The mysterious Eldar are all that remains of a once great and powerful civilization that ruled the galaxy. They travel the stars in enormous spacecraft called Craftworlds, seeking the Maiden Worlds their ancestors created in ancient times. One such world is now inhabited by humans and possesses historical records and artifacts of great power far too valuable to leave in their hands. This once proud race now fights for its very survival, and must protect the secrets and power of their ancestors from both the Imperium of Man and the evil, bio-engineered Tyranids, bent on the destruction of this fertile paradise.