The Norse Lostbelt (北欧異聞帯, Hokuō Ibun-tai ?, alt. "Scandinavian Lostbelt"), alternatively Lostbelt No. 2 (ロストベルト No. 2?), is the second of the seven known Lostbelts. Originating in 1000 BC, it's Lost Depth is B+ and it's associated Crypter is Ophelia Phamrsolone.
The events of Chaldea's visit to this Lostbelt are covered in the second chapter of Cosmos in the Lostbelt; Götterdämmerung: Eternal Ice-Flame Century (無間氷焔世紀, Mugen Hyōen Seiki?, localized as "Eternal Icy Fire Century"), alternatively ■■■ of the Unfading Flame (消えぬ炎の■■■?, localized as "■■■ of Everlasting Flame").
SettingEditThe Lostbelt diverged from the Greater History of Man in 1000 BC, during the events of Ragnarok. Surtr, who was supposed to bring the Twilight of the Gods, devoured Fenrir, gaining his Authority and becoming immensely powerful. He decided to bring about the Twilight of the World, killing many gods and giants before being sealed within a false Sun by Odin, who died afterward. However, before dying Odin merged the goddess Skadi with Scáthach, creating Skadi-Scáthach, the King of the Lostbelt, with the purpose of protecting the humans. As Ragnarok was thus interrupted, the world became ravaged by fire and ice, unable to continue past Ragnarok.
Skadi-Scáthach established multiple villages for humans, with the support of the Valkyrie. However, in order to keep the giants at bay, humans are required to reproduce at the age of fifteen or be sacrificed to the giants. Once humans reach the age of twenty-five they are nonetheless forced to be sacrificed. The B+ rank Lost Depth is caued by Earth no longer having humans with the remainder forced to live in the Realm of Shadows. Also, the Realm is only capable of maintaining a few hundred humans before collapsing as such, humans who fail to reproduce at 15 or reach the age of 21 are sacrificed to both appease the giants and maintain the Realm.
The Shadow Border is chased by an unknown entity during Zero Sail. Chaldea emerges in the Lostbelt, and Ritsuka and Mash exit to investigate outside. They observe blue flames floating abowe the mountaintops, as well a particularly large sun. They do not see the Fantasy Tree however, even though they saw it during the Zero Sail. They're suddenly attacked by a giant they manage to slay. Sherlock Holmes explains the Shadow Border couldn't detect it because Chaldea lacks records on giants. The minute levels of magic in the ice and snow are also responisble. After her Ortenaus system is updated, Mash detects more enemies, so the pair break through to the Shadow Border.
Sherlock confirms what Ritsuka and Mash encountered was a Jotun. Suddenly a figure with a magical reaction rivalling that of Angrboda from the London Singularity approaches the Shadow Border. Chaldea tries to perform the Zero Sail, only for the Servant to grab the Shadow Border and throw it. Ritsuka, Mash, and Sherlock exit to confront them when they start cutting into the Shadow Border. During the fight, Sherlock deduces he is Sigurd. He tries to use Baritsu to stop him from activating Gram when Sigurd cuts his right arm off. Sigurd then enters the Shadow Border, so Sherlock orders the others to give chase, suspecting he's after something in the Shadow Border. They enter after being strengthen by Elementary, My Dear. Sherlock confesses to Leonardo da Vinci that Sigurd carved a Primordial Rune of Death when he severed his arm. Ritsuka and Mash chase Sigurd to the cockpit, only to find it empty. They then arrive outside to see Goldolf Musik handing the Paper Moon to Sigurd. They try to take it back, but they're easily overwhelmed. Sigurd then moves to execute them, but he stops and leaves. 
Later, Da Vinci reveals Servant summoning will be impossible due to damage to the Shadow Border, lack of leylines, and the magical ice and snow. Ritsuka and Mash then head out to find Sigurd along with the Paper Moon. They save Gelda from Jotun, and help her gather herbs in a Jotun inhabitated meadow. The group eventually reach her village, Village 23. They learn the villagers are sacrificed to the Jotun once they reach the age of 25 after the children are raised to the age of 10. Villagers between the age of 14 and 15 are suspected to make children, otherwise they'll be sacrificed. Later, Mash fights a Valkyrie when the latter tried to enact the Ritual of Ordainment, the sacrificing of adults. She fights the reinforcements when a Servant arrives to help. After the Valkyries retreat, he introduces himself as Napoleon Bonaparte. He joins Ritsuka and Mash, and reveals Scáthach Skadi is the Lostbelt King, a fusion of the proper history's Lancer (Fate/Grand Order - Scáthach) and the Lostbelt's Skadi. He also reveals the Valykries are mass-produced by her. Later, the group plan to infiltrate the castle where the Scáthach Skadi resides, with the goal of retrieving the Paper Moon and information about the Fantasy Tree.
