Tunguska (AngieYaz Sonic Underground reboot)

Tunguska is a location featured in the AngieYaz/RoseOfSharon reboot of the Sonic Underground television series, emigrated from the TYPE-MOON video game series. It is the Reality Marble of Tamamo Vitch Koyanskaya manifested upon the blank world in a similar manner to a Singularity or Lostbelt during the Human Order Revision in Fate/Grand Order. It originated in the Tunguska region of Russian in 1908. It takes place after the British Lostbelt, and deals with Chaldea's final battle with Koyanskaya and her NFF Services.
==Description==
Tunguska Special Sanctuary is a paradise with no foreign intruders and a hell filled with weapons striding in order to kill humans. Da Vinci says that this domain should be collapsing on itself. However, Taigong Wang says that in the real world, that would be the case, but there’s a loophole. This entire special domain including the shell is most likely Koyanskaya herself. Her Saint Graph is expanding endlessly and enshrines herself within the old Tunguska forest region.
The creatures, plants, and war-beasts; the creatures of this world do not mate at all. They don’t grow up, they don’t obtain any experience, their genes don’t combine and they do not transform. Every creature within this domain are siblings that have been given birth out of one mother.
However, there is only one life cycle. The cycle is known as the food chain. Birth, life and death. Eat, be eaten, kill and be killed. The difference here is the creatures here have been born out of one person, Koyanskaya. Everything, everything is created with a decided form. The natural cycle that is the food chain is the same. The cycle of brutality and cruelty filled with slaughter is the same. Either one is equally the same. They are born from Koyanskaya, so naturally they’ll return back to Koyanskaya as well. This world is definitely closed off.
Da Vinci states that no matter how twisted this world is, this is how Koyanskaya perceives the world which is her mental state. Since the natural laws of the world are useless within this domain, Da Vinci deduces that Koyanskaya can do anything outside the information that was discussed.
==History==
Chaldea heads for Tunguska to defeat Tamamo Vitch Koyanskaya, now presumably weaker than ever thanks to absorbing Cernunnos' curses, before she fully matures into a Beast. It is also an operation for adjusting the Black Barrel and a test case for the attack on the South American Lostbelt. The plan for this operation is for Ritsuka and Mash to descend from the Storm Border once it's close enough, accompanied by more than 10 Servants. Ritsuka's party will then quickly move towards Vitch's position and destroy her. At the moment, Sherlock Holmes has six carefully selected Servants waiting in the second briefing room.
The Storm Border soon pierces through Tunguska's barrier. But a soon as Chaldea enters the special territory, all the Servants become extremely weak. Even the Black Barrel goes dormant, causing its guardian, Habetrot, to disappear. At Sherlock's urging, Leonardo da Vinci checks the second briefing room and finds the Servants are returning to being mere Spirit Origins one after another. Similar to the British Lostbelt, Tunguska is a realm that denies human history. The only ones not affected are living humans and Da Vinci since she is essentially a living Servant in the present. Because of his two Spirit Origins, Captain Nemo has more time than other Servants. He will use that time to get the Storm out of Tunguska. Meanwhile, Ritsuka, Mash, Da Vinci, Jingle Abel Meuniere, and Goredolf Musik will head into Tunguska on the Shadow Border.
The Shadow makes an emergency landing. Everyone then sees Ibuki-douji has joined them. Da Vinci realizes that only non-human Servants can manifest in Tunguska. But Ibuki doesn't remember her True Name, nor the nature of her being. Da Vinci suspects Ibuki's memory became abnormal in exchange for maintaining her form. Ritsuka, Mash, and Ibuki are then sent out to investigate.
Increasing her size to three meters, Ibuki carries Ritsuka and Mash as she runs on ahead. But she stops upon sensing a large enemy presence. After the enemy is defeated, Ibuki returns to her regular size. Ritsuka and Mash notice that the enemy resembled the Yaga from the Russian Lostbelt and the Kali from the Indian Lostbelt. But they seemed lifeless, with no anger nor fear in them. Three giants then appear before the group. Considering them truly formidable, Ibuki decides to use her full power on them. Habetrot even manifests from the Black Barrel to permit its usage.
After slaying the giants, Ritsuka and Mash recall how Vitch took creatures from one Lostbelt and brought them to another as her minions. A voice calls them Lost Familiars, saying the ones stationed in Tunguska automatically attack whoever they consider enemies. Ritsuka's party is cautious, thinking it's another enemy ambush. The voice's source unveils himself and asks the group to leave the elimination of Daji's shadow, who's trying to usurp Beast IV, to him. His companion then shows herself and introduces herself as Dobrynya Nikitich. The man introduces himself as Taigong Wang. He confirms he and Nikitich are Stray Servants, though he's had to utilize fangshu to keep himself from disappearing. He knows Chaldea has come to Tunguska to eliminate Vitch before she fully matures into a Beast, and for the sake of his lending strength, he has waited for their arrival. But Nikitich isn't so ready to lend them her strength. She wishes to test their strength herself, even though she already saw them defeat Lost Familiars earlier.
