Russian Lostbelt

The Russian Lostbelt (ロシア異聞帯, Roshia Ibun-tai^?), alternatively Lostbelt No. 1 (ロストベルト No. 1^?), is the first of the seven known Lostbelts. Originating in Russia, 1570 A.D., it's Lost Depth is D and it's associated Crypter is Kadoc Zemlupus.

The events of Chaldea's visit to this Lostbelt are covered in the first chapter of Cosmos in the Lostbelt; Anastasia: Permafrost Empire (永久凍土帝国^?), alternatively Princess of the Land of Beasts (獣国の皇女, Jūkoku no Kōjo^?, localized as "The Grand Duchess of the Beast Nation").

Setting

The Lostbelt diverged from the Greater History of Man in 1570 AD when an asteroid struck and plunged the world into an ice age. Most humans died, and while Russians were used to the cold and prepared for such weather, 90% of their population perished and they were on the cusp of extinction. Ivan the Terrible and his mages were able to save the country by combining humans with magical beasts, creating the Yaga, with Ivan himself becoming the first. The D Rank Lost Depth resulted from the Eternal Winter that rendered humanity all but extinct (still alive but as Yaga).

Three months prior to Chaldea's arrival, Atalanta Alter, Billy the Kid, and Beowulf were summoned into the Lostbelt by the remnants of the Counter Force. Miyamoto Musashi also wandered into the Lostbelt from another world. Atalanta Alter became the leader of a rebellion against Ivan. The rebellion started as a result of Yaga Moscow's refusal to provide food to the weaker villages, and their claiming of any hunted Demonic Beast. Billy and Beowulf wandered around without any knowledge of their situation. They eventually became the protectors of a villager, and the leaders of a band of male Yaga. However, a number of them rejected human leadership, and turned to banditry. Musashi wandered Russia killing bandits and the Oprichnik while claiming to be from Chaldea, becoming something of a rumor.

The Fantasy Tree Orochi also manifested in Yaga Moscow three months ago. However, Ivan used his power as the Lostbelt King, Emergency Prerogative, to prevent Orochi from taking root. He then went asleep, activating Chulnei Oprichnik to calling forth the Oprochnik from his dreams. Kadoc Zemlupus thus conducted a plan to overthrow Ivan and replace him with his Servant, Anastasia Nikolaevna Romanova. Wolfgang Amadeus Mozart was brought to the royal palace to keep Ivan asleep by continously playing Requiem for Death. After playing endlessly for two months, he had Antonio Salieri take over for him. Anastasia pretended to be Ivan's first wife, Anastasia Romanovna Zakharyina-Yurieva^WP, to keep him relatively complacent. Grigori Rasputin also pretended to be his mentor, Metropolitan Macarius^WP, all the while keeping his true identity a secret from Anastasia.

History

Using their connection to the Oprichnik, Chaldea emerge out of Imaginary Number Space into Russia. However, the Shadow Border's armor was damaged in the process, rendering any future Zero Sails impossible. Leonardo da Vinci reveals all of Russia is surrounded a massive storm wall. It blocks all electromagnetic waves, and is extremely destructive. Ritsuka Fujimaru volunteers to investigate outside, and find an replacement for the Shadow Border's missing armor plate. Goldolf Musik forbids Sherlock Holmes from escorting them, instead ordering Jingle Abel Meuniere to go. Mash however offers to go instead given her past experiences. Da Vinci then gives her and Ritsuka Mystic Codes designed for polar regions. Mueuniere also gives Ritsuka a device that allows them to summon Servants once they establish a leyline and a suitable power source.

