Calcruthl, also known as CrystSlugs, is an enemy in Final Fantasy V. It is found in the Ship Graveyard, usually paired with Skeletons. It is not a threat, as its only means of offense is an ordinary attack. The player can later obtain the Beastmaster Job, learn the Control ability, and control it to learn the Blue spell, Transfusion. They can drop valuable Elixirs.
Calcruthl from Final Fantasy V appears as an enemy in Pictlogica Final Fantasy.
The name may be a mistranslation of Carcohl. Carcolh is a creature from French folklore said to be half serpent and half mollusk.