Welcome to Librarium Online!
I am trying to sketch out some background infomation for my necron army.
I have noticed in the back of the codex their are 16 dead world featuring Nercontyr structures and we can assume two to three more counting Pavonis, Naogeddon, and Mars be the tomb worlds of three remaining C'tan.
Would a C'tan have more then one tomb world? If they do, why did not the Nightbringer then flee to one of this other tomb worlds when he was attacked during the final betrayal of the Deceiver?
Can a C'tan awaken the nercons of a fallen C'tan to enslave in to his armies?
I am pretty sure that the number of Tomb Worlds isn't restricted to the number of C'tan there are. So yes, there are multiple tomb worlds for each c'tan.
However, there werent multiple stasis sarcophogi for each C'tan. Since this was the place that the C'tan stored up energy for their millenia long hibernation it would be inneficient (with regards to storing up enough energy to survive) to create multiples of these stasis tombs.
So while each C'tan would control multiple Tomb Worlds, they did not have a stasis tomb in which they slept and stored energy on each tomb world.
This is just my take on the subject though. I never claim to be the end all be all of fluffery.
"I am the architect of fate!"