Finally getting an outline for a fantasy/scifi world typed up and need advice on something about how I want cities to work when monsters (placeholder name, I'm not sure what to call them yet) are roaming around outside and are quite powerful and vicious. I might go for barriers, but I recently decided I didn't want sorcery to be the norm in the story, and I'm unsure how to make it a science based system. Perhaps city guards with access to decent weaponry? What do you guys think? Also, when it comes to the monsters outside the cities I want them to be more intimidating than say the kind in rpgs where they never enter towns anyways like...I guess Final Fantasy 7 (before later in the game when WEAPONs are wandering around) I'll use as an example, but not as terrifying as Attack on Titan where humanity feels helpless and doomed. So if FF7 is 1 and AoT is 10 on a scale then I want somewhere around 6. Humanity is limited in what they can do on their own planet and traveling can be risky depending on the type of transportation, but most people are ok until a specific incident in the plot happens and smaller monsters are getting past the guards and causing trouble in the cities.