One of the great mysteries of the gods is that, while we have numerous extraordinary architectural marvels left from their time, there is a complete absence of mechanical equipment commensurate with the construction works. These scarabs are attached to the Watcher’s backs. These store the boron doping agent, and the carbon and nitrogen harvesting units.
They used cubic phase polymetric nitrogen, an extremely strong and light, but volatile structure, and secured it in a CG-N lattice with a boron oxide doping agent. This simply collapses into dust if the doping agent deteriorates with time or when actively disengaged.