While Observer on Timeless Temple, Epic of Remnant and Cosmos in the Lostbelt (plus its continuation in Ordeal Call) has Solomon/Goetia, four escaped Demon God Pillars and the Foreign God/the Foreign World CHALDEAS using U-Olga Marie as its vessel respectively, due to Fate/Grand Order having multiple chapters, it has several Arc Villains serving as The Heavy.
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Observer on Timeless Temple
- The Flame Contaminated City, Fuyuki: Altria Pendragon (Alter) is the one guarding the Holy Grail sustaining the Singularity, though she isn't the cause of it.
- Hundred Years War of the Evil Dragons, Orleans: Jeanne d'Arc (Alter) serves as the main antagonist, summoning Berserk Servants and Dragons to attack France. Caster Gilles de Rais serves as the Greater-Scope Villain, being the one who created Jeanne Alter.
- Eternal Madness Empire, Septem: The United Roman Empire, lead by Romulus and Lev Lainur Flauros, with the latter serving as the Dragon-in-Chief.
- Sealed Ends of the Four Seas, Okeanos: Edward Teach is the one that has the Grail sustaining the singularity, though he has this role taken from him by Jason, with the latter being manipulated by Medea (Lily).
- The Mist City, London: Makriri Zolgennote is the one leading Project Demon Fog, and ends up as the host of the Demon God Barbatos.
- North American Myth War, E Pluribus Unum: Queen Medb is the one leading the Celtic army, and the one who used the Holy Grail to create her "Perfect King", Cú Chulainn (Alter).
- Divine Realm of the Round Table, Camelot: Goddess Rhongomyniad, a.k.a Altria Pendragon, intends to convert all of mankind into energy that shall live forever within Rhongomyniad under her rule, and is the one who caused the distortion that changed the singularity from Jerusalem to Camelot.
- Absolute Demonic Front, Babylonia: The Three Goddess Alliance consisting of Ereshkigal, Quetzalcoatl and Gorgon, the latter serving as The Heavy, are the Big Bad Duumvirate trying to exterminate humanity in the singularity. Though they're being manipulated by Kingu, who's working for his mother; Tiamat, the second beast.
- The Grand Temple of Time, Solomon: The Final Singularity has the titular Solomon, who's revealed to actually be Goetia.
Arcade
- Knight Order's Esteemed Expedition, Lost Jerusalem: An alternate version of Jacques de Molay who survived the crusades.
- Prosperous Threshold City, Babylon: Nebuchadnezzar II, who's working for his wife, Queen Draco, the Big Bad for Arcade's first arc.
Epic of Remnant
- Quarantined Territory of Malice, Shinjuku: The Demon God for this singularity is Bael, who's working with Archer of Shinjuku/James Moriarty to get revenge for Goetia's defeat at the hands of Chaldea.
- Abyssal Cyber Paradise, SE.RA.PH: Kiara Sessyoin, who intends to become Beast III, and merge with the Earth's core to induce an eternal orgasmic trance on all living beings, for the sake of her own pleasure. In addition, Zepar, The event's Demon God, was so horrified of her he begged to be free of her.
- Subterranean World of Folklore, Agartha: Caster of the Nightless City/Scheherazade and the Demon God Phenex created the story of the Agartha Pseudo-Singularitynote in order to expose Magecraft to the world.
- The Stage of Carnage, Shimousa: The Sorcerer, an Alternate Version of Amakusa Shiro Tokisada, is the main villain of the Pseudo-Singularity, attempting to wipe out the Tokugawa Shogunate in revenge for the prosecution of Japanese Christians. He is also revealed to be the Unwitting Pawn of Caster of Limbo/Ashiya Douman.
- Forbidden Advent Garden, Salem: Demon God Raum is the villain of this chapter, attempting to summon the Outer God Sut-Typhonnote into the body of Abigail Willaims, in order to bring about Hell on Earth.
Cosmos in the Lostbelt
- Permafrost Empire, Anastasia: Ivan the Terrible is the King of the Lostbelt, with Kadoc and Anastasia, who served as the main antagonists for the Lostbelt Prologue, working against him.
- The Eternal Icy Fire Century, Götterdämmerung: Scáthach-Skadi and Ophelia are the Lostbelt's King and its Crypter respectively, who are making the Lostbelt's citizens sacrifice themselves to the Jotun in order to ensure that can survive the harsh conditions of the lostbelt. The actual villain is Surtr, the one who caused the events of the Lostbelt to begin with, and masquerades as Sigurd to free his body so he can attempt to destroy the world, in order to prove his love for Ophelia.
- The Synchronized Intellect Nation, S I N: The Lostbelt King Qin Shi Huang attempts to ensure peace by whipping out anything Confucian in the Lostbelt. He eventually has a Heel–Face Turn and helps Chaldea against Hinako Akuta/Yu Mei-Ren when the latter betrays him as the Final Boss.