Nikitich eventually starts attacking Ritsuka's party from the air on her horse turned wyvern mount. Tiangong uses his fangshu on Ritsuka and Mash so they float like Ibuki can and fight Nikitich on my equal ground. He will also be joining them on his own mount, Sibuxiang. Eventually, Ibuki, utilizing Mash's shield as a springboard, slashes the wings of Nikitich's wyvern. With it impossible for her to continue their aerial duel, Nikitich concedes victory to Chaldea for now.
Back on the ground, Taigong has Ritsuka's party join him and Nikitich in taking on what he calls a highly exceptional unit. The group moves on ahead and is soon caught in a lightning-filled blizzard. There they see a recreation of Ivan the Terrible, dubbed "AN602-Ivan". The group moves to eliminate him, with Habetrot appearing to allow Black Barrel's usage.
After Ivan is slain, Taigong explains there are two types of hostile lifeforms in Tunguska. First are the mass-produced recreations of the creatures from the different Lostbelts known as Lost Familiars. Second is the individual hostile entities like the recreated Ivan from earlier known as Lost Weapons. Then, moving onto a river, Taigong explains the Lost Familiars have two types of behavior. They are either standby at accumulation points or patrol along a certain route. The group is far off from either, so it's relatively safe. Taigong then reveals he was summoned to eliminate Vitch, and for that, he wants Chaldea's help. After confirming Vitch's forces are comprised of what she acquired from the Lostbelts, Taigong explains the six species of Lost Familiars are active in small numbers around patrol routes. Lost Weapons, meanwhile, exist for base defense and to be deployed in abnormal situations. Because they control the leylines, they keep reappearing every time they're slain and provide an inexhaustible supply of familiars. But their regeneration will be delayed for a while if they're struck down thoroughly. Taigong then reveals the Lost Weapons are completely autonomous from Vitch. Therefore, the group is unlikely to be noticed, unless they're near Vitch's "castle" in the center.
Chaldea wonders what principle does Tunguska employs to force out human Heroic Spirits. Taigong wants to tell them, but first, he wants to show them two locations. Both of which will give them a better understanding of Vitch and explain why Nikitich and Ibuki aren't being forced out.
Flying to avoid conflict with the Lost Familiars, the group eventually reaches their destination, a canyon. There they find creatures that are neither native to the original Tunguska nor Phantasmal Species. Goredolf notes the lack of a feeding ground nearby, to which Taigong reveals they mainly hunt in forests and rivers by species with the role of hunter. Taigong then explains the creatures form communities that make them comparable to humans. Mash thinks they're similar to the Yaga, but Taigong assures that they were never human. He then reveals every living thing in the special territory is a new species. But in terms of both composition and ecology, Taigong declares they shouldn't exist. To corroborate what Taigong said, the group made a series of observations and sample collections. The samples are collected in the Ortenaus shield, and their data is sent to the Shadow Border at regular intervals for real-time analysis. After an hour, Chaldea comes to understand that there are absolutely no signs of humans in the special territory. Taigong calls the environment they've observed the Life Zone, a paradise where the only violence is the food chain. But there also exists its polar opposite.
Taigong takes the group to an area he has dubbed the Dead Zone. There they witness bizarre creatures mounted with what appear to be conventional firearms killing each other in an endless cycle. Taigong calls these creatures war-beasts and confirms Koyanskaya created them to eradicate humanity. He then corrects Da Vinci's earlier analysis that the war-beasts have poor detection range, adding that it doesn't apply to their natural prey: humans. The war-beasts then attack the group. It soon becomes too dangerous for Ritsuka, so Nikitich takes them into the air to create some distance. But anti-air fire forces her to return to the battlefield and eliminate the war-beasts.
The group eventually eliminates the war-beasts, though there is still great concern that more will come. Taigong then confirms Lost Weapons also exist in the Dead Zone, revealing brought them near its base on purpose. Mash asks him if there are signs like the blizzard with the recreated Ivan. Taigong directs everyone's attention to the sky and explains a chasm will open up in the sky if the Lost Weapon detects an intruder. Though it looks like the false sun of the Norse Lostbelt, it is in truth a hole in space from which a recreation of Surtr, Lost Weapon R-36M2-Voevoda, emerges. The group moves to eliminate him, with Habetrot appearing again to allow usage of the Black Barrel.
