As Nirvana Sovereigns, they did everything they could to sever any ties of Cause and Effect that did not concern them.
Otherwise, the Inner Demon Tribulation within the Heavenly Tribulation for advancing to the next realm could, at best, gravely wound a Nirvana Sovereign and cause the advancement to fail. At worst, it could destroy their mind and soul, leaving them to be slain by the Heavenly Tribulation!
To prevent any of that,
Nirvana Sovereigns eliminated potential sources of Inner Demon Tribulation before their next Heavenly Tribulation arrived, making themselves as invulnerable as possible.
And now, the Heartless Demon Master sensed someone closely bound to his own Inner Demon Tribulation.
The killer of the Three-Eyed Marquis!
Before the Heartless Demon Master had become a Nirvana Sovereign, the Three-Eyed Marquis had done him a great service. In return, he had promised to protect the Three-Eyed Marquis as best he could.
Now that the Three-Eyed Marquis was dead, the Heartless Demon Master had to find a way to avenge him, no matter what.
That was why he had personally ordered the Ten-Thousand Poisons King to find the killer at any cost.
Even though...
In the Heartless Demon Master's eyes, the odds of finding the killer were slim. He had barely imagined they would ever find him.
And even if they did, should the killer belong to a top power among another Peak Race, there would be nothing the Heartless Demon Master could do.
So he could only make amends for his ties of Cause and Effect with the Three-Eyed Marquis as best he could, minimizing their effect on his Inner Demon Tribulation. But he had never expected...
The Ten-Thousand Poisons King had actually found the killer.
What surprised him even more was...
The killer had appeared right before his eyes!
The instant