So I am thinking of world building something kinda sci-fi where Humanity has more or less fallen to a Menace of unknown origin. It can either have originated in Europe or America and whatever country that is on the opposite side of the world is more or less the only one thats not completely fallen. Both sides will have pockets of humanity being hunted by this threat. Aliens...demons?! What are they!?! Well if this has caught your interest lets give it a go. I have a story kind of in mind already but its very sand boxish since obviously two humans will be hard pressed to stop something that wiped out all of the world's military. Might just be surviving or it could go to more.

With all that out of the way I would like high casual, to low advanced writing. I kind of have in mind all the creatures but will always be willing to add more.