Vileshroud

The Vileshroud is a strange and elusive creature that floats through the air like a poisonous cloud. Its body is comprised of a toxic and malodorous gas that is known to cause sickness and hallucinations in those who breathe it in. The Vileshroud is often found in contaminated or otherwise polluted areas, where it feeds on the noxious fumes and chemicals that linger in the air. The Vileshroud is a formidable foe and should be approached with caution. Its tendrils are said to be able to wrap around creatures and strangle them, while its poisonous gases can cause serious harm or even death. The Vileshroud is a rare sight, but when it does appear, it is a harbinger of danger and despair.

Once it's tendrils lock around your head, it looks like a hood made of toxic gas.