The Undying Emperor's Son, beings of this kind, are almost the strongest type of Immortal Kings below the quasi-Immortal Emperor level.

Their dark core is extremely precious.

In the land of darkness, even Immortal Kings from the living world, even if they are Imperial Light Immortal Kings, can hardly defeat them.

And when quasi-Immortal Emperors from the living world enter the land of darkness, they generally have to face dark quasi-Immortal Emperors.