This is an Undertale Multiverse/Underverse/etc thingy, focusing on one of my favorite OC's, Slate.
(if you know me already you mightve seen him/read about him before.)
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In the dark eerie structure known as Nightmares castle, starting at a horribly young age to be dealing with said goopy skeleton, Slate was raised with the idea that he NEEDED to obey Nightmares every word and feel immense guilt when he failed him, despite Horrors best efforts to tamper with this "training" Nightmare harshly forced onto his son, Slate still ended up completely loyal to Nightmare like some kind of dog.
But the intrusions of other influences made him start to question if he has been laying himself in a pile of thorny black roses, when a fresh patch of soft, fragrant, colorful, and frankly unknown flowers were just on the other side of the bush.
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Slate is a shipchild of Horror Sans and Wyvern Sans (another OC), well- one of them, he has 2 other siblings, Krysta and Obelisk.
Krysta is his twin sister (non identical), and Obelisk is their younger sibling.
all 3 reside in the same place, but all 3 were also exposed to different things growing up, because Nightmare wanted to experiment, incase something like them ever were to happen again.
this story is mostly for my own entertainment but im posting it publicly because it just feels better doing that instead of just writing it somewhere only i can read it at.