|Acid evaporation, Mushroom enemies, Gassy status effect|
Flammable Gas is a non-toxic, green gaseous Material emitted from Acid corrosion and from players with the Gassy Status Effect. It is extremely flammable and gathers in large pockets as it floats up into the ceiling.
As Acid is fairly prevalent throughout the game this gas can be found in most biomes, but sealed rooms filled with concentrated amounts of it can be found in the Fungal Caverns, usually near several pedestals with Flasks. For some reason, the gas found in these rooms will not flow out or move if the room is breached, but will act normally otherwise.