After Surtr is eliminated, Taigong uses his Tudun technique to transfer everyone back to the river in the Life Zone. They then set up camp while waiting for the Border crew to rendezvous with them. Taigong reveals the Tunguska Special Territory is Koyanskya's Reality Marble. While Reality Marble can't normally be maintained for long periods, Koyanskaya got around that limitation by expanding her Saint Graph to cover Tunguska. Taigong then reveals all living species in the Special Territory, including the war-beasts, are all born and reborn from Koyanskaya. They cannot interbreed, grow, learn, or evolve, and they have no ego or sense of self.
The group later rendezvouses with the Border crew. Ritsuka forms a temporary contract with Taigong and Nikitich. As they head for Tunguska's center, Taigong assures Koyanskaya will not move from there as Daiji never leaves her residence. He also reveals Koyanskya's coordinates are the same as the epicenter of the Tunguska Explosion, making Ritsuka wonder if there is a connection between her and it. The group then discusses their chances of victory against Koyanskaya. Goredolf fears the possibility that she may already be a fully matured Beast. But Taigong says that is impossible because despite Koyanskaya being Daiji's shadow, the group can move relatively freely in her territory. However, he considers it possible that she was debilitated by an incident. Ritsuka, Mash, and Da Vinci realize that Koyanskaya absorbing Cernnunos' curses was the cause. Taigong then reveals he has an Anti-Beast Noble Phantasm designed to affect Daiji, including her shadow. Koyanskya then suddenly appears inside the Border. Taigong is shocked to see Daiji's shadow outside her place of residence. He transports her, himself, Ritsuka, Mash, Ibuki, and Nikitich outside.
Mash finds herself equipped with the Ortinaus, to which Taigong admits did so with his Tudun technique. Koyanskaya, in response to the group's combat readiness, summons waves of Lost Familiars and war-beasts. Taigong decides to hold off Koyanskaya while the others eliminate her minions. The others soon become at risk of being overwhelmed. Taigong, therefore, decides to use his Anti-Beast Noble Phantasm, Great Demon Sublimation – Investiture of the Gods, on Koyanskaya. But to his absolute shock, it has no effect. Koyanskaya, in response, decides to eliminate the group herself and disperses her children. She then turns into the Beast form she took on during Chaldea's encounter with her on Olympus. Taigong uses his second Anti-Beast Noble Phantasm to protect the group. The group then ready themselves to fight Koyanskaya, with Habetrot once again appearing to allow the Black Barrel's usage.
Taigong soon realizes the Koyanskaya they're fighting is an off-shoot of the real one. Koyanskaya undoes her transformation and calls upon her minions to eliminate the group. Her minionsappear in greater numbers than previously destroyed. Taigong instantly transfers the others into the Border and tells Goredolf to drive far away. He then convinces Koyanskaya that it will be pointless for her to pursue the Border as he'll bail them out with Tudun whenever she gets close. Koyanskaya decides not to bother and returns her headquarters, saying she'll "entertain" the group herself when they come.
Afterward, Taigong transfers himself to the Border and apologizes for his blunder. He then notes how only his Noble Phantasm's secondary effect, which affects the exterior, worked on Koyanskaya, albeit very minimal. The primary effect, which affects the interior, meanwhile had no effect at all. Taigong, therefore, concludes that Koyanskaya is not Daiji's shadow. Taigong then deduces Koyanskaya trying to become her own nine-tailed Golden White Face is why she's yet to reach maturity. He also reveals the process by which Koyanskaya converts life forms of the Lostbelts into her familiars renders their existences into her tails. This presumably explains why the mass of her Saint Graph is so massive. Taigong says Koyanskaya converted creatures from six Lostbelts into her tails, but Rituka only recalls her having five. Da Vinci assumes that Melusine severed the tail Koyanskaya collected in the British Lostbelt during the fight in the Lake District. Though their chances of defeating Koyanskaya seem dire, Taigong believes he can find a solution. Then, after revealing he has removed the properties of his Noble Phantasm that target Daiji's shadow, he has everyone huddle together and places a voice-canceling ward so Koyanskaya can't hear. He then explains his plan to stop Koyanskaya based on the fact that Tunguska is a Reality Marble.
Chaldea heads for the center through the Dead Zone, breaking through the war-beasts in their way. As they near the center, Da Vinci is surprised that Koyanskaya's headquarter isn't protected. Taigong assumes it's because she wanted somewhere quiet to rest after she unintentionally debilitated herself absorbing Cernunnos' curses. Ritsuka's party then exit the Border and head for Koyanskaya's headquarters, the NFF Headquarters building. There they're greeted by an anthropomorphic rabbit capable of human speech named PB. Koyanskaya assigned him to the group's guide and designed him to be the only pseudo-lifeform in the territory capable of human speech. He then escorts the group into the building.
