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"Long ago, two races ruled over the earth: HUMANS and MONSTERS.
One day, war broke out between the two races.
The battle was long and hard, and the monsters were being overpowered.
Untilā¦ a monster finally struck a human down on the field.
With the power of a human soul, the creature became very powerful.
They were able to push back the humans to the mountains.
Beaten and weak, the humans sealed themselves underground with a magic spell.
Many years laterā¦"
Otherside is an Undertale AU written by Jetpack-Tuber about an alternate timeline where the monsters won the war with the help of a single human soul, and the humans sealed themselves underground in self defense. A child will become curious, however, in what lies above, and travels up to the surface. The rest of the story... is left up to them.
