The Undervale Hotel does not pretend to be anything other than what it is. It sits in the trees of Upstate New York like a wound the land has never properly closed, its old walls holding centuries of restless spirits, lingering curses, and the occasional ancient thing that should never have been allowed to remain. The living who stay there learn quickly that the usual rules of the world apply only when the hotel feels generous. Ghosts walk the halls as freely as the guests. Magic settles into the wallpaper. And deep beneath the foundations, forces older than language wait for the chance to wake.

Katherine Freeling runs the place with the exhausted determination of someone who has decided that haunted or not, the business still has to function. Her family has adapted in their own ways: some with curiosity, some with resignation, and some with the peculiar affection that only grows where the impossible has become routine. Among them lives Abaddon, an ancient demon trapped in a human form and reduced to the undignified role of bellboy. He has endured centuries of diminished power, unwanted company, and the slow, irritating discovery that he has begun to care about the people around him.

Most days pass in the strange rhythm the hotel has settled into: chores, arguments, supernatural interruptions, and the quiet understanding that nothing here is ever truly normal. But every so often, the front door opens, and something steps inside that doesn't fit any familiar category. Abaddon feels it first—a wrongness that presses against his demonic senses like a cold draft under a locked door. The others sense only a milder version of the same unease. They welcome the newcomer with the practiced courtesy of people who have learned to keep a haunted hotel running. Abaddon simply watches, silent and certain that this particular guest will not prove as ordinary as they first appear.

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I don't own any of the characters or settings. Credit goes to the original creators.

Also, this contains my own headcanons, ideas, and settings (ex. I have to age up the characters for obvious reasons).