The T'au Empire are a fledgling race in the grand scheme of things, thrusting out into the stars to spread their philosophy of the Greater Good to all they can reach.
The Space Wolves are a savage Space Marine Chapter of merciless hunters. They hail from the icy death world of Fenris and strive to emulate the strength, cunning and howling ferocity of their Primarch: Leman Russ, the Wolf King
The Orks love nothing more than charging headlong into the fury of combat, bellowing "Waaagh!" at the top of their lungs and letting loose with whatever weapons they can lay their hands on.
The Drukhari are a decadent race of alien tormentors and raiders. Once part of a galaxy-spanning empire, the Drukhari now indulge in every macabre passion their supreme intelligence can conceive.
The Deathwatch are a widespread Chapter of Space Marines and the Imperium's greatest weapon against the manifold threats posed by countless xenos races.