- Tokugawa Restoration Labyrinth, Ooku: An Alternate Version of Kama/Mara, who seeks to manifest as Beast III/L in order to cause societal decay.
- Saṃsāra of Genesis and Terminus, Yugakshetra: The Lostbelt King, God Arjuna hijacked the Yuga Cycle and shortened it to Ten Days, in order to wipe out all evil in the world, with the Crypter Pepronchino allying with Chaldea to defeat him. Ashiya Douman serves as the Greater-Scope Villain, having manipulated Arjuna into shortening the cycle.
- Void Space Naval Battle・Imaginary Scramble: The Evil God of Flowers, who is implied to be Vulthoom, created Van Gogh and dragged the protagonists into the Imaginary Number Space to make an alliance with the Outer God of the Abyss, the latter implied to be Cthulhu, and use its chosen vessel Katsushika Hokusai to set the stage for an Outer God invasion of Earth. After it's beaten and Van Gogh comes to her senses, Yang Guifei makes her move to steal Gogh's Holy Grail and brainwashes many of Chaldea's Foreigners in order to let her own "Emperor", who is implied to be Cthugha, proceed with its own plan to escape its prison and take Earth for itself.
- Lostbelt 5
- Ancient Ocean of the Dreadnought Gods, Atlantis: Odysseus, Artemis and Poseidon serve as the Co-Dragons to Kirschtaria Wodime and Zeus, with Poseidon serving as the Final Boss.
- Interstellar Mountainous City, Olympus: Kirschtaria Wodime and Zeus take center stage as the main villains of the lostbelt, with Chaos serving as The Man Behind the Man for the latter. In addition, The Foreign God reveals themself during this chapter, confirming them to be Beast VII, and more mysteriously, a resurrected Olga Marie Animusphere.
- Hell Realm Mandala, Heian-kyō: Ashiya Douman finally takes center stage as the Arc Villain, attempting to become a Beast so he can triumph over his rival, Abe no Seimei.
- Fairy Realm of the Round Table, Avalon le Fae: Morgan serves as the main antagonist for the first two parts, and when it looks like Aurora and Spriggan will take her spot for Part 3 after they successfully engineer a scenario where she gets killed, they're quickly kicked aside by the threat of mass Mors outbreaks, civil war, and multiple Calamities running amok with special notice going to Cernunnos' awakening. Once he goes down, Oberon reveals his true identity as the Pretender Class Servant Oberon Vortigern and serves as the Final Boss.
- Non-Primate Ecosphere, Tunguska Sanctuary: Tamano Vitch Koyanskaya takes this role, in her attempt to become a Beast.
- Parting Memories Manifestation Realms, Traum: Kriemhild and Constantine XI act as faction leaders for a Mêlée à Trois conflict that Chaldea end up having to stop in order to end this singularity with Subject E being the main cause of this singularity as an act of revenge against Proper Human History. Meanwhile, a younger version of James Moriarty is there with his own separate agenda as he's been ordered to take over Chaldea, and either force Holmes to resume his original mission as a Disciple of the Foreign God or kill him as a traitor.
- Golden Sea of Trees Travelogue, Nahui Mictlān: Daybit Sem Void seeks to awaken ORT/Type Oort-Cloud so that it can devour CHALDEAS (the Foreign God who turned Olga Marie into its vessel) just to prevent its (and therefore Marisbury's) plans for humanity from happening. His Grand Servant, Tezcatlipoca, takes over his intended role in running the Lostbelt.
Ordeal Call
- Inner World of the Void Compass, Paper Moon: Rani XII and her Archer Durga, who wish to multiply Servants by dividing them and creating more Alter Egos. Durga eventually becomes her other self, Kali, and stops listening to Rani, becoming the Final Boss.
- Irreversible Trash Heap, Id: Le Comte de Monte Cristo, another form of Edmond Dantès, who puts the protagonist through the emotional wringer to show them the driving force of the Avengers and how it conflicts with the protagonist's ideals. While Alessandro di Cagliostro tries to be this, he gets outplayed tremendously by Dantès and is more of a Post-Final Boss than anything.
- Abnormal Gravitational Field - The Olga Marie Quests: The Count, Alessandro di Cagliostro, who turns U-Olga Marie's shattered Saint Graph into multiple elemental U-Olga variants that he refers to as E-Olga Marie. Each one serves as The Heavy, Arc Villain and Final Boss of a Presidential Singularity. Cagliostro, however, states that the Olga incarnations are the true stars of the show rather than himself and explains all he did was activate them. E-Aqua Marie (the second incarnation encountered) confirms that Cagliostro has no control over any of them, meaning they are all acting independently of their own free will, essentially claiming the role for themselves, which admittedly didn't seem to bother Cagliostro at all.
