As the full scale of the Tyranid infestation on Valboris became apparent the planet's chaos overlords desperately sought for a way to stem the tide. With the majority of the traitor legions engaged in the defence of Bastien and the Catechism notable only by their absence the warlords were left with no choice but to treaty with the Gods of Chaos themselves for aid. Through week long rituals of blood and sacrifice and the promise of immortal souls the Dark Gods at last saw fit to gift their repulsive minions with the presence of their power made manifest.
As reality stretched thin a tear in the fabric of the material realm opened, vomiting a stream of gibbering daemons into the heart of the Tyranid swarm. Their target was a massive winged Tyrant who seemed to be directing the attack. The Tyranids, incapable of fear, responded with single minded purpose attacking the daemons head on. Despite succeeding in bringing down the Tyrant the cost to the forces of chaos was impossibly high and all the daemons were banished back into the warp, barely slowing the waves of Tyranids that washed over them. The warlords of Valboris would need to make further sacrifice to stand any chance of stemming the tide, and next time the price demanded by their capricious gods would be higher still.