Darkness, absolute pitch black. Whether it's the eyes, ears, skin, or even the soul and spirit are crushed, obliterated, shaken, without even the slightest ability to perceive.
This is the near-death terror that those with strong regenerative abilities, who are nearly impossible to kill, occasionally encounter — they are completely annihilated. They cannot even discern whether they are dead or alive, leaving only a futile mind struggling in self-awareness.
If this is what undying means, where even oblivion is denied, then this undying is more terrifying than the eternal rest after death; it is simply a futile existence, a futile life.
And this futility... is the divine power offered to the Demon Lord.
Likewise, in the face of such unkillable enemies who recover from this near-death horror, those who killed them must feel the same futility, bringing power to the Demon Lord as well.
