According to The Lesser Key of Solomon, Decarabia (or Carabia) is a demon and a Great Marquis of Hell, or a King and Earl according to the original Latin version of the Pseudomonarchia Daemonum. He has thirty legions of demons under his command.
Decarabia knows the virtues of all herbs and precious stones, and can change into all birds and sing and fly like them before the conjurer.
He is depicted as appearing as a pentagram star, changing into a man under the conjurer's request.
An aquatic counterpart to Buer and Bael. Decarabias are initially found rolling slowly on an underwater surface, but once approached, they will propel themselves rolling forward at great speed in an attempt to inflict contact damage. They can sometimes be encountered in tight spaces, where attacking them could be risky, so using ranged attacks that can pass through walls is advised.
Decarabias reappear in Order of Ecclesia, this time taking the form of massive starfishes that are difficult to damage. They are only encountered in underwater areas of the Somnus Reef.
They move by spinning, one step at a time, on a point that's on a solid surface, such as crawling over walls or the ceiling. They are poisonous to the touch and notably resilient to most forms of physical attacks. They are susceptible to elemental damage, though, so the use of glyphs that can target and damage them from a safe distance, like Vol Fulgur, are recommended.