The third Styx River was the "Cocytus River," known as the River of Lamentation and the River of Wailing.
It also symbolized regret and despair. Formed from the tears and wails of countless Sinful Souls, it forced the dead to repeat the saddest thing they had experienced in life again and again, continuously enduring regret that cut deep into their souls.
The resentment within it even far surpassed that of the Great Wilderness City of Wrongful Death.
The Styx Remnant Soul implanted this river's laws into the Earth Origin of the Blood Prison Space, transforming them into the Grievance Furnace and giving the Blood Prison Space an additional source of power.
The Sinful Souls that fell into the furnace had their Grievance Qi, Slayer Qi, power of regret, and other negative emotions forcibly extracted.
This could not only accelerate the expansion of the Blood Prison Space, but also transform the Blood Ming Asura's Slayer Qi into weeping Slayer Qi that carried "spiritual erosion." In battle, it could directly shake an enemy's mind and dredge up the sins they had committed while alive.
This held enormous strategic significance for the expansion of the Blood Prison Space within the Primordial Underworld.
The fourth Styx River was the "Phlegethon River," known as the River of flames. Its waters were like flowing magma, passing through the abyss of Tartarus and existing solely to burn and punish souls guilty of heinous crimes. It represented the fiery punishment of violence and evil deeds.
Although its form was different, in Styx's view, its function was almost equivalent to the Eighteen Layers of Hell in the Great Wilderness: punishing Sinful Souls and cleansing their sins.
When the Styx Remnant Soul used the Blood Prison Space to erode the authority of the Five Styx Rivers, the erosion of this