Having gained control of much of the frontier world of Phyrro Zeta in the Rifts of Hecate, the forces of chaos didn't appear to be planning anything for the world out of the ordinary until late in 11.023M42 the psykers attached to the imperial forces began raising the alarm. It appeared the forces of chaos were planning a ritual to dedicate the planet to Slaanesh, which would not only increase the power of that chaos god within the pantheon, but also increase the threat from chaos in the region, by setting in motion the path towards a new daemonworld and possibly another warp rift akin to the cicatrix maledictum.

The Hammers of the Emperor mounted an immediate rapid response, making planetfall on 1011.023M42, and slowly pushed forward through the host of daemons that were desparate to protect the ritual. In the battle the daemonic alliance of Syll Lewdtongue and the daemon monarch Esske was seen in the sector for the first time, though the combined daemon(s) of Syll'Esske was banished in the fighting by the loyalist astartes.

The Hammers almost made it to the ritual in time, but the unexpected and timely intervention by the forces of tzeentch tipped the balance and allowed the world to be dedicated to Slaanesh. What motivated the Architect of Fate to intervene remained unknown. Perhaps the Changer of Ways was merely bored, but it seemed to imperial high command that there might be a growing alliance between the two great powers, at odds with the entropic plans of nurgle.