Toxious, like its predecessor, is a shadowy being whose face is obscured in shadows. Toxious sports two large, glowing, white eyes. It also has an ovoid, metallic apparatus that resembles the mouthpiece of a gasmask. Toxious wears what resembles a large dark gray fedora. The metallic tube scarf around Toxious's neck has changed slightly. The circular appendage has now retracted towards the base of the scarf, and the scarf itself is connected to the breathing apparatus. Toxious wears what appears to be a dark gray cloak. Toxious now has two metallic, gray arms with hose-like appendages where its hands would be.
Toxious are able to release toxic gas from the hoses on its hands.. These gases can cause both Meta Monsters and humans to become physically ill. Due to its breathing apparatus, Toxious is immune to the gas of other Toxious.
Toxious are solitary creatures that prefer to keep to themselves. They have been known to spray toxic gases into humans' bedrooms while they sleep.
Toxious can be found in forests, although they can be seen in suburban areas.
It transforms from Malodor at Level .
"Toxious have been reported to spray toxic chemicals into the houses of humans while they sleep."
- Toxious is the eighteenth Meta Monster in the Encyclopedia.
Toxious is based on a cryptid known as the Mad Gasser, a shadowy being that was supposedly seen spraying toxic gases into peoples' bedrooms at night.
Toxious is a combination of toxic and noxious.