PB escorts the group to the main hall and asks them to wait for Koyanskaya to come. He leaves, and Koyanskaya soon arrives. Koyanskaya confirms her objective is humanity's extinction, though she'd rather happily watch the Alien God do so rather than do it herself. She then reveals the full extent of her Beast form, declaring the position of Beast IV is hers. Since the Beast of Comparisonh was absent, Koyanskaya says it was inevitable for the Beast of Cherishment to take its place. Taigong realizes from her magical energy levels and the scale of her Saint Graph that Koyanskya is forcing herself to completion, even though Cernunnos' curses remain and she doesn't have enough tails. He then activates Yuxu Embodiment - Investiture of the Gods to give the group some protection against Koyanskaya, believing it will work since she modeled herself after Golden White Face. Everyone then gets ready to face Koyanskaya, with Habetrot reinforcing the Black Barrel to maximum power.
It is revealed that Koyanskaya is a Nature Spirit born from the convergence of the pain and anguish of the animals and nature that perished in the Tunguska Explosion. Someone had named Yaskaya, but lack of memory caused her to corrupt it into Koyanskaya. Then, in 2017, she incarnated in place of Beast IV's vacant position. With cherishment being her nature as an Evil, Koyaskaya sought to understand a mother's love. But being a solitary existence, she decided to adopt children. Imitating Golden White Face and deciding her children cannot be of the Human Order, Koyanskaya traveled to the Lostbelts and assimilated creatures from each into her tails. With the information she acquired, she gave birth to many lifeforms and formed her sanctuary.
Nikitich and Taigong unleash their Noble Phantasms on Koyanskaya, restoring the distorted space to normal. Ritsuka then empowers Mash with two Command Spells. To Koyanskaya's surprise, Mash comes from above and hits her with a Bunker Bolt. Nikitich had flung Mash earlier, taking advantage of the room's high ceiling. Koyanskaya's transformation is undone, but she mocks the group for thinking they won and calls forth 999 war-beasts. The war-beasts aim their guns toward Ritsuka. At Nikitich's urging, Ritsuka empowers her with their last Command Spell. Nikitich then activates Belza Damask and shields Ritsuka from ensuing gunfire. Fortunately, she survives thanks to Koyanskaya's Authority as a Beast, Nega-Weapon, being less effective against Heroic Spirits, especially those closer to nature like herself. Ibuki quickly moves behind Koyanskaya, threatening to decapitate her if she doesn't end the battle now.
Taigong uses his Sage Art to analyze Koyanskaya's Spiritual Core and comes to understand that the Special Territory's center is her veiled heart. He also learns of her true nature and reveals this to everyone. He claims that while Koyanskaya hates humanity, she is rather apathetic about bringing about their downfall. This is because her grudges come from the accumulated thoughts of the animals that blamed humans for the Tunguska Explosion. Koyanskaya, with her dream of becoming a Beast shattered by Chaldea, threatens to self-destruct and take everyone with her. But Taigong proposes an option where everyone can live and invites Koyanskaya to accept it since she is apathetic towards humanity. But Koyanskaya explains that her Special Territory will remain rooted in Tunguska until she reaches maturity as a Beast. As long as it remains, it will cause an error in the restoration of the Human Order. Taigong proposes moving the Special Territory to a domain outside the Human Order, outer space. He explains that he will freeze Koyanskaya in space-time, then launch her into space. He also set up a technique to automatically unfreeze once she reaches a safe haven. But space travel wil be impossible unless she is shrunk down into a much smaller size, even though the mass won't change. As for the space-time freeze, Taigong slow down Koyanskaya's processes to their utmost limit to achieve a similar effect. He then starts to preparing a Xian-level technique to achieve his propsoal. Koyanskaya reluctantly accepts it after Ritsuka tells her that it will benefit both side. Then, with Ritsuka's magical energy supporting him, Taigong unleashes his technique. Particles eventually permerate throughout the entire domain and envelop Koyanskaya. Taigong explains space will be compacted until it is an "egg", similiar to a World Egg. He has also programed it to automatically launch into space simultaneously with the restoration of the Human Order. Koyanskaya warns Chaldea that she will break out of the egg and restablish her domain if they fail in their mission. The Special Territory is then fully condensed into the World Egg.
Everyone finds themselves back on the blanked Earth, with no trace of the Special Territory to be seen. Nikitich asks Taigong where the World Egg is. Taigong answers that it's hidden in space-time, though not as far as the Imaginary Number Space. He says the egg will automatically launch without anyone's notice once the sky is cleared of the roots of the Fantasy Trees. But Ritsuka wonders why Koyanskaya became a Beast if she had no love for humanity. Taigong confesses that he lied about Koyanskaya not caring about humanity earlier. But while she loathed humanity and was eager for their extinction, she, in some way, loved them as a part of nature. Ritsuka and Mash believe Koyanskaya didn't want to hate anymore, and that is why she chose to leave for the stars. Taigong disappears followed by Nikitch.
It is later that it was Nikitich who gave Koyanskaya the name Yaskaya, having been summoned through a connection with a sun goddess shorty after her birth.
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