Okay, off the top of my head this is what I know about warhammer 40K. [spoiler] Humanity is a theocracy whose God/emperor is on life support. Other species are the Eldar (space elves, they keep their souls in little stones to prevent slanesh from getting ahold of them) there is also another group of them known as the dark Eldar (extremely depraved Eldar.) Necrons: undead machines. the Tau (I don't know a whole lot about them, apparently their culture emphasizes the greater good or something.). The tyranids: bugs. Da orks (exactly what it sounds like, they reproduce asexually and generate small psychic fields that make whatever they believe become reality ex: red vehicles go faster because orks believe they go faster, also some have an innate understanding of mechanics and medicine.) Finally there are the Chaos gods, I heard they were a bastardization of the Norse gods but I have no idea which ones, except Odin for khorne. Nurgle: God of disease and pestilence. Khorne: God of war, blood, etc: pretty self explanatory. Slanesh: God of hedonism, created by the Eldar. Tzech?: God of plots, sorcery, etc.[/spoiler]