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.