Fumes in a deep Chasm
Fumes are an environmental hazard rarely encountered in the game.
Dangerous Fumes are hardly ever encountered in the game and only occur in deep Chasms. If one of the heroes manages to get deep into a Chasm, occasionally the Chasm will have extreme heat or poisonous Fumes which will always prove to be fatal.
The only defence against Fumes is to never go anywhere near them. Zoya the Thief should always be careful when using her Grapple Hook to lower herself into a Chasm.
For a list of other environmental hazards in the game see: Hazards