It is a fictional world. I never named this one, so I haven't gotten that yet.

Demons can vary in shape and size. There is tons of flexibility to this. A lot of the smaller ones tend to run on all fours (as in the intro). But there also massive juggernauts of creatures.

Think more old western style for weapons. The rest of the tech would be more on the modern end of things.

Magic is generally used to augment things. There will be some more with this story wise. Small scope fire conjuring, using wind to knock people back, etc.