Heian Distortion

The Heian Distortion is a distortion which would have become a Singularity if left unchecked. It was located in Kyoto, Japan and the fictional island of during the Heian peroid.
Chaldea's visit to this distortion was covered in two events of Observer on Timeless Temple; and Onigashima: The Great Tale of Demons.
==Setting==
The distortion was created by Minamoto-no-Raikou using the Holy Grail and the Authority inherited from her ancestor, Gozu Tennou, when she turned into her oni self, Ushi Gozen, as a result of absorbing too much divine energy. Afterwards, Ushi decided to construct a place where Sakata Kintoki can be safe from the scorn of the human world. She then drew the island Onigashima into existence and created its oni in the same matter. These oni were the same as the ones she drew for Kintoki during his childhood. Not all the oni were drawn well though with the better ones being called Onimaru and the others being compared to scribbles. While the Onimaru served as gatekeepers, the lesser oni were used to further the island's construction along with the humans they enslaved.
Sometime after its creation, Shuten-douji and Ibaraki-douji woke up in Kyoto. They found the Grail in front of them filled with wine. After they drank it, the wine soon vaporized and spread throughout Kyoto causing its citizens to become drunk. Meanwhile, the wine grants the wishes of Shuten and Ibaraki's heart, but their wishes are twisted by it. Shuten wished to have fun with Sakata Kintoki again, causing him to be summoned into the distortion. Ibaraki wished to go on a rampage with Shuten, but it was twisted into going on a rampage with her power. As a result of the wish, Shuten's power was absorbed into Ibaraki, eventually causing her to become unconscious. Then, in a panic, Ibaraki captures her and shut herself behind a large gate.
==History==
===Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams===
Ritsuka and Mash arrive in the distortion when they notice a strange aroma. Romani Archaman informs them they’re possibly in the Heian Era. Sakata Kintoki then appears and joins the pair. He reveals they’re in Kyoto. Romani reports the aroma was wine and directs the group to the source of the abnormality. He figures Kintoki was forcibly summoned into the distortion.Fate/Grand Order - Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams, Prologue - Cherry Blossom Front Lines of Heian Period
Traveling through a residential district on their way to the abnormality’s source, the group finds Kyoto covered in an alcoholic mist that affects even Mash. The city is also empty, other than drunk citizens and corpses on the street. The group soon comes to a large gate, where Kintoki realizes the mist and chaos in Kyoto were caused by an Oni. Ibaraki-douji then appears and shows an unconscious Shuten-douji. She intends to sacrifice her, but Kintoki believes Shuten will eat her from the inside. In response, Ibaraki summons the Great Grudge of Rashoumon, and attacks the group. She and Kintoki are evenly matched, so she retreats beyond the gate. Left fatigued by the fight, the group leave to recover before trying again tomorrow.Fate/Grand Order - Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams, Chase Battle - Back from Zero
After another failed attempt to defeat Ibaraki, the group retreat to the field they first arrived in. There they report their progress to Romani. Asked by him, Ritsuka reveals that Mash is still drunk from before, though she doesn’t seem affected during battle. Romani reveals the alcoholic mist will not disappear until its source is destroyed. He then tells the group his plan to do so.Fate/Grand Order - Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams, Chase Battle - Drunkenness and Relaxation 
The next day, after fighting Ibarki again, Mash realizes they don’t need to defeat her to solve the distortion. They only need to destroy the source of her power beyond the gate first. However, a sinister fog-like thing prevents them from climbing over the wall. On Ritsuka’s suggestion, the group searches for any detour that can get them past the gate. They eventually find an enormous cliff on Kyoto’s west end. They see the topography differs from regular Japan. They also notice an island in the distance. Unable to find a detour, the group realizes they have to continue fighting Ibaraki.Fate/Grand Order - Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams, Chase Battle - Alcoholic Fog in the Demonic Capital
After two failed attemptsFate/Grand Order - Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams, Chase Battle - The Circumstance of the OniFate/Grand Order - Rashomon: The Devilish Capital of Restless Spirits and Drunken Dreams, Chase Battle - Shuten's Memories, the group nearly defeat Ibaraki. However, she unleashes her Noble Phantasm, and escapes when it's blocked. With Ibaraki near defeat, the group prepares for the decisive battle.Fate/Grand Order - Rashomon: The Devilish Capital of Restless Spirits and Drunken Dreams, Chase Battle - Ibaraki's Obstinacy
The next day, Kintoki defeats Ibarki with Golden Spark. He then realizes the reason she captured Shuten and gave alcohol to the humans was that there was too much for her.Fate/Grand Order - Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams, Showdown - Defeating the Oni After Ibaraki retreats, Shuten finally wakes up. The group tries to fight her when she blocks Kintoki’s axe at the last second. She deduces her weakened state is due to Ibaraki absorbing her power. She then takes the group to the source of the abnormality, the Holy Grail.Fate/Grand Order - Rashoumon: The Devilish Capital of Restless Spirits and Drunken Dreams, Conclusion - Awakening From a Drunken Dream
There she explains that the Grail was already filled when she and Ibaraki woke up. They both drank the wine, but Shuten’s power was siphoned into Ibaraki after she fell into a sleep from too much drinking. Shuten reveals the wine grants wishes through the Grail’s power, though those wishes get twisted first. The wine soon vaporized and spread throughout Kyoto, causing its citizens to get drunk from the mist. Ibaraki’s wish was to rampage with Shuten, but it was twisted into rampaging with her power. After Shuten destroys the Grail and disappears, Mash realizes Kintoki was summoned because Shuten wished to have fun with him again. She wonders who placed the Grail before the oni and filled it with wine. Kintoki figures something else will happen if the mastermind is still around before disappearing. Ritsuka and Mash then return to Chaldea.
