Demons
There will be demons, I think? Are they roaming the land as they wish or have they to be summoned to enter the material world? Are there rifts that demonic entities could use to come to the FL without help? Is there a hell or abyss where they come from? And does such a place exists in the religion of FL?
Erik‘s answer
There will definitely be demons. They may be summoned, but as there was a significant leak historically, they are also roaming the land beyond control. My definition of a demon is basically ”something that shouldn't be here according to godly plans”, so you should think wider than strange creatures with extra limbs and nasty claws. For instance, I consider ”The Blood Mist” that recently lifted, making travel again possible, a demon