Well, see's there's the other problem. There is no city. It's a flatish crater with Dissolutions everywhere. No cover, no safe spots, just a field full of those monsters. And Dissolutions aren't like your usual enemy AI; they're fairly unpredictable and don't react like usual mobs, making conventional tactics like abusing their AI difficult. You get one of their attention and it might alert it's allies, and now you're being chased by a group of them. Maybe it doesn't pay attention to you, thinking that you're just a silly player not worth the time. Or maybe it does just goes and attacks you, but other Dissolutions will see this and they will watch.