From the far edge of the universe comes the great devourer.  Like a massive beast, consuming all in its path.  Untold billions of planets are stripped of all life as the Tyranid race moves past.  Only the greatest force of arms can hold off the swarms and in the end all are consumed.  And now they have entered a new galaxy, one rich in natural resources and weak creatures to consume.  It is the galaxy that human kind calls home, the galaxy where the Imperium believes that it rules supreme.  Now, the pitiful races of this galaxy must make a final, desperate stand against the most powerful creatures in the universe.  And it is only a matter of time before the weak Space Marines, Imperial Guard, Eldar, Squat, and Ork armies are utterly annihilated, and the galaxy is stripped of all life.  Only the vast forces of Chaos have the power to challenge the swarms, but only a small portion of the armies of chaos are capable of leaving the warp.
 
       This is an unofficial codex for the greatest race in the Warhammer 40,000, the Tyranid Swarm.   It contains a complex history of the Tyranid Race, new facts about their bodies, minds, and society.  It contains lots of new rules for both the 40k and Epic game systems, and the most complex bestiary to date of the many creatures that comprise the swarm.  New explanations and tactics are presented for existing creatures, and complete descriptions for dozens of new creatures wait within.