Nightbringer

the long version

"From the Black Library archive, the classic first novel in the bestselling Ultramarines series in a lavish new format. Newly promoted Ultramarines Captain Uriel Ventris is assigned to investigate Pavonis, an Imperial planet plagued by civil disorder and renegade eldar raiders. But nothing is as straightforward as it appears, and Uriel and his allies are forced into a deadly race against time to destroy their shadowy enemy - or the whole planet must be sacrificed for the good of humanity"--Provided by publisher