Gears of War

From the introduction: Welcome to a problematic world where everything’s gone to hell in a handbasket! I'm sure you're used to that by now, so how about a good old-fashioned war of survival against an inhuman force pushing humanity to extinction? A battle of resources, of land, and the right to see who lives on this planet when the dust finally settles. The species that’s the most determined will naturally win, and the losers will be lucky if they make a footnote in the history of Sera. What? No, I didn't mean Earth. I really mean Sera. You're on a whole new world...