Space Wolves - The Enemy Within: Upon the bridge of The Rock, the fate of the Space Wolves was debated at length. The Changeling, a shape-shifting daemon of Tzeentch, had impersonated a slain Dark Angels Scout in order to gain access to The Rock's Apothecarion. Once inside, he had stolen the form of the fortress' Vox Seneschal. Ships from a dozen Chapters stood ready to follow the orders of The Rock's masters. The judgement of the Space Wolves hung in the balance.The daemon wearing the skin of the Vox officer wove its webs of deceit. It claimed that not only was the Curse of the Wulfen irrevocable proof of malefic taint, but that the Great Wolf, Logan Grimnar, had been confirmed as dead, and that his Wolf Lords were either missing in action or at each other's throats, impotent in the face of the Chaos infection. The Dark Angels alone could restore order to the troubled Fenris System -- where the grievous influence of Chaos had taken hold, they must burn it clean. With a heavy heart the Supreme Grand Master of the Dark Angels considered the order for the bombardment of the Fenris System, and what it might portend. He gave it nonetheless.Though only the hidden architects of this unfolding tragedy fully appreciated it, the echoes of that which had occurred upon Prospero were profound indeed. The Space Wolves were to be punished for their genetic deviance and pursuit of hidden truths, much as they had brought the intolerant justice of the Emperor to Prospero in ancient days gone by. It was a delicious irony to the servants of Tzeentch, and Magnus the Red foremost amongst them.The daemonic entity that had infiltrated the bridge crew, known in the sagas of the Space Wolves as the Changeling, was in its element. It had sown confusion and angst throughout Chapter Serf and Space Marine alike. Posing as Vox Seneschal Mendaxis, the daemon had formally announced to the Dark Angels that the Space Wolves had used the stronghold of Longhowl to open fire on the fleet belonging to the newly arrived Grey Knights. This news, coming so soon after the pict-thief footage of Dark Angels Scouts being slain by the Wulfen, sealed the guilt of the Sons of Russ in the minds of their prosecutors. The Chapter was irrevocably tainted.One of the Fenris System's worlds, Midgardia, had already fallen to daemonic invasion. Azrael concluded there was no recourse but to scour it clean with the killing fires of Exterminatus, even though there were still Space Wolves upon its surface. The declaration was met with awed silence, but with Logan Grimnar missing, presumed dead, there were few with influence enough to gainsay him.To their horror, Grey Knights Brother-Captain Arvann Stern and the other warrior heroes that had approached The Rock to consult with Azrael in person found that they were too late. The bombardment cannons of the Imperial fleet had already opened fire upon the planets under their gunsights. Midgardia had been subjected to such a brutal and extensive firestorm its surface was little more than a worldwide conflagration. Morkai's Keep upon Frostheim had been blasted to rubble by a Lance strike levelled by the calculating Iron Hands Chapter. The Fenris System was besieged by both foes and allies, and the planets and moons where the daemonic incursions were most apparent were already suffering grievous wounds under the Crusade fleet's onslaught. The war that Stern and Ragnar had come to stop was already in progress, trusted brothers at one another's throats.Everywhere confusion reigned, inflamed by the wrath of the crusader and the defiance of the accused. On the vast hololith displays at the fore of the bridge, the dispositions of the Imperial fleet and the defensive citadels of the Space Wolves flickered and came into focus. The fate of the two rival Chapters hung in the balance, the voidships of their fellow Adeptus Astartes all but silent as a suffocating miasma of doubt and despair threatened to erase millennia of hard-won brotherhood.Upon the bridge, the parley between traveller and commander was swift and intense. When the echoes of harsh-tongued speeches had faded from The Rock's bridge, it was Stern who spoke alone. As a Brother-Captain of the legendary Grey Knights, his words carried gravitas indeed. He spoke of Chaos, and those who would spread it. He had already judged the souls of those Wulfen he had encountered, and those of the warriors who had fought alongside them. He had found them sound. However, there was one upon the bridge of The Rock who did not belong, who was more than a hidden agent of corruption. He was anarchy incarnate. Stern pointed an accusatory finger at Vox Seneschal Mendaxis, and named him for the daemon he truly was.With the Changeling eventually defeated in the bowels of The Rock after the battle that ensued, the Dark Angels realised they have been manipulated. They ordered a ceasefire and concentrated on the purge of all daemonic taint within their own fortress-monastery, before dispersing the Imperial fleet across the wider Fenris Sector to take war to those worlds that sent astropathic distress calls matching the signature of Tzeentchian invasion. The Great Companies of Bran Redmaw, Gunnar Red Moon, Bjorn Stormwolf and Engir Krakendoom, having made transition into Fenrisian space within solar days of one another, made haste to join their fellows upon Fenris. With the Daemon Engines known as Silver Towers entering the sector in great number, they were soon embroiled in a series of desperate wars.