The Carrier is a singular instance of a parasitic, sentient growth that has taken hold of a metallic submarine cargo vessel. Only one of these creatures had so far been encountered.
The Carrier's exact appearance is unknown, as it is only ever found with a submarine shell over its body.
Being a relative to the Velonaceps Calyx (presumably), the Carrier takes control of much larger organisms, preferably ones that had already died. The one that was found had taken control of an old abandoned submarine known as a Nibbler - a type of cargo vessel. The outer "body" is covered in green algae and stained blood, with tentacle like growth resembling Fractal Guardians protruding where the propellers would normally be as form of locomotion.
One of the calls it makes eerily resembles that of a vessel alarm.