Avoid it or kill it with fire is the only real way I can think of.

They'd be very rare and generally you'd know where one is lurking because they leave grease all over the place.  So if things are greasy, you probably should consider going a different direction.  (And you'd hopefully hear one lurking in a slide, really though going done a enclosed slide in this realm in general is a gamble since you never know if there's savages lurking at the end of that slide.

As for inspirations this does seem like a realm where things people have irrational fears of should lurk more than things that people have rational reason to fear.  Like some balloon based monster or a creature that really likes to make clicking noises all the time and never stops following you. (and it's very hard to chase down and kill)

Lore wise I think the idea of any day and night or void should be dropped.  It should just be playplace all the way down, up or in any direction for that matter where any sense of time is lost.