From the introduction: Warhammer 40,000. A galaxy where there is only war. Men, aliens, daemon and robots all battle for conquest, extermination and to serve their dark masters. It’s a dark, grim world to find yourself in and hope is rare to find. But as bad as it may seem, as hopeless as life may feel, a growing threat seeks to make it so much worse. The Great Devourer draws ever nearer to this galaxy that teems with life. The Tyranid swarm ever hungers.