The dog-shaped spectral beast was actually a fragment of the soul of the Undying Heavenly King.
According to the Sword Spirit, the Undying Heavenly King was the most unique existence in the Netherworld back then, also considered the longest surviving.
Throughout the ages, there have been several Netherworld Kings in the Netherworld, but there is a saying that the Netherworld King flows like water, while the Undying Heavenly King endures like iron.
Although the Undying Heavenly King is not truly immortal, when his life expectancy is exhausted, he goes to the Dead Spirit Mountain in the Netherworld to receive a unique spiritual inheritance.
The life expectancy of the Undying Heavenly King is usually the same as that of the contemporary Netherworld King. Once the Netherworld King perishes or disappears, the mission of the Undying Heavenly King is nearly complete.
