The Mustard Virus is a minor viral “zombie” disease in the known multiverse. Discovered in 1766 NE, it remained contained in its home universe for many centuries until resurfacing and escaping with the outbreak of the Infection War.
The Mustard Virus, while curable in early stages, is still considered a Class-2 virus by United Civilizations standards. After those infected are completely turned, they undergo an “evolution” of their physical form every ten standard Earth days, making them faster, stronger, and far more aggressive each time.