Ritsuka and Mash exit the Shadow Border in search for a leyline. They see an enormous tree in the distance when they're attacked by Demonic Beasts. They struggle until they're saved by an alleged werewolf. They follow him back to a village, but they find the Oprichnik there. At his house, the alleged werewolf introduces himself as Patxi. He assumes the pair are with the rebels since the Oprichnik are after them. He reveals it is 2019 when Sherlock asks, and the Oprichnik are Ivan the Terrible's personal guard. Ivan has lived for 500 years, and he is the oldest of Patxi's kind, the Yaga. Patxi explains a new Ice Age was triggered when a meteor struck the planet 450 years ago. Most of humanity perished, and while the Russians were prepared for the cold weather, they lost 90% of their population. To prevent extinction, Ivan and a mage created the Yaga by fusing Russia's remaining population with Demonic Beasts via Magecraft. Whilr Patxi goes hunting, Sherlock deduces the Oprichnik are Ivan's familiars. Da Vinci reports she detected a possible leyline while Ritsuka and Mash were escaping with Patxi. Given its distant location, Mash decides they should convince Patxi to take them. Upon his return, Sherlock asks him about the tree. Patxi only knows it appeared three months ago. Sherlock then sends him out to gather materials for a kite. Da Vinci deduces he wants to conduct the same experiment as Benjamin Franklin^WP to power the Spirit Origin briefcase. Paxti returns with the materials before leaving for another hunt. After building the kite, Ritsuka and Mash leave to use it.

The pair see Koyanskaya convince the Yaga into killing the weak so they can purchase her expensive meat. Da Vinci and Sherlock both realize she and Kirei Kotomine are Servants. However, Sherlock reveals Kirei isn't on the current Church clergy. According to Church records, Kirei's body was completely incinerated when he died in Japan in 2004, at least in their world. Suddenly, Ritsuka and Mash are found by Koyanskaya. She decides against killing them though since it wouldn't be interesting for her. After she leaves, the pair find the Yaga selling Patxi out to the Oprichnik. He shoots the Oprochnik trying to detain him. He isn't immediately executed though, as Koyanskaya's approval is needed. Ritsuka and Mash rescue him before he's mutilated.

After escaping, Patxi agrees to escort Ritsuka and Mash to the leyline. He reveals the rebels opposing Ivan for 450 years is now led by a female Archer. Eventually the group reach their destination, and Mash readies the kite and the briefcase for the coming storm. Sherlock explains Ritsuka will need immediately form a contract with the summoned Heroic Spirit since they won't last long with a Spirit Origin formed from magical energy converted from lightning. With the briefcase charged, Ritsuka uses it to summon Avicebron inside a cave. After killing a pack of Demonic Beasts, he starts converting the cave into his workshop. Sherlock deduces he was summoned because of the World's final plea, instead of a previous bond with Ritsuka. He realizes existing Heroic Spirits cannot easily materialize in this world. He agrees to repair the Shadow Border's armor if provided with magical ore to create new plating. Sherlock then tells the group to rendezvous with the rebels. Patxi admits he knows of a few villages rumored to have rebel ties.

Leaving the cave, the group pass through a village, but a guard demands a toll for using it as a shortcut. Avicebron persuades him to let them pass by offering a golem for labor purposes. After passing through, Patxi declares his intent to join the rebels, and enters the rebel village alone per Avicebron's suggestion. While waiting though, the others are attacked by rebels based on rumors Ivan is working with a human Master and Servant. The fight is eventually stopped by the intervention of the rebel leader. She rejects the others' request to join though since they're human. She explains only mages and Servants look human, and asks if they're with Ivan. She then has them test their strength to prove they're not Ivan's allies. After fulfilling her request, the rebel leader is convinced the group isn't with Ivan. She then introduces herself as Atalanta Alter. She recalls materializing three months ago, alleging the the Counter Force's remnants summoned her. She then takes the group to the rebel stronghold.

On the way to the stronghold, Atalanta Alter considers giving Avicebron any materials he requests if the group works hard. After passing through a tunnel, the group reach the stronghold. Later that night, Atalanta Alter makes the group the rebels' reserve corp. She then has them take on missions that require a small elite team to test their utility. Da Vinci then asks her about the giant tree, but Atalanta Alter doesn't know what is. However, her spy in Yaga Moscow reported it is called Fantasy Tree. After Ritsuka agrees to take on her missions, Atalanta Alter orders Patxi to escort them.Their first mission is to pass out the rebel's manifesto at nearby villages. She then gives the group some Demonic Beasts fangs and golem cores in advance. She agrees to give the rest if they help capture cities allied with Ivan. The next day, the group leave for their mission.

