Disclaimer: I do not own Brave Little Toaster, Undertale, or most of the characters in this story. Characters from authors Lostinawhisper and Lampi01 appear, but they will be credited as they appear at the end of chapters to avoid spoilers.
In this AU, all of the human characters are around 12 years old.
Chapter One: Once Upon a Time
Far away in a far off land, and many years ago, humans and appliances lived together in peace. They existed in their own separate worlds. But one day, the humans discovered that their tools had been alive all along.
Appliances tried to make peace with their Masters, but humans feared for their lives. Some loathed the idea of common houseware stalking their every move. Others believed the appliances were possessed and held more sinister motives.
As is the tradition with such fickle beings, humans decided they could not live amongst these 'creatures.' Strife broke out between the two races.
It was not until the intervening of a fairy that the conflict was settled. She was begged, and eventually forced, into putting a stop to the madness.
Under her guidance, all of the appliances found to be alive were gathered together and thrown into a pit below Mount Hyperion. She sealed the appliances underground with a magic spell.
Still, this fairy understood they were innocent. She also understood how much it hurt to be trapped by the humans, so she included an extra clause to make sure that if peace could ever be reached, the appliances would not be locked away forever.
If a human and an appliance were to work together and combine into one being, they could cross the barrier, and the power of seven human souls would break it entirely. She hoped that the two races would be able to find peace.
She also made it so humans would be trapped behind the barrier as well. This was to make sure appliances would not be the only ones to suffer, and that humans would pay for their inability to accept other beings, somehow, in some form. A strange form of revenge, she decided.
Warnings were set in place to deter future humans from entering the cave. They are designed to last thousands of years. Even if the language they are written in does not. This has not stopped some curious explorers, however.
…
Legends say that those who climb Mount Hyperion never return, even to this day.
…
One day, two young friends were taking in the view from the top of the mountain. The wind was strong, so they flew kites and watched leaves dance through the wind.
When a lone monarch appeared, the more excitable girl chased after it. She ignored the signs posted around the barrier, which she could fall into at any second.
Her friend chased after her, but by the time they met up, it was too late. Both were close to the edge, the grass and dirt not enough to support their weight.
They fell through the barrier, never expected to be seen again.