A fully-grown Malacoda appears as a long worm covered in tumorous growths. It has a circular maw ringed with long, thin teeth. The maw is accented by two large mandibles that hang off the head. It lacks eyes, with only smooth plates covering the top of its head. Its tail ends in another orifice ringed with similar looking teeth. It can extend to great lengths, and proved powerful enough to crush a helicopter without noticeable recoil damage.