The Geocrawler is the boss of the 56th Floor of Aincrad.
The Geocrawler is the only known boss that does not have a Boss Room or a dungeon. It is found in an open field at the end of the 56th Floor, guarding the stairs to the next floor.
The largest known boss revealed so far, it has the height of a one-story house and is many times longer, like a legged armored earthworm or serpent. It has large horns and very prominent armor on its shoulders, back, legs, and front.