Karkassa is the 4th boss Krawl fought in Spectrobes. It appears in Nessa's ruins along with its helpers named Klutch and Klench. It tries to stop you from placing the keystones. Its property is unknown, but is likely Flash, as Aurora attacks deal more damage to it. Karkassa attacks by pummeling you with the gigantic pillar on his arm which will stretch across the field. It is capable of dealing a lot of damage very quickly, and its partners have the ability to heal, so it is recommended you defeat it as quickly as possible.
Karkassa HD

Karkassa from Spectrobes