humans

Kirei Kotomine | Kiritsugu Emiya | Ryuunosuke Uryuu | Byakuya Matou | Kayneth El-Melloi Archibald | Sola-Ui Nuada-Re Sophia-Ri


True Assassin | Assassin | Caster | Saber Alter

Black Shadow

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Masters & Humans

Zouken Matou | Dark Sakura | Kirei Kotomine | Shinji Matou | Souichirou Kuzuki | Illyasviel von Einzbern


Gilgamesh | Archer (Unlimited Blade Works) | Assassin | Caster

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Dr. Heartless | Faker | Gilgamesh | Kayneth El-Melloi Archibald | Sola-Ui Nuada-Re Sophia-Ri | Ernest Fargo | Gurdoa Davenant | Trevor Pelham Codrington | Marisbury Animusphere

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False Masters
Jester Karture

False Servants
False Archer | False Berserker

True Masters
Faldeus Dioland | Francesca | Bazdilot Cordelion | Sigma

True Servants
True Caster | Watcher

Filia | Master of Archer | Cashura | Kuruokas | Wolf's Creator

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Twice H. Pieceman | Leonardo Bistario Harwey

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Kiara Sessyoin | BB | Kazurodrop | Kirei Kotomine | Shinji Matou

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Souren Araya | Kirie Fujou | Fujino Asagami | Cornelius Alba | Misaya Ouji | Satsuki Kurogiri | Lio Shirazumi | Meruka Kuramitsu

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Yggdmillenia Clan & Black Faction

Darnic Prestone Yggdmillenia | Celenike Icecolle Yggdmillennia | Assassin of Black | Caster of Black | Lancer of Black

Red Faction

Shirou Kotomine | Archer of Red | Assassin of Red

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Beasts of Calamity

Goetia | Tiamat | Kiara Sessyoin | Mara | Primate Murder | Koyanskaya | Beast of Revelation | VII of the End

Part 1: Observer on Timeless Temple

Heroic Spirits

Jeanne Alter | Jason | Goddess Rhongomyniad | Mephistopheles | Gorgon | Kingu

Allies of the Beasts

King Solomon | Lev Lainur Flauros | Demon Pillars | Laḫmu


Zolgen Makiri | Marisbury Animusphere

Part 1.5: Epic on the Remnants

Demon Pillars


Phantom Demon Alliance (Archer of Shinjuku | Avenger of Shinjuku | Archer Alter | Assassin of Shinjuku)


Rider of Resistance | Caster of the Nightless City


Kiara Sessyoin


Caster Limbo



Part 2: Cosmos of the Lostbelt

Kadoc Zemlupus | Ophelia Phamrsolone | Hinako Akuta | Scandinavia Peperoncino | Kirschtaria Wodime | Beryl Gut | Daybit Sem Void

Lostbelt Kings
Ivan the Terrible | Skadi | Qin Shi Huang | Arjuna Alter | Zeus

Alien God's Force
Alien God | Priestess of the Alien Star | Koyanskaya | Emissaries (Kirei Kotomine | Caster Limbo | Senji Muramasa)

Crypters' Servants
Anastasia Romanova | Sigurd | Prince of Lanling | Xiang Yu | Ashwatthama | Dioscuri Twins | Caenis | Grand Berserker

Lostbelt Inhabitants
Oprichniki | Surtr | Qin Liangyu | Odysseus | Lostbelt Olympians

Archer of Red | Caster of Black | Kama | Goetia

Event Villains

BB | Black Grail | First Lady | Testement | Ultra Heroine Z | Zouken Matou | The Master With No Name | Darnic Prestone Yggdmillenia | Kama | Space Ishtar | Xu Fu

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