"True, but as you well know, it doesn't always work. As for your question, the answer is simple :
Vampires are abominations." The Thrice-Damned's eyes flared with mad zeal as he spoke, and the fact he was hovering atop an altar gave the whole scene the appearance of a crazed prophet addressing a crowd of unbelievers. "I saw how our very undying existence is an affront to the natural order, and wept for us all. But Lord Nergal forgave me, despite my blasphemous nature.
"By making you an ugly affront to the natural order?"
"YES! I mean, no! These marks are glorious gifts!"
"Diseases being seen as gifts is decidedly unnatural. Any species that believed such foolish things would kill themselves off. If an undying existence is an affront to the natural order, then how is becoming an undying existence that reality itself attempts to reject an improvement? Were it not for the sacrifice of those just prior, your twisted mockery of life could not even show its face here it is so unnatural! You are the shadow of a shadow; twisted in the reflections of loss and fear caused by plagues as they echo across time. When your pale reflection is lost to time? Humanity will remain. Is it not natural that a species that has created a cure for even the most twisted of diseases to utterly crush a mere echo of the fear of plagues?
"Are you done?"
"No, I'm not done! Jurgen! Fetch my chair and my treatise on philosophy! We have an echo to educate."
And thus did Cain stumble upon the true weakness of chaos... someone willing to point out their nonsense and stubborn enough to not stop. In the future, all warp anomalies would be safely and swiftly handled by sending an old irritable philosopher to talk the ghosts back into their grave. While the stronger ghosts would occasionally lash out or set up some trap to try and prevent this, none of them could fully resist the urge to monologue and get into morality debates with their opponents. Great amounts of their energy could be tied up and expended by just talking to them at length. The resulting Chaos God of "old irritable philosophers" that would take the place of the other four would later be handled by sending someone with some calming tea and an agreeing temperament to relax the spirit into a nap.