Clockwork Sentinel
Clockwork Sentinels are a type of machine living in the region around Synthayon in the Machinus Universe.
Design
Clockwork Sentinels are large constructs, up to 800 miles across. They bear enormous spikes on the edges of their thin, circular body, up to 800 miles long in turn.
On these spikes are enormously powerful generators. It is speculated that they are weapons.
On their underside is a powerful gravitic siphon, which takes in the 'tributes' from those wanting to use Synthayon.
Their entire body is based on clockwork, which acts as a nervous system, muscles, generators, and all sensor arrays.
Intelligence
Though Sentinels are most usually docile, they have been seen moving and intercepting in a way that shows forethought and imagination. They are probably sapient.
They only live to guard and maintain the Synthayon.