Homo Erectus Gas

The Homo Erectus gas is a deadly chemical that turns its host into a furry, It was released into the atmosphere after East Man's chemical plant blew up.

Lore
Homo Erectus was first discovered during the very first Tri-Pride festival, after one of the attendants had belched the stuff up. It has since then been safely contained at East Man's Chemical Plant.

Appearance
It makes a brief appearance in the end of book three, where it's covering the entire city. Our heroes are forced to take precaution and wear gas masks to avoid inhaling too much of this noxious gas,

Trivia

 * It's name, Homo Erectus, is actually a species of early human. (But evolution is fake, so we know that they never existed.)
 * It's name is also a play on two words; homo, meaning 'gay', and erectus, meaning...Well, you get the idea.
 * It is rainbow in color. This is a reference to the gay pride flag.