The Iluzija was mutated as such to closely resembles a serpent in its body shape and mannerisms, though enormous in size. It was originally a human that was exposed to the C-Virus. It was easily able to fling an average-sized human male with great force. Instead of two primary fangs, the Iluzija seems to have a line of thick fangs along its jaw, that bend forward similar to a viper's as it opens its mouth. The Iluzija appeared to be blind due to the apparent lack of eyes, or at least partially blind, and as such resorted to use its heat-detecting sense to locate its prey.