Vermis mysteriis

Vermis mysteriis was the genus of a demon that lived in San Francisco sewers and killed humans.

Characteristics
This species of Vermis mysteriis resembled a large lamprey with arms, due to its teeth, mouth, and elongated form. This demon didn't have blood, just slime, and got "a hide like a tank," impenetrable by the Scythe. The way to kill it was through his mouth and reaching his brain.

Appearances

 * The Spread of Their Evil