The Legend

A long time ago, Humans and Monsters lived in harmony, Monsters were just a normal part of life then, Humans and Monsters depended on eachother, Monsters were strong willed and hard headed back then, which made them perfect for defending their homes, Monsters were almost just like us, they had families, friends, and relationships, They had ambassadors and caretakers, Wizards and Knights, some were teachers, some were waiters, some were wealthy, and some were poor, after some time, things changed, people started to fear monsters all because they were different, they started treating the monsters like pets and slaves, so despite their protest, they decided to fight back, thus starting the Human-Monster war.

Humans, after a long battle, won the war, and with a team of Wizards, sealed Asgore (Who gained the title "Monster King" during the war) and the Monsters underground with a magic spell. This filled monsters with spite and hatred for humans, they were consumed by distain for humans, although they still loved what humans had created, they knew what humans were capable of and that action was needed, so Asgore and Toriel took action, assembling the royal guard, they gave the underground order and tranquility for a couple of years.

A few years later a human fell down into the ruins, Injured by it's fall it called out for help. Asriel, the kings son, heard the call, and brought the human back to the castle, over time Asriel and the Human became like siblings, and the king and queen treated the Human Child as their own. and lived a normal life among the monsters, most monsters didn't like this idea, but what could they do? The human was under the Royal Gaurds protection, Corrupt with power the guards did whatever they wanted, took what they wanted and without any consequence, killing those who overstepped their bounderies in secret, no one found out about this.

One day, the human became very ill, the human only had one request, and that was to see the flowers from their village, but there was nothing anyone could do, the next day, Asriel filled with grief, absorbed the Human's Soul and transformed into a very powerful being, with the soul, Asriel crossed the barrier and carried the Human's body into the sunset back to the Human village, when he reached the village, he found a bed of golden flowers, setting the human onto it, suddenly screams rang out, the humans were certain Asriel had killed the Child, and so they attacked him, he was struck with blow after blow. He had the power to kill them all, but he couldn't bring himself to do so. Wounded, Asriel stumbled back home, while entering the castle, he collapsed, his dust spread across the garden. The kingdom fell into misery, the King and Queen had lost everything, the Royal Guards were more on edge and strict than ever before.

Asgore had decided that every human that had fallen down into the underground, shall die for the greater good from then on, even Toriel agreed at first, but as the next human fell down, she couldn't bring herself to do what was neccisary, she eventually left Asgore and decided to live on in the Ruins, guiding every Human that would fall down next about the harsh environment and challenges to come, one by one they all sought to leave the ruins, every Human that left the ruins would end up dead, this took a harsh toll on Toriels mental health, meanwhile with each kill Asgore claimed, more power and addrenaline rushed to his head, the Royal Guards were shaped into Human Fighting weapons, and if someone had a problem with how things were, they were publicly executed. Asgore himself sought to get stronger and stronger, even pushing the old Royal Scientist to his limit to achieve his goals. Living quality got worse and worse for the monsters, they were forced to fall in line or get put in line by people who were better than they were. Only the elite of the Royal Guard were treated with respect and care, while the town folk had to bend their knees to obtain an ounce of respect from the rest of the monster population.

Eventually an 8th human fell down, this is where your story begins..

This time, there's no mercy for you here.

UNDERTALE: MONSTERS CORRUPTION.