The meaning of "nether" was the concealment of light.
In ancient times, Cang Huang, the sixth Heavenly Emperor, had created written characters. Observing heaven and earth and drawing upon the Heavenly Dao, he had used the three thousand heavenly orders as his foundation to create the arts of runes and word spirits, becoming the Dao Creator of their heavenly orders.
From then on, every heavenly order and every Great Dao had its own unique written representation.
When Cang Huang created the character for "nether," it referred specifically to the interval between dusk and night, or the hours before dawn.
The curtain of night covered the sky, yet the sun had not fully risen, or had not completely set.
Cang Huang had also used "nether" to represent yin spirits, which existed between life and death, as well as the unique heavenly orders born from them.
Thus, Youdu and the Nether Sea had also come to be called the Netherworld.
When Chu Xisheng and his companion entered the Netherworld alongside Si Huangquan and Azure Bird Jingwei, he sensed countless streams of undead power gathering around him, squeezing and repelling him with all their might, trying to push him out of the Netherworld.
The human-path dragon qi Chu Xisheng had gathered was condensed from the will and vital essence of countless humans. In a sense, it could be called a representation of "life," and naturally provoked the power here into opposing it.
The Netherworld happened to possess a power similar to human-path dragon qi.
The vast majority of yin spirits in the world regarded Youdu and the Nether Sea as their home, their place of shelter and rest. It likewise held the thoughts of countless yin spirits.
Thus, in theory, Chu Xisheng could not enter this place as the Human Sovereign.
But this