I recently have started thinking about the question in topic, I think it was caused by theheretek in broken chains who fuses his flesh with that of deamons.
As lexicanum states:
- The Void Dragon may be based on Mars.
- The Void Dragon may be worshipped by some of the Adeptus Mechanicus as the Machine God.
- The Void Dragon may be feeding in order to return in strength.
- The Void Dragon controls and consumes victims slowly through the use of technological implants.
- The Void Dragon may be able to remotely control technology over vast distances.
So what would tech-priests do when it awakens? There are a few possibilities:
- accept the void dragon as the Machine God and turn necron.
- view it as a false god and stay with the empire of men
- does not compute......
Not there are hereteks and there things may get more interesting as some of them have gained mutations, use psychic powers and creates warp-tech, which would make them not acceptable for the C'tan. So how would they (if at all) react?