Brother Arcturus, a battle-hardened Space Marine of the Cadian Shock Troops, had been dispatched to Molech as part of a scouting party. His squad had been tasked with investigating strange energy signatures emanating from the planet's long-abandoned underhive. The rumors spoke of an ancient xenos artifact hidden deep within the hive's tunnels, one that could potentially tip the balance of power in the Imperium's favor.
The Mark of the Xenos faded, and Kalthok-IV began the long process of healing. The survivors, forever changed by their experience, knew that in the vast expanse of the 41st millennium, there were threats beyond comprehension, and that vigilance was the Imperium's only shield against the darkness. Warhammer 40K - Mark Of The Xenos.pdf