Basically a war with monsters, wild and human, against human beings, species of all kind, are in a post apycolyptic world, all the buildings are destroyed, monsters roam here, human and monster factions are AI generated.

There are many guns I know, rifles, pistols, and etc, these characters can be generated in a variety of ways, their guns are also customized, but be aware, due to the years, some monsters humanoid now have weapons. It works like a online game.