D-Rifter is an object. It has Lieutenant class hit points. It has no attacks and cannot move.
Unlike many others, this object had no defenders when I found it. There was a nearby group of Lost around, but those seemed to have been randomly placed and didn't seem interested in defending it. Once I started attacking, no one came to its help, either, and it was destroyed easily.
Oddly enough, the D-Rifter was spamming this effect:
This strange machine looks highly advanced.