Editing Zombie Plague (section)

===The Fydae Strain and the Vile Savants===
A polar opposite of The Zombie Plague created by Mortarion is the Fydae Strain, which is accompanied by the daemonic entities called the Vile Savants. It is literally a Daemonic virus, rumored to have been spawned when a hospital ship suffered a Gellar Field failure. Unlike the Typhus Zombie Plague the Fydae Strain doesn't need an infection vector based in the material realm. They simply home in on the bitterness, despair, and hopelessness being felt by a potential victim. The victim is nearly always a latent [[psyker]], but if the barriers are thin enough any poor sod will do.

Once the disease hits the Daemonic plague will infect Patient Zero and cause an intense fever filled with nightmarish visions that lasts one hour. After that, Zero does not suffer from any further effects, and in fact will be perfectly healthy for the rest of his life. As Zero returns to work, he infects everyone around him with the disease completely unaware of what he's doing. This is in fact part of Nurgle's "beneficence", as Patient Zero will show no sign of his blessings but still [[Grimdark|be condemned to see everything he loves rot away in front of him]] - all the better to encourage his despair until he finally breaks down and accepts Nurgle into what's left of his soul.

The most dangerous thing about the Fydae Strain is that the disease is sentient. It knows what it's doing, observes it's surroundings, and reacts accordingly. It can choose to act dormant, vary incubation and periods of illness, and even speed up or slow down reanimation depending on whether or not it thinks it's in danger of discovery. This means that areas previously thought to be safe can suddenly blossom with plague victims and undead in a matter of minutes as the daemon-virus seeks to cause as much damage as it can before it's eradicated. Basically it's the human player from Plague Inc, except that there is no Madagascar or Greenland in space so humanity is screwed.

As the Fydae Strain is daemonic in nature they do not spread just through physical contact, but can jump from mind to mind as well. This is a very effective and terrifying way to bypass physical obstacles such as walls, and often allows the disease to strike outside of quarantine zones. Another unfortunate fact of the daemonic disease is its extreme resilience to physical cures and methods, although it does mean the disease is weak against true faith and exorcisms.

Once the disease reaches critical mass and the undead swell into the millions, the Vile Savants manifest themselves in realspace. Taking the form of the hazmat suits they once wore as humans, now filled with flesh long since liquefied from decay and commanding the zombies to wipe out the living, they walk through quarantine zones to harvest the psychic anguish of their victims and sample any new contagions the outbreak may have spawned. Once their harvest is done, the Vile Savants return to the warp, letting the undead rot away in a matter of days and the remnants of the disease die out on it's own. There may be survivors, but the Vile Savants don't bother with them. After all, Nurgle does need witnesses to his generosity.