As a result of being administered the t-Abyss virus, the Farfarello came to be resistant to cold temperatures as evidenced by them operating on a snowy mountain top in conditions that would have frozen other models of hunters like the R. The Farfarello also came to have the ability to mimic their surroundings and become transparent similar to a group of aquatic organisms. However, because they were exposed to multiple viruses (both the t-Virus and t-Abyss), they became so aggressive that they were even more difficult to control than a regular Hunter.[excerpt 1]
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excerpt
↑From the Resident Evil.net Creature info page: Farfarello are created by improving Hunters with the administration of the t-Abyss virus, which enables them to turn invisible and blend into the surrounding environment, an ability usually found only in a number of aquatic organisms. The presence of multiple viruses has also increased their aggression however, and they are less controllable as a result.
