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.
The most threatening ability of the Iluzija is its ability to blend in almost perfectly with its surroundings. It does this by secreting a liquid over its body that bends the light around it. While doing so, the snake is nearly impossible to see, with only a mild rippling haze visible when it moves.A flaw in this ability is that the inside of its mouth becoming completely visible when it opens to prepare for an attack.