Cinetochilum

A giant creature with countless yellow pits within its light brown body. It likes dark, moist areas, often living in caves and so forth. It is able to change its form freely, so they can fit themselves into any location it wishes. Because of this, people assuming that they won't encounter any large-size monsters in narrow caverns are often attacked without notice by cinetochilums. This proves that one should be prudent in keeping an eye open in search for escape routes.