The group arrive at the first village on their list. They are granted entry after Patxi gives to the manifesto to a guard. He asks the village chief to lend some supplies, but the chief refuses to aid the rebel out of gratitude to Ivan. However, he recognizes the Oprichnik has become increasingly violent. He then has the group test their strength to prove they can defeat them. After they prove themselves, the chief offers the villag's full support. He also gives a letter of recommendation to help the group with the neighboring villages. However he fears they may have been lost due to the lack of contact from them.

The group find the second village destroyed. A survivor reveals bandits were responsible, and warns they're at the next village. The group rush to save it, only to find it already safe. The village chief recognizes them as Chaldeans. He reveals a human from Chaldea killed the bandits, and treated the wounded before heading to the mountains. The chief then gives his support to the rebels as thanks. Avicebron then has Paxti return to the rebels alone, while the rest proceed elsewhere.

Returing to the Shadow Border, Mash is given an immediate medical examination by Da Vinci. Meanwhile, Sherlock tells Ritsuka and Goldolf that Russia isn't a hypothetical history like a Singularity, but a history onto itself. He suspects the human mage with Ivan may be one of the Crypters, possibly Kadoc Zemlupus based on Koyanskaya's word. The next morning, Avicebron's golem repair the Shadow Border's armor. Ritsuka and Avicebron then leave for the rebel stronghold.

Arriving at the stronghold, Ritsuka and Mash learn Atalanta Alter need their help with the other Servants. She tells them there is a faction led by a Servant. She decides she must meet him herself, and asks Avicebron to look after the stronghold while she's gone. Ritsuka, Atalanta Alter, and Patxi then leave to meet with the faction leader.

On their way, the group chance upon some dead Yaga with signs incidating they were killed by a blade wielding human. After resting in a cave for the night, the group continue amidst a fiercer blizzard when they're found by Billy the Kid. After they fight him, Sherlock suspects there is a Holy Grail somewhere summoning Servants in response to the World's pleas. Beowulf then arrives in response to Billy's call for him. He immediately suspects Ritsuka of being the human mage with Ivan, so he and Billy fight the group to test their strength. After proving themselves, the group are accepted by the duo and their men.

Inside his cabin, Beowulf explains he and Billy were summoned three months ago with no knowledge of the situation. They wandered around before becoming the village's protectors. Atlanta Alter then proposes they join forces against Ivan. Beowulf and Billy have no issue, but their men won't accept it out of male chauvinism. Denying he was responsible for the dead Yaga found earlier, Beowulf and Billy recall rumors of a human killing Oprichnik and Yaga alike. They also saved one of the duo's men, claiming to be from Chaldea. Beowulf then admits some of the men turned to banditry since they didn't accept human leadership; Some of whom the group encountered before. He then proposes they form an alliance out of his and Atlanta Alter's concern for the potential discord between their factions. Billy suggests using Shanshan, a domesticated Demonic Beast which detects magical energy through scent, as a messenger. It cannot learn Atlanta Alter, Ritsuka, and Patxi's scents though. Atlanta Alter because her scent is too similiar to Demonic Beasts; Ritsuka because their Mystic Code blocks their scent; Patxi because he is a Yaga. Billy therefore decides to join the rebels instead. Beowulf then warns the Oprichnik in Yaga Moscow have strength on par with a Servant, suspecting it's related to their faith in Ivan. He proposes his men will attack the capital to draw the Oprichnik's attention to give the rebels an opening. However, Ritsuka, Mash, and Da Vinci are concerned about Kirei, Koyanskaya, and the Grand Duchess that attacked Chaldea.

Joined by Billy, the group return to the rebel stronghold. Avicebron however warns they're nearly out of food. Atlanta Alter reveals her rebels revolted when they stopped receiving food from the capital. The capital also laid claim to any hunted Demonic Beasts. The rebels hunted with the other villages to get by before their population outgrew their food suppply. Atalanta Alter then reveals they have a hidden storehouse only select few knew about. The Oprichnik burned it downed though, and killed the Yaga managing it. Since the Oprichnik have no need for food, it leads to further speculation they're Ivan's Noble Phantasm. Atalanta Alter then reluctantly proposes they steal from the pro-Ivan city of Yaga Smolensk, Patxi's hometown. Ritsuka orders to keep damage to a minimum when Avicebron warns the situation could turn into a massacre. Avicebron also suggests they gather materials to build a wall of golems while the rebels prepare. Afterwards, Billy has Shanshan learn Avicebron's scent. The group then return to the stronghold where the rebels are now ready.