===Onigashima: The Great Tale of Demons===
Arriving in the distortion, Ritsuka and Mash are told by Romani Archaman that they’re on the island they saw in Kyoto. The island’s shape shocks Ushiwakamaru when the group is attacked by an Oni. After killing it, they realize the island is Onigashima, the legendary island of the Oni. Romani cannot pinpoint the island’s temporal coordinates, similar to Kyoto. He speculates the island was created as part of the abnormality when Ushiwakamaru mentions Onigashima never existed in her lifetime. Romani then orders the group to investigate the island’s creator and tells the Singularity response is at the island’s peak. Ushiwakamaru reports to Ritsuka that she found a Servant lying unconscious on the beach. The group slays the oni surrounding him, and he regains consciousness. He introduces himself as Fuuma Kotarou and helps the group kill more oni. However, they’re soon surrounded, so Kotarou decides to use his Noble Phantasm to create a diversion. Ushiwakamaru warns, though, that they lack the strength to break through the oni. Suddenly though, Sakata Kintoki jumps from a nearby cliff on a motorcycle and helps slay the remaining oni.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 1: Three Animal? Companions
Proceeding to a mountain pass, Kotarou reveals he was summoned rather recently. He planned to observe and study the oni’s behavior, hoping to unlock his sealed Noble Phantasm that transforms him into an oni. However, the oni overwhelmed him as they kept calling for reinforcements. After agreeing to help solve the mystery of Onigashima, Kotarou and Kintoki do some recon, while the others check the area. Mash and Ushiwakamaru spot a forced human labor camp run by oni. Kotarou returns and reports there are more forced labor camps. As liberating every camp is unrealistic, he suggests eliminating the mastermind. He reports he found a way to the island’s peak, but it is blocked by three locked gates. Each one requires keys from the three great oni that serve as the gatekeepers. They command the lesser oni, and each hired a guard. The group then gets worried Kintoki hasn’t returned yet. Suddenly Romani and Kotarou detect something approaching, so the group hide and observe. They see higher-ranked oni leaving the camp. Given their ability to speak, Mash wonders if they can get information from them when Ushiwakamaru runs off towards them. However, the group spots a female Servant killing the oni and goes to help her. After the oni are slain, the Servant leaves with the hope they’ll cross paths again. Kintoki then returns and reports he found something akin to a human settlement, so the group head there to get information.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 2: Attack on Onigashima
The group arrives at the first gate and defeats Sasaki Kojirou and the great oni Kazakoemaru.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 3: The First Great Oni Appears Afterward, they unlock and pass through the gate.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 4: Kazakoemarou Repelled
Arriving in the oni’s human slave settlement, the group encounter Musashibou Benkei, who tells them there is another settlement higher up. He was actually looking for the group when he ended up in the village. The group then leaves the village with Benkei.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 5: Of Oni and Men
Eventually, the group encounters a checkpoint. Seeing the path is too narrow and steep to go around the checkpoint, the group decides to break through. Disguising himself as an oni, Kotarou takes the others as human slaves. He tells the oni guard they were requested by the great oni. The oni doubts Ushiwakamaru can do any work based on her small frame and shameless outfit. Benkei tells him she is a seductress and knocks her out to "eliminate" her as a threat to the oni. He then drags her unconscious body past the confused oni guard. Once inside the checkpoint, Kotarou signals Kintoki, who sends the oni into disarray. The group slay the oni and get past the checkpoint.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 6: Master and Servant
Continuing on the pass, Benkei suggests they gather information at a teahouse in the settlement up ahead.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 7: Big Brother The group then arrive at the second gate where they encounter Tamamo-no-Mae and the great oni Wazahamimaru.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 8: The Second Great Oni Appears After defeating them, the group unlock and pass through the second gate.Fate/Grand Order - Onigashima: The Great Tale of DemonsDemons, Act 9: Wazahamimaru Repelled
