The Grey knight Prognosticars on Titan detected a potential warp rift in a sector on the south eastern fringes and two ten man strike squads of Grey Knights, Senior Techmarine Onox and Librarian Elban were dispatched to intervene with the strike cruiser ‘Intolerance’ The Knights arrived to the sector and found the central worlds being overrun by the defense force who had turned to the dark gods. Loyalist forces of Ultramarines, Black Templars and Dark angels were in battle trying to regain control but were hard pressed due to the limited amount of their own forces that were available.

The Grey Knights scanned the major worlds and detect a warp disturbance on the Agriworld of Couture The Techmarine remained on board and the Knights deployed to the planet’s surface they quickly came under attack by traitor guardsmen who had light tanks and a few demons in support, after surgical strikes to the enemy’s support lines and heavy weapon teams they pushed through to the disturbance to find a ritual of summoning, The rituals central point was an Ultramarines librarian chained up with chaotic runes etched over his body writhing in agony as a daemon attempted to take over his physical form.

A vicious fight ensued as the traitors tried to bide time for the summoning ritual to complete allowing a powerful daemon to take over the librarian’s form. By this point the Grey Knight force has suffered minor losses during the strike to the summoning ritual and they suffered more during the battle at the ritual, however they managed to kill the host before the daemon burst forth into the material realm with the Grey Knight librarian striking the host with his nemesis force halberd and over loading the weakened mind of the host.

As the traitor forces were dispersed the Grey Knights took stock of their forces to find that only 7 Knights had survived along with the Librarian, however they knew that there was far more to be done in the sector. They teleported back to the strike cruiser ‘Intolerance’ Here the Knights had found out that the main hive world was finally being overrun and that the loyalist marines had started to turn on each other. A single transport shuttle attempted to bolt from the hive world and was being followed by three attack craft which were gaining rapidly, the attack craft scored direct hits on the engines and shield generators on the transport craft leaving it a sitting duck in space.

The transport bore the heraldry of the planets governor general and the Elban knew that for this sector to continue there would need to be a governing force and decided to assist, they quickly destroying the three attack craft and the Grey Knights invited the governor general and his retinue onto their cruiser while they formulated a plan of attack.

To find out what had happened in the sector they questioned the general only to find he was less than helpful as most Politian’s are, however his retinue’s psychic was happy to advise how it was he who had detected a looming shadow heading towards their sector and it was he who had contacted any loyalist marines in the area for support. His support request was answered by a company of Ultramarines including vehicle support, 4 tactical squads from the Dark Angels and a half company of Black Templars with vehicle support. The Ultramarines arrived first and as they made planet fall pockets of insurrection started to pop up across the hive world, the local guard forces were deployed and as they arrived to engage they turned their guns on each other and those that were left alive joined the traitors.

Similar events started to happen across all the worlds in the sector and that’s when the marines were deployed. One of the major battles turned badly for the loyalist’s when two squads worth of marines from the Ultramarines engaged their own forces citing their brothers had turned over to chaos. They were quickly eliminated however more and more marines started to turn and now only the true of heart marines were left and they were starting to lose ground.

The Grey Knight’s realizing they were going to be hard pressed to fight an entire planets worth of heretic’s sent a psychic request back to Titan for them to send more units, the requested was answered by Brother Captain Stern who quickly sent as many Knights as he could including a Dread Knight and Venerable Dreadnaught. Stern advised he would be accompanying the force as the threat level for the sector had gone up with the information relayed to him.

Elban realized that the support force would be weeks away at best and contacted the last remaining loyalist marines who were on the planet offering support where it was needed. In the coming weeks another four Knights fell to fighting however with the loyalist marines in support they held major vital areas. With the help of senior Techmarine Onox battlefield repairs were made to broken vehicles and adjustments were made to increase the firepower of others. To separate the loyalist marines from the one who had turned the Grey Knights made the remaining marines to repaint their armour in their same grey of their own, in the heat of battle they were able to differentiate friend from foe at a quick glance.

The arrival of the support fleet from Titan was met with great relief however upon their arrival a great warp storm started engulfing the sector stopping all communication and travel to and from the sector.