The mysterious Adeptus Astartes chapter known as the Retributors prepare for boarding action.

Using a Caestus Assault Ram, the Retributors assault the rebellious PDF cruiser.

The Retributors board across the rebel vessel, encountering resistance aboard the cruiser.

The Retributors take the fight to the rebels deep in their own vessel, encountering heavy weapon teams and powerful psykers in the process.

The Retributors encounter the master of the vault, but discover him to be much powerful than they could imagine, forcing a difficult battle from the Astartes.