With the rebels taking several positions in Yaga Smolensk, the group quickly kill the Oprichnik before negotiating with the mayor. Atlanta Alter demands 60% of the town's food supply before taking it down to 50%. However more Oprochnik suddenly arrive, and begin massacring rebels and civilians alike. The rebels and civilians nearly get into a skirmish when a rebel shot a civilian after mistaking his broom for a weapon. Atalanta Alter stops them, and orders her rebels to aim only for the Oprichnik. Avicebron then arrives, and his golems collect the weapons and kill the Oprichnik. The group then retreat after the rebels get about a third of their intended target. Patxi deserts however after killing a civilian for saying his mother was stoned to death when he joined the rebels.

Back at the stronghold, Atalanta Alter warns Yaga Tula is under attack by the Oprichnik and a Servant. Avicebron alters the golems at the stronghold so they can follow simple orders from Atalanta Alter while he and the others are gone. Before the others leave, she reveals the Servant is Wolfgang Amadeus Mozart. Meanwhile, Patxi is captured by the Oprichnik and Kirei.

After resting in a cave for the night, the group see a neighboring village has been destroyed. Ritsuka notes it looks similiar to the aftermath of Tunguska event^WP. The group then arrive Yuga Tula by nightfall. Avicebron eavesdrop on the civilians to learn there is a Servant in the church. However the group find it empty, but the Servant only left recently. Eventually the Servant believed to be Mozart, Amadeus Alter, arrives in front of the church waiting. Once the group exits the church, he attacks them knowing they're Chaldeans. Billy shoots off his mask to reveal he isn't Mozart, which is confirmed by a Spirit Origin analysis. Kadoc then arrives, and reveals Amadeus Alter is Antonio Salieri. He reveals the Cypters' goal is to grow their Lostbelts and end the Proper Human History. He then orders his Oprochnik to kill the group. After they're killed, he then calls for his Servant, Caster, the Grand Duchess. She reveals her True Name is Anastasia Nikolaevna Romanova, and proceeds to attack the group. During the fight, she uses Viy Viy Viy to destroy Avicebron's golems. Salieri then wakes up, and unleashes Dio Santissimo Misericordia de mi on her. After she blocks it with Viy, he accuses her and Kadoc of brainwashing him. Kadoc denies this, and orders Anastasia to crush Salieri's legs. He protects her however when Avicebron's snow golems attack her. He orders the Oprichnik to follow the group when they escape with Salieri.

The group set camp at a village recently destroyed by the Oprichnik. Sherlock explains Lostbelts differ from Singularities because their history continues past the point of divergence. They are also similiar to culled parallel worlds, and they're currently encroaching on the proper history. Salieri reveals he is a Rogue Servant summoned by the remnants of the Counter Force. His memories of the proper history were corrupted though by those of the Lostbelt. He explains he was the court musician in Yaga Moscow, whose only interaction was with Metropolitan Macarius. The group realize he is Kirei based on Salieri's description of him. Salieri recalls overhearing Kirei calling the Fantasy Tree the cornerstone of the Lostbelt. He warns though it is protected by Ivan and his Oprochnik. After speaking with Sherlock alone, Salieri agrees to join the group on the condition he's allowed to kill Mozart.

The group return to the rebel stronghold. Atalanta Alter has tracked down magical ore and a jewel able to control golems. She agrees to share the information if the group helps construct a new stronghold. She wants it built at a ravine between the current stronghold and Yaga Moscow. It is protected by a large forest inhabited by vicious Demonic Beasts. She previously didn't considering moving there because its natural defense would make attacking the capital difficult. However this changed when her scouts discovered an incomplete tunnel that cuts through the forest. It can allow the rebels to reach the capital in a day once it's complete; it also has magical ore.

Arriving at the under constrution stronghold, Atalanta Alter divides her Yaga into lumberjacks and tunnel excavators. With the new stronghold complete, Atalanta Alter readies to contact Beowulf in preparation for the attack on Yaga Moscow. While Salieri stays behind, the group return to the Shadow Border.

