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Asgore is born.
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Toriel is born.
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W̷̧͇̣͓̯͔̓́̏̓̔̒.̶̯̦̪̠̭͎̞̮̫̾̐́́͒̿̚͠͠ͅḎ̶̎̐̊͆͠.̸̡̧͖͎͖̥͙͕͊̿̈̾͝ ̸̪̟̳͕̑̽̀̃͂̐̊͗̚͘ͅG̵̟͉̜̘̗̪̞̠̰̽͐a̷͇̼͂s̴̢̺̦͗̍̿͠t̵̯̰̖͛̿̿͘e̴̠̥̮̺̒̂̾̄͗̈͜͝r̶͚͑̃̓̃̈͒͝͝͠ ̶̨̞̬̬̃̔̒̋́̌i̴̮͍͖̝̯͔͇͒͆͜ș̶̭̘͒̍̔͗̅̑̍̕ ̸̡̪̖̻̲̳̺̟́͆̽̅̃̚͝B̸̘͋̍̀̊̀̆̀͌̓̈́o̶̻͋̋̒̈̀͠r̷̔̅̋̔̈́͂͗́͜n̸̗͚̲͊̉͆̽̉̚
̵̧̢̯̪̗̹̏̓̐͂̄̀̀̆͐̚ -
After separating England from the Catholic Church, Henry VII declared war against monsterkind which would go on for 5 years.
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After France, The Holy Roman Empire, and Spain got involved in the Humans and Monsters War due to papal orders, 7 wizards (3 female, 4 male) from France, England, The HRE, and Spain all gather together at MT. Ebott where monsters had fled to seal them away with a magical barrier that could not be broken unless a monster had obtained 7 human souls, though you can pass through it if you have a human and monster soul.
Monsters would remain trapped underground for the next 486 years. -
Despite having no plans to kill any human children yet, a human girl aged 11 with the Patience soul trait falls into the underground and gets herself killed after engaging in a fight with a monster out of fear. The monster, in self-defense, kills the child reluctantly.
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Only 58 years after Patience had died, a child aged 14 with the Bravery soul trait forces his way to Snowdin before dying of hypothermia.
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A girl aged 13 with the integrity soul trait falls into the underground and drowns whilst trying to make her way through waterfall after peacefully sparing every monster who came her way.
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A young girl aged 12 with the perseverance trait falls into the underground in search of solving the mysteries and legends that circulated about the place. She dies of heatstroke after just barely reaching Hotland.
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Hakai is formed by a man named Hunter Smith.
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Nicole Eden is born in Amsterdam, Netherlands
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Taiyo Hayashi, a Japanese girl, is born in England to her Japanese immigrant parents in Birmingham, England.
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Future Ebott City Council Member Luna Alton is born in Turku, Finland.
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Sans is born in the Underground to W̸̧̜̤̼̟͙̰͐.̸̜̹͑̓̽͋̒̉̚͜Ḑ̷̡̻̩̗̱̲̙̮̅́.̸̧̧͙̦̱̝̜͔͓̅́͆̈̐͜ ̶͍͔̹͈̄ͅǴ̵̞͍͇̲͐̀͂͆ͅa̸̛͈̲͛̌͋̕s̴̖̤̝͙͓̟̳̻͇͛̆̄̀t̵̨͇͈̎ͅe̴̜̦͚͛͆̿̓͊̿̓̇̊̕r̷͓̩͕͉͓̻͖̳͉̬̄̌̾̈̇
̵̨̢͓̮̹̙̀̒̽̃͌̈́͘͜͝͝. -
Future Ebott City city council member Ophelia Powell is born in West Yorkshire, England.
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Mettaton is born (in his ghost form obviously).
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A girl aged 15 with the kindness soul trait falls into the underground by accident whilst playing with her friends and finds herself dying of heatstroke just like the last child to die before her.
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After Hunter Smith dies, his son Jonathan Smith takes over Hakai.
