the heat produced by high voltage electricity. vulnerability to chemical and biological attacks - for example, Iron Man created a cure to a virus-like bio-weapon based on the Venom symbiote that was created by Doctor Doom. Venom and Carnage have shown susceptibility to chemical inhibitors. Whether a symbiote can mutate and reduce the effect of these weaknesses is unknown. potential hosts with advanced healing factors, such as Wolverine, have shown resistance to symbiosis. in some incarnations, the symbiote is depicted as requiring a certain chemical (most likely phenethylamine) to stay sane and healthy, which has been said to be found abundantly in two sources: chocolate and human brain tissue. Thus, the host is forced to either consume large amounts of chocolate or become a cannibal who devours the brains of those they kill. This peculiar trait has only been witnessed in the Venom symbiote. However, both Carnage and Toxin have threatened their enemies with aspirations to "eat their brains", as well as various other body parts. When Toxin teamed up with Spider-Man and Black Cat, he struggled to keep himself together, but told Spider-Man that he was only "joking" about eating the robbers' brains. Similarly, the Exolons feed on the immortal soul of the hosts, making the hosts immortal; however, this causes the host to descend into madness, as well making them forget all of their old memories unless they inflict pain to themselves in an attempt to keep their memories for longer (see Zak-Del and the Nameless) on at least one occasion, Spider-Man was able to exhaust the Venom symbiote by taking advantage of the fact that it made its webbing out of itself; after the symbiote had already used a great deal of webbing to bind him to a bell, Spider-Man forced Venom to use further webbing so that it would exhaust itself, like blood dripping from a wound (although the sheer amount of webbing that the symbiotes would need to use for this weakness to be exploited makes its use in a fight limited). inability to bond to more than one host, as shown when Venom tried to bond to both Eddie and Peter at the same time and again with Flash and Eddie (although the Carnage symbiote did not display this weakness when bonding itself to people in Doverton, Colorado) susceptibility to feelings - in the storyline Planet of the Symbiotes, Eddie Brock releases a cry