Large hordes of karkinoi come together to hunt inhabitants of coastal settlements. Striking at night, they do as much damage as possible before dragging their meals into the sea. They make such attacks night after night until the settlement is destroyed or the resistance becomes too fierce, at which point the horde disbands and each karkinoi makes its own way in the sea. While karkinoi can walk on land, they do not enjoy long periods away from the sea, as they dry out, crack, and eventually suffocate.