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Future city council leader of Ebott City Nieva Wright is born in Ebott City, England.
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Undyne is born.
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Rose and Rain Violet are born to Lily and Anthony Violet in Ebott City, England.
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Future Ebott City council member Ashlyn Bennett is born in Ebott City, England.
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Alphys is born.
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Younger sister to Nieva Wright and future Ebott City City Council member Charlotte is born in Ebott City, England.
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Skylar Gomez is born in Ebott City, England.
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Muffet is born.
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Chara is born in London, England.
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Kayla Fyordor is born in St.Petersburg, Russia.
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Orchid Ebony, Rose and Rain's cousin, is born in Ebott City, England.
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Alina Rohn is born to her Spanish immigrant parents in Ebott City, England.
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Asriel is born to Asgore and Toriel Dreemurr in the Ruins.
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Catherine Anderson is born in Paris, France.
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Papyrus is born to W̸̧̜̤̼̟͙̰͐.̸̜̹͑̓̽͋̒̉̚͜Ḑ̷̡̻̩̗̱̲̙̮̅́.̸̧̧͙̦̱̝̜͔͓̅́͆̈̐͜ ̶͍͔̹͈̄ͅǴ̵̞͍͇̲͐̀͂͆ͅa̸̛͈̲͛̌͋̕s̴̖̤̝͙͓̟̳̻͇͛̆̄̀t̵̨͇͈̎ͅe̴̜̦͚͛͆̿̓͊̿̓̇̊̕r̷͓̩͕͉͓̻͖̳͉̬̄̌̾̈̇
̵̨̢͓̮̹̙̀̒̽̃͌̈́͘͜͝͝. -
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Frisk is born to her German father and Belgian mother in Brussels, Belgium.
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Rain dies of suicide after jumping down Mt.Ebott. Her soul shatters after she dies and thus is not collected by Asgore and added into the collection of souls he has.
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W̷͈͌͑̿.̸͎͓̐̊͂̂̽̌̑̚̚̕D̵̢̙̯̱̦͍̈̎͆̒͐͘̚.̵͚͈̈́̋̀ ̷̢̪̗̦̞̪̠́̆̽̅́̂́́͘G̶̯̬̥̒ͅĀ̶̹̱̘̘͙͎͚̳̲͝S̸̡̨̰͓͓̬͚̘̥̤̈́̀͆̃̅̈́̕T̷̨̹̯͝E̵̬̗͇̠̐͊̃R̸͔͖̙̗̠̠͕̩̭̓̈́͑͘ ̵͂͑̂̏͜D̷͇͕̪͖̑̌͒͑̈́̊̎̄́͝I̵̲̰͚̬͚̭͓̳̲̣̎̓̀͝S̴̨̛̖͖̻̬̱̻̄̎̉̽̎̉̅̎͜͝Ą̶̙̳͇̻̈̆̎̕͠P̵̢̧̜̥͒̈́͑͘͝P̴̩̪̩̜̘͖̹̩̣͉̒̽͌̏́̒̋͐̾̚E̵͈̮̺͉̾̄̌͒̚͠͠A̵̧̢̩̜̋̈́͋̾̀͘ͅͅR̷̡̙̠͔͋͆̽̃̾̂͗S̴͙̘̼̰̹͇̬͌͐̔͋̆͋͋̊̒̿.
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Himari Hayashi-Smith, daughter of Taiyo and Jonathan, is born.
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Orchid, Skylar, Kayla, Catherine, and Alina Form A Band Called Star Aversion.
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Rose attempts suicide by jumping down Mt.Ebott but her wounds are treated by Toriel and she thus survives.
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Chara dies of buttercup poisoning whilst Asriel dies by human hands after crossing the barrier after absorbing Chara's soul to try and take them back to the patch of buttercups they loved back at their home only hours later.
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A boy aged 14 with the justice soul trait falls into the underground and dies by Asgore's hand.
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Frisk moves to Ebott City.
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Frisk falls into the Underground by accident.