The group enter the castle through an underground passage connecting to main tower. They reach the throne room, where they meet the Lostbelt King, Scáthach Skadi. She refuses to divulge the location of the Fantasy Tree, and orders the Valykrie Thrud to capture the group. They fight when Ophelia Phamrsolone and Sigurd enter. Napoleon reveals he met her during his first failed assault on the castle. Ophelia then orders Sigurd neutralize the group. They fight him when Ophelia ascends his Spirit Origin. She also uses her Mystic Eye to slow Mash by reversing Ortenaus' output. Before the fight can go any longer though, Scáthach Skadi orders Ophelia to stop. She then immobilizes them with her runes when Caenis appears. She is a Lostbelt Servant contracted with Kirschtaria Wodime ordered to investigate each Lostbelt. She tries to kill Ritsuka, but Napoleon stops her. She tries to attack him when Sigurd stops her in acccordance with Scáthach Skadi's decree that killing in the castle is prohibited. She then delievers a video message from Kirschtaria to Scáthach Skadi under the assumption Chaldea is also there. He reveals the roots of the Fantasy Tree of his Lostbelt, the Atlantic Lostbelt, the Fantasy Atlas cover 80% of the planet's surface. He claims even if the other Trees are destroyed, the proper history cannot be restore while Atlas remains. After the message ends, Caenis returns to the Atlantic Lostbelt.
Inside the dungeon, Ritsuka and Napoleon enter into a temporary contract. Ritsuka suddenly falls down into a dream-like state because a girl forcibly bonded with them while they were in process of contracting with Napoleon. She introduces herself as Sitonai when the dream ends. She appeared suddenly in the prison cell when Ritsuka collapsed. She reveals she is also a prisoner like the others. She also reveals she is a Pseudo-Servant whose body is Illyasviel von Einzbern, as well as a High-Servant. She explains Illya became a Servant of the Proper History of Humanity because of her connection to the Holy Grail, and the fact the Einzberns don't exist in the Lostbelts. She materialized the same time as Napoleon, but she was found and imprisoned by Scáthach Skadi. She suspects she wasn't executed because one of the Divine Spirits comprising her, alongside Sitonai and Louhi, is Freya. She then reveals Sigurd is a Servant from the Proper History. She then suggest the group confront him since he still has the Paper Moon. He would also know the Fantasy Tree's location since he's always at Ophelia's side. Sitonia reveals there is another goddess from the Proper History that can help the group oppose Sigurd. After giving their location, she opens the cell door, and conceals the group so they can escape.
The group escape the castle when they're confronted by Koyanskaya. They breakthrough her fire jotun, and continue their escape. They eventually reach Galdhøpiggen, the location of the goddess Sitonai mentioned. They find a ice castle at the peak surrounded by magical flames acting as a barrier. As they contemplate on how to bypass it, unknown lifeforms crash down and attack them. Napoleon shoots one with enough force that they crash into the castle, but it's thrown out and destroyed. The castle's occupant, Brynhildr, then introduces herself. After agreeing to help, she explains she was imprisoned by the Valkyries and Ophelia after materializing. They eventually come to Village 67 when Goldolf warns Village 23 is under attack. They reach the village by nightfall to find it safe, learning from Gelda someone claiming to be from Chaldea possibly saved it. The next morning, the Shadow Border comes under attack from Valkyries, so the group rush over there. After fending them off, they fight Thrud, Hildr, and Ortlinde, the bases for the mass-produced Valkyries. Brynhildr kills Thrud and Hildr, while Ortlinde retreats.