While the Shadow Border is being repaired, Kirei and the Oprpchnik launch a suprise attack on the rebel stronghold. They learned of it from Patxi, and bypassed its natural defenses through a Noble Phantasm. The group eventually learn of the attack from a message from Salieri sent via Shanshan. They soon arrive at the stronghold to disover half of the rebels missing. Kirei confronts them, and confirms the Oprichnik are Ivan's Noble Phantsm, Chyornyj Oprichniki. He also confirms his status as Psuedo-Servant, claiming his True Name is Macarius, Ivan's mentor. Confirming he captured the rebels, Kirei reveals Patxi betrayed the others when faced with Ivan. He then calls for Minotauros, who had eaten the rebels with the exception of the 1/5 captured. Mintotatuos then seperates the group with his Noble Phantasm, Chaos Labyrinthos. While the others struggle to escape, Avicebron was isolated from the labyrinth by Kadoc so they can speak without interference.

Meanwhile in the labyrinth, Ritsuka and Billy encounter Patxi. Admitting to his betrayal, Patxi reveals Kirei tossed him into the labyrinth once he gave the whereabouts of the new stronghold. The others then reveal to him that they're from the Proper History, where the events of the Lostbelt never occured. While trying to escape, the group become surrounded by the Oprichnik. Fortunarely they're saved by Miyamoto Musashi. She explains she had multiple hostile encounters with the Yaga since she wandered into the Lostbelt. Billy realizes she is the rumored human killer. He then figures they can use the sounds of his bullets to find their way around. He asks Musashi to listen to the sound differences, but Patxi agrees to do it instead. Eventually the group able to find their way out.

Outside, the group learn Musashi's existence is unstable, even while contracted to Ritsuka. Beowulf then arrives, having learned of the attack from his men watching the stronghold. Billy proposes they wake up Ivan since he can only summon the Oprichnik while sleep. Beowulf then orders his men to attack Yaga Moscow, but Billy suggests he serve as a decoy also. After his men leave, Beowulf joins the group. He then reveals Atalanta Alter and Salieri were captured. Atalanta Alter had given herself up when some children were taken hostage, with Salieri following her lead. Beowulf's men learned they're being held in prison fortress beyond the capital. Sherlock deduces that others are trying to keep Ivan asleep, and warns the slighest disturbance in the capital could wake him. The group drive the Shadow Border to the prison, but they find no one there. However, they find a note from Kadoc stating Atalanta Alter and Salieri are to be executed in Yaga Moscow in five days. The group then proceed to Yaga Moscow to stop the execution.

As Billy fights the Oprochnik alone with his gun upgraded by Da Vinci beforehand, the other infiltrate Yaga Moscow. They stop Minotauros from executing Atalanta Alter, but he traps them all in his labyrinth. However that was part of the group's rescue plan, and they use this oppurnity to kill Minotauros. Avicebron then appears, and confesses he wants to use the labyrinth to build Golem Keter Malkuth. However he lacks a core sufficiently strong enough to fight Ivan, so he chooses himself to be the core. He then gives Ritsuka control of Adam before he becomes its core. The labyrinth then proceeds to reconstruct into Adam.

• Ivan the Terrible awakens
• Ivan and Adam fighting
• Ivan preparing to fire upon the palace

1/3

Meanwhile, Anastasia reveals Ivan's awakening from Adam's construction will allow the Fantasy Tree to start absorbing the land's mana. She then starts killing the Oprichnik when she announces her intent to kill Ivan. It also revealed Mozart had played Requiem for Death for the past two months to keep Ivan asleep. Before he disappeared, he had Salieri take over for him. The Oprichnik then all disappear with Ivan's awakening. Kirei reveals Ivan is fused with an ancient primodial beast discovered in Russia's tundra, which caused him to continue growing. Ivan then finally awakens, and emerges infused with a mountain-sized mammoth-like creature. Kadoc proposes to the group that they work together to defeat Ivan, suggesting they target his true body at the mammoth's head. While the others leave to hold off Ivan, Ritsuka commands Adam to attack him. None of them can even scratch him however. He then attacks the palace when Salieri starts playing Dies Irae^WP from there in an effort to kill him. He then prepares to destroy the palace and Ritsuka both when they order Adam to block him. Fortunately Mash, now using the Ortenaus system, arrives to block the blast. She then blocks another blast with Mold Camelot, the light of which distracts Ivan enough to lower his trunk. Musashi uses this chance to cut off with Six Realms Five Planes - The Divine Figure of Kurikara, disappearing immediately afterwards. Ritsuka then uses this opportunity to have Adam rip Ivan out of the mammoth. The mammoth is rendered inert, and Adam falls apart.

