Originally Posted by Vaelastraz
So the the ability to resurrect every time he dies is an ability unrelated to the force? Because if it is related to the Dark side, it would not work, once all force is drained from Sion.
Nihilus could probably have done that by leaving Sion dead to the force. But it seems he chose not to, and so Sion could resurrect. Don't forget that the medical crews of the Harbinger were certain that he was quite dead until he decided to resurrect.