Fallen Down

'...Dark...
I don't remember much of what happened, my memories are all blurry...
All I do remember is it being...
Dark...
Darker...
Yet Darker...
...
A light...'
"~~~~..."
'A voice...'
"-mity?" ...
"AMITY!"
"-Huh?" The green hair witch opened her eyes to see her friend looking at her with an annoyed expression.
"You fell asleep, again" This wasn't the first time she'd fell asleep out of nowhere. "Was the story that boring you'd rather sleep?"
"Willow..." She indeed fell asleep, but it wasn't because of the story, it was... something else... "I-"
"Ok, ok now it's time for me to tell a story!" said the raven-haired witch
"Oh, please Lily, what story could you possibly tell that would not make the kid fall asleep again?" said the witch with long grey hair sitting beside her "This time she won't be the only one falling asleep, I may as well due to your, hem," she thought for a moment "talent, to tell boring stories"
"You say that like you're any better than me telling stories." the raven-haired witch said offended.
"Wanna bet?" the other said with a smirk
"ugh, just, go ahead Edalyn"
"Ok then, prepare for a story full of action, drama, and stuff that definitely won't let you sleep for nights!"
"Edalyn!"
She ignored her sister

"A long time ago, humans and monsters lived together in harmony
Until one day, a war broke between them and the humans came out victorious
They sealed the monsters underground so that they could keep the surface for themselves
Legends say of a human who'll come to break the barrier
and let the monsters live in harmony with the humans again, but, until then,
they were sealed asking themselves, when will this "human" come?" ...

Or

The Owl House, Undertale Au, It's just an idea tho.