Anastasia declares she will now rule the Lostbelt. Ivan briefly fights her to prove she has the strength to rule. After she defeats him, he leaves to speak with Ritsuka. Kadoc then reveals the Servant possessing Kirei is Grigori Rasputin. Kirei however reveals that is no longer the case, as Rasputin left after Anastasia took the throne. With his connection with Russia gone, Kirei leaves after agreeing to Anastasia's request. She and Kadoc then leave to usher in her rule. Atalanta Alter and Beowulf leave to meet with the others.

Ivan asks Ritsuka if they're truly willing to destroy his world to save their own. Despite his wounds, he fights the group when Ristuka isn't able to answer. After he disappears with his death, Kadoc then arrives and orders Atlanta Alter to kill the others. He reveals she agreed to kill them once Ivan was dead. Atalanta Alter confesses she is betraying the others because she refuses to abandon the Yaga. As the group fight Atalanta Alter, her rebels fire at Ritsuka. Patxi however shields them, telling them to save their world become sucumbing to his wounds. Billy then arrives and challenges Atalanta Alter to a duel. She loses, and begins to disappear from her wounds. She confesses she knew the Lostbelt would have to disappear, but the rebels knew this already and accepted it. Atalanta Alter then disappears agreeing with Patxi's last request. Kadoc then declares the Fantasy Tree Orochi has finally connected, so now he can finally expand the Lostbelt. He reveals Ivan refused to let Orochi take root through the use of the power to control the Lostbelt, the Emergency Prerogative, opting to sleep instead. Kadoc thus condocted a plan to have Anastasia assume the throne and gain that power herself. He and Anastasia then proceed to fight the group. After they're defeated, Kadoc tries to use the Sirius Light to rewrite the Lostbelt. Billy shoots at him, only for Anastasia to shield him. After she disappears, Billy knocks Kadoc unconscious. The group prepare to bring him to the Shadow Border when Orochi begins releasing True Ether. Da Vinci sends the Shadow Border's extra magical energy to the group so they can ascend and stop Orochi.

• The Priestess of the Alien God appears
• Orochi frozen and shattered by the Priestess

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The group stop Orochi, but they lack to means to destroy it. The Priestess of the Alien God then appears at its roots, and freezes and shatters it with a touch. Mash retrieves an imitation Holy Grail from its remains. With Orochi gone, the Lostbelt begins to disappear. After Patxi is buried, Beowulf and Billy disappear, and Salieri leaves for Yaga Moscow. Sherlock concludes the storm wall is connected to the Fantasy Tree in each Lostbelt since it vanished with Orochi's destruction. Ritsuka and Mash then return to the Shadow Border with Kadoc in their custody. Meanwhile in Yaga Moscow, Salieri plays Twinkle, Twinkle, Little Star^WP for the Yaga in honor of Mozart's request. He promises to continue playing until the Lostbelt disappears. In the meantime, Chaldea crosses Russia's border to find the world is now completely blank. They then receive a coded transmission from a mage named Baldanders currently waiting for more surviors at the Wandering Sea.

Participants

Servants

Designation	Identity	Affiliation
Caster	AvicebronWP	Ritsuka Fujimaru
Berserker	AtalantaWP (Alter)	Rebels
Archer	Billy the KidWP
Berserker	BeowulfWP
Avenger	Antonio SalieriWP
Saber	Miyamoto MusashiWP	Ritsuka Fujimaru
Caster	Anastasia Nikolaevna RomanovaWP	Kadoc Zemlupus
N/A	Koyanskaya	Crypters
N/A	Grigori RasputinWP	Crypters
Berserker	MinotaurWP
Rider (Living Hero)	Ivan the TerribleWP

Non-Servants

Designation	Identity	Affiliation
Crypter	Kadoc Zemlupus	Crypters
Yaga	Patxi	Ritsuka Fujimaru
Fantasy Tree	Fantasy Tree Orochi	Alien God