Among the three Undead Races under the Green Corpse Emperor, the Skeleton Race has the largest numbers, as it was very easy to create them, whereas the Spectral Race has the fewest numbers because they are the most difficult to create.
But, due to their extraordinary battle prowess and unique skills to bypass barriers, the Corpse Emperor still created them.
Currently, there are around 10,000 Spectral Death Knights whose strength has reached the Nether Soul Realm, and they are the only ones who are participating in the war today.
It was because the Spectral Death Knights that were yet to reach the Nether Soul Realm were not allowed to leave the [City of Spectrals].
The Spectral Death Knights have unique skills and excellent battle prowess, but without sentience, they could not fully execute them; and to gain sentience, any Undead Being has to reach the Nether Soul Realm.
