The Crawling Ones are a fictional race created by Chaosium in 1994 for the Call of Cthulhu RPG, which were based on H.P. Lovecraft's The Festival.
Thousands of maggots and worms make up a Crawling One. Each of the squirming creatures is individually alive and is constantly moving, though the general shape of a human is maintained. Because of the soft resilient quality of the body they create, normal weapons inflict the most minimum of damage.
Crawling ones are unable to speak but they are capable of writing message. They are all able to use magic and in close combat they use hand-held weapons as they are unable to make physical attacks.