The Iluzija was a human-based B.O.W. encountered by Chris Redfield, Piers Nivans and several other BSAA operatives while dealing with the bioterror in Lanshiang, China, primarily in the Poisawan slums in Waiyip. Its name is derived from the Serbian word for "illusion".
The Iluzija was unleashed in Lanshiang during the bioterrorist attack by Neo Umbrella, killing numerous BSAA forces. The creature attacked Alpha Team and dragged off one its members, forcing the remaining members, led by Chris Redfield, to give chase. They pursued the beast to an apartment complex, where it began picking off the soldiers one by one, which greatly angered Chris who became determined to exterminate the B.O.W.
Alpha Team eventually cornered the Iluzija and manage to weaken it by attacking its vulnerable mouth. The creature fled into a flooded maze where it hardened its scales to protect itself. Unable to kill the beast with their weapons, Chris lured the monster into a pool of water and electrocuted it with power cables, finally eliminating it.