Chaos find the Lysis system

The forces of chaos finally discovered the location of the necron device and the star chart to Lysis, after successfully deciphering ancient necron hieroglyphs on a system that had once been part of a galactic spanning empire. To find this vital information the Black Legion had to fight off the tau, whose scouting forces had by now reached the Hadron Deeps. Even worse, the Dark Angels continued to plague the Black Legion, and the Khornate warband the traitor astartes found at the site of the necron ruins were not willing to cooperate. 

With three opposing forces now contesting the ruins site, the Black Legion kept watch, until it became apparent that all forces were converging in the objective - the site of entry to the underground caverns. At first the chaos warband, a ragged crew of cultists and one astartes legionnaire, proved difficult for the Black Legion, but disciplined fire from the Sons of Horus eventually proved superior. Meanwhile the tau were driven off by the Dark Angels, who were themselves unable to reach the tomb site before the Black Legion. Having found the information they needed, the chaos force then withdrew from the dead world.