The group return to Scáthach Skadi's castle where they fight Sigurd and Ortlinde. Brynhildr realizes Sigurd is stronger than usual, so she activate a primodiral rune to empower herself as the risk of burning her soul away. However, Ophelia arrives and uses her Mystic Eye to undo its effects, but not the severe damage done to Brynhildr's Spiritual Core. Despite the risks though, Brynhildr reactivates the rune. Her determination to kill Sigurd also negated Ophelia's second attempt to use her Mystic Eye on her since it doesn't work on singular possiblities. She then uses Brynhildr Romantia to kill Sigurd, but it doesn't kill him. He reveals he isn't Sigurd, and attacks the group. Brynhildr destroys his Spiritual Core, but he still isn't dead. He reveals he was waitng for someone capable of piercing Sigurd's Spiritual Core, as the Command Spells forbid suicide. Ophelia tries to use her Mystic Code to undo his defeat, but it doesn't work. With the desctruction of Sigurd's Spirtual Core, the false sun meant to seal Surtr away begins to break. At the same time, the masks created by Scáthach Skadi to pacify the jotun are undone. It is then revealed Surtr possessed Sigurd through his connection to Ophelia's Mystic Eye when she performed the summoning. The false sun is also revealed to had been Surtr's true body sealed by Odin. When Surt revealed his intention to burn the planet once free with Sigurd's death, Ophelia used her Command Spells to forbid suicide. Mash and Napoleon try to fight Surtr when he kidnaps Ophelia. Ortlinde uses a rune maintain Sigurd's body, which was assisted by Ophelia using her Mystic Eye on him earlier. After Sigurd heals Brynhildr, Scáthach Skadi reveals the Jotun are attacking the villages, as her masks meant to pacify them no longer function with Surtr free. She then reveals Ragnarok changed when Surtr ate Fenrir to gain his Authority and proceeded to kill the gods and giants, intending to burn the planet. Odin defeated him with the remaining gods, and used a rune to seal him in a false god. He then fused the last god, Skadi, with Scáthach before passing. Scáthach Skadi then covered the world with magical snow, created masks for the Jotun to control them, and mass-produced the Valkyries. Suddenly, the unknow lifeforms that the group fought earlier then crash down. Scáthach Skadi reveals they're Fantasy Tree Seeds, and she's shocked when her command doesn't destroy them. Sitonai then arrives and reveals Scáthach Skadi's connection to the Tree has been severed. After the Seeds are destroyed, the group suspect Surtr is the new Lostbelt King. Scáthach Skadi then reveals the Tree is to north, and it's camoflagued by her magical snow. After she agrees to help, the group return to the Shadow Border in pursuit of Surtr.
Surtr absorbs the Fantasy Tree, regaining Fenrir's Authority. He tries to use Loptr Laegjarn to destroy Village 23, but Heracles, summoned by Sitonai, blocks it while supported by Ortlinde, Scáthach Skadi, Sigurd, and Byrnhildr. Napoleon then overcharges Arc de Triomphe de l'Étoile to damage Surtr at the cost of his life. It is revealed he was summoned in response to Ophelia's wish for someone to come and save her. Invigorated by his sacrifice, Ophelia then escapes from Surtr to join the others. She warns if Surtr burns the planet and the Norse Lostbelt becomes the new history, the planet's Texture will be fire. She also reveals Surtr will become weaken when she severs her contract with him. Then, as it is her connection to Surtr, she destroys her Mystic Eye to sever their contract, even though the mana overflow will destory her brain. She then uses her Sirius Light to rewrite the Lostbelt. Then, supported by Scáthach Skadi and Sitonai, the group ascend to fight Surtr. Sigurd uses Bölverk Gram to severly wound Surtr since Fafnir's curse exist inside him. This severs Surtr's connection to the Fantasy Tree, and causes the Paper Moon to fall from his grasp. After being defeated, Surtr carves a rune of death into Ritsuka. However, Ritsuka's death was a illusion created by Brynhildr's rune she casted on Surtr. She and Sigurd then finish him off at the cost of their lives. Afterwards, Ophelia dies as the cost of using the Sirius Light was her life. Scáthach Skadi and Ortlinde then fight Rituska and Mash to protect the weakened Fantasy Tree Sombrero. Afterwards, the pair destroy Sombrero.
|Ruler||Sherlock Holmes||Ritsuka Fujimaru|
|Archer||Napoleon Bonaparte||Ritsuka Fujimaru|
|Caster (Living Hero)||Scáthach Skadi||N/A|
|Lancer (Living Hero)||Valkyrie||Skadi|
|Jötunn/Saber (Living Hero)||Surtr||Ophelia Phamrsolone|
|Fantasy Tree||Fantasy Tree Sombrero||Alien God|
- ↑ 1.0 1.1 Fate/Grand Order: Cosmos in the Lostbelt PV
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Lostbelt No.3 Prologue
- ↑ 3.0 3.1 Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 1: Mythical Sword Assault (Prequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 2: Mythical Sword Assault (Sequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 3: Lord of All Creations (Human Race) (Prequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 4: Lord of All Creations (Human Race) (Sequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 5: Snow and Ice Castle (Prequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 6: Snow and Ice Castle (Sequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 7: Another Goddess (Prequel)
- ↑ 10.0 10.1 Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 8: Another Goddess (Sequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 9: As though it was Sunny in Spring (Prequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 10: As though it was Sunny in Spring (Middle)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 11: As though it was Sunny in Spring (Prequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 12: You are like a Sunny in Spring (Sequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 13: Our Melancholia Repeats Here Again (Prequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 14: Our Melancholia Repeats Here Again (Middlel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 15: Our Melancholia Repeats Here Again (Sequel)
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 16: In Front of Our Eyes
- ↑ Fate/Grand Order: Cosmos in the Lostbelt - Götterdämmerung: Eternal Ice-Flame Century, Section 17: ───Subjugate, Crossing Through The Melancholia