Monstrosities

Don’t be silly! There are no non-humans living in Eversink. Fabled creatures such as the Rattakan, the fungal Drowned, or the snake-like Serpentine were created in the Age of Monsters and died out long before mankind ever came into its own. They’re tales told to scare children and the gullible. Your home’s deep basements are safe. Perfectly safe. What a ridiculous idea. Forget you ever had it. It’s easiest to forget when you lock and board over the door to the basement stairs. 
You may not want to venture too far out into the bogs, though. Who knows what lives out there? There are rumors of toad-people, of dead things beneath the water, and of lost and confused small gods. 
And really, people would notice if monstrosities lived right alongside (or beneath) humans in Eversink. You can’t hide whole societies of predators who keep their own markets, their own politics, and their own secret sources of power. The Inquisition would announce a purge and would wipe them out. Unless the Inquisition was willfully turning a blind eye, that is. And what’s the chance of that?

That which goes bump in the night.