Resident Evil Wiki
Resident Evil Wiki
Prime universe
(Capcom's primary storyline)

Operation: Emperor's Mushroom was an operation conducted by the Umbrella Biohazard Countermeasure Service, under the direct supervision of Nikolai Zinoviev. It was conducted on the grounds of Raccoon University.[1]


The plan for the operation was for the UBCS team to enter and distract the experimental Tyrant model known as Thanatos, allowing Nikolai to obtain a sample of the creature's blood.

That part at least went as planned. The team engaged Thanatos in the university's Back Square and allowed Nikolai to plant an extractor on its back, draining an amount of its blood into a capsule.

At that point, though, things got out of control. Thanatos slaughtered the ground team and escaped before the blood sample could be retrieved.


The operation was a failure. The blood sample was taken by the survivors and used to synthesize the Daylight vaccine. Nikolai destroyed the main building of the university as ordered and all evidence of the mission was wiped out in the missile strike that consumed the city.


Emperor's Mushroom is the English name for Amanita caesarea, literally "Caesar's mushroom". The fungus was a notable delicacy among the ruling families of Rome. Agrippina the Younger most famously prepared a dish of Amanita caesarea with Amanita phalloides, a poisonous member of the same genus, to kill the emperor Claudius. Claudius's death assured the succession of Agrippina's son Nero (Tacitus, Annals, book XII).


  1. Resident Evil Outbreak (2003), file: "Orders".