This edition is standalone, and featuring all released DLC to date.
The Harbinger of Torment campaign has 5 missions
2) Heart and Soul
3) In Control
5) Surgical Destruction
As the Space Hulk, the Harbinger of Torment, emerged from the warp it is discovered to be on a collision course with the planet Baal. Several attempts are made to change course, but all fail. A team of the Imperium's finest warriors is sent to the Harbinger of Torment to try and reverse the engines or stop them altogether. Failure is not an option.