At the settlement, the group finds Shuten and Ibaraki working at its teahouse. Shuten denies their involvement in the island’s construction, as they planned to destroy it out of anger at its construction. However, they held a banquet after drinking wine that tasted familiar when poured into an odd cup they found in the island’s treasure room. Shuten reveals the cup to be the same type of Grail from Rashomon, though less powerful. It isn’t strong enough to produce the alcoholic mist, but its effect will be felt when its wine is drunk. Shuten offers she and Ibaraki and the group join forces to find the mastermind behind Rashomon and Onigashima. However, the group fights the oni girls when Kintoki refuses the offer. Ushiwakamaru is left fatigued by her fight with Ibaraki, who unleashes her Noble Phantasm. However, Benkei uses his body to block it, and Ushiwakamaru disperses the flames with Kikenjō - Icicle Cutting after jumping from his shoulders. Struggling against the group, Ibaraki asks Shuten for the Grail to regain the power she had in Rashoumon. However, the Servant from before arrives, and Kintoki reveals she is Minamoto-no-Raikou. After forcing Shuten and Ibaraki to retreat, Raikou chases after them while the group continues their journey up the mountain.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 10: Of Alcohol and Oni
Arriving at the third, final gate, the group encounter Kiyohime and the great oni Gorikimaru.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 11: The Third Great Oni Appears After defeating them, the group unlock and pass through the final gate.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 12: Gorikimaru Repelled! 
At the summit, they find Raikou standing before the Grail. Kintoki warns the others about getting closer, as he recognizes she isn’t Raikou. He reveals her to be Ushi Gozen, Raikou’s oni self that she sealed away. Ushi reveals she acquired the Grail and constructed Onigashima using the Authority inherited from Gozu Tennou to create a kingdom for oni. Raikou constructed the island out of a bizarre kindness for those scorned by human society due to their strange appearance. However, she slew the oni out of hatred despite them being her workforce. Ushi reveals she created the oni by drawing them, and they’ll be destroyed once the island is complete. Revealing she mortally wounded Shuten and slew Ibaraki a moment ago, Ushi tries to convince Kintoki to join her as she constructed the island for him. She also reveals that she created the Rashoumon incident to make everyone kill each other by getting them intoxicated with the Grail’s wine. Kintoki refuses to join her and fights her with the others.Fate/Grand Order - Onigashima: The Great Tale of Demons, Act 13: And What of Momotarou 
As the group struggle against her, Ushi prepares to finish them off when Shuten ambushes her only to be slain by her. Kintoki uses the opening Shuten created and defeats Ushi with Golden Spark. However, he noticed she jumped into the lightning to knock herself out. He reveals Ushi manifested when Raikou built up too much Divine Energy inside herself. Raikou then wakes up, having no recollection of being Ushi. Despite that though, she recognizes the incident as her fault and apologizes for her behavior. She and Kotarou then disappear due to their oni heritage.Fate/Grand Order - Onigashima: The Great Tale of Demons, Final Act: Ushi Gozen's True Form
Later, however, Raikou returns, having used sheer will before she completely returned to the Throne because she forgot something. She tells the group that the three great oni become stronger the more they're defeated. They're reviving at this moment, and Raikou warns they may try to leave the island. While they'll disappear once Onigashima does, the great oni will cause great harm if left unchecked. She, therefore, challenges the group to slay the great oni until Onigashima vanishes.Fate/Grand Order - Onigashima: The Great Tale of Demons, Challenge: The Neverending Tale
==Participants==
Designation	Identity	Affiliation
Berserker 	 	Ritsuka Fujimaru
Berserker 	 	
Assassin 	 	
Rider 	 	Ritsuka Fujimaru
Assassin 	 	Ritsuka Fujimaru
Rider 	 	Ritsuka Fujimaru
Berserker 	 	None
Asssassin 	 	Onigashima
Lancer 	 	Ushiwakamaru
Caster 	 	Onigashima
Berserker 	 	Onigashima
==References==
Category:Locations in Fate/Grand Order
Category:Human Order Incineration
Category:Japan