During the non-civilization dimension reduction period, human beings would completely dissipate after death, their information merely falling into the conceptual entity of human civilization, hence there were no such things as spectres in a non-diminished state.
Although there were also some humans with unique constitutions who were different, for example, Lu Yuanming couldn't be certain about the outcome after Eligible Ones died, it was possible they could bypass the human civilization's interception and directly fall into the Dark Matter World, or they might still retain the imprint of their original life within human civilization.
Besides the Eligible Ones, like what he referred to as the "Exceptionals" in the narrative layer, it was estimated that there might be other special life forms existing aside from Eligible Ones and Exceptionals.