Cleansing of the Sin of Damnation - The Artefact: When the Blood Angels finally arrived, Sergeant Lorenzo and his warriors confirmed that they had indeed been subjected to some form of psychic attack by the Genestealers. The exact nature of the threat was indeterminate, but the need to rejoin the main attack was pressing. However, Brother Calistarius detected a strange presence less than a kilometre away, unconnected to the Genestealers. Not wishing to deprive Captain Raphael of all their warriors, Lorenzo and Gideon agreed to split, with the former accompanying the Librarian to investigate this new phenomenon while Gideon returned to the main force. Following the psychic trail, Calistarius and his companions discovered an ancient Blood Angels Battle Barge that had been lost in the Warp nearly nine thousand Terran years earlier. Chapter history attested that the Wrath of Baal had been carrying an important artefact of the Blood Angels from Terra shortly after the Siege of the Imperial Palace had ended. Lorenzo and Calistarius were determined to locate this treasure and retrieve it from the clutches of the Genestealers.Within the Chapel vault of the Wrath of Baal, the Space Marines discovered a golden grail, one of the famed Blood Chalices; an artefact of the times before the Horus Heresy. It was stained with the blood of their Primarch and psychic link with Sanguinius coursed through the Blood Angels' veins. Once recovered, the Blood Angels had to fight their way out of the chapel towards the bulk of the main force. Sergeant Lorenzo and Brother Goriel disappeared during the fighting, leaving the squad two warriors down and leaderless. Brother Calistarius took direct command. The main force had been battling hard to contain the Genestealers within the hull of the merchantman, though a few would inevitably escape the cordon. It was imperative that all squads were on hand for the final attack.Brother Calistarius led the remnants of Squads Lorenzo and Leonidas from the Wrath of Baal, back towards the main force of the 1st Company. They encountered scattered pockets of Genestealers and moved swiftly to rejoin their comrades. However, such was the treacherous nature of the Space Hulk's layout that the shortest route forced them to break through the corridors of a vessel whose emergency doors had closed. As the Space Marines cut their way through the bulkheads, enemy lifesigns closed in on their position. Though they were barely one hundred metres from the rest of the 1st Company, the Space Marines returning from the Wrath of Baal faced two formidable obstacles.The first was a winding network of corridors and rooms sealed by locked bulkheads. The second was a gathering number of Genestealers that had been attempting to circumvent the cordon set up around the pumping station. Although the artefact had been returned, the Space Marines were still isolated. With the main force unable to break out of their pocket to help Brother Calistarius and his warriors, the Space Marines were left to make their own way through the maze. Squad Gideon had not rejoined the main force, and their Sergeant despatched his warriors to find a path through to their isolated brethren. Having split up to find the most direct route, both squads were in a poor defensive position to respond when the Genestealers located them and began to close in for the kill.