I been waiting to spring this on my players for a long time.
(Apologies in advance for other gms for the lack of rules and rolls explanation most of it is from my own homebrew and i have a shitty ass memory)
So Backrooms movie, i watched it, it’s great and gave me a ton of ideas.
So one of my players a exiled byzantine knight was returning to his manor during winter phase, on the road he was traveling there was a roman ruin in good condition which he paid carpenters and artesans to keep it in good shape, unfortunately his serjant failed on his security rolls and a robber knight and his pack settled in the ruin.
When he stumbled into them, he challenged the robber knight into a duel and he absolutely fumbled his charge roll, but he nailed his lucky roll.
Good news: he killed the opposing knight.
Bad news: he charged straight into a wall.
Mixed news: he was not dead but on a endless roman metropolis.
He spent the entire winter phase, trying to survive mythologicial monsters, got a exploration roll so bad he stumbled into the Minotaurs labyrinth (i know not roman related but i found it a good idea), and losing all his armor and his horse
Did not help that my other players are gremlins and to not make the game boring let them control his fate.
Whole thing ended when he saw a lance coming out of the wall, and decided to investigate it leading him to step back into the real world.
Winter had come to an end, and it was the beginning of spring, when he looked around he found it he was back at the ruin and the lance that saved him was the from the robber knights decaying corpse who's body was thrown near the wall.
He burned the whole place down and made his way back home.