Heart demons could be terrifying—or not.
Everyone developed negative thoughts and emotions over certain things, and those could affect their cultivation.
As their cultivation advanced and their minds grew clearer, such emotions became harder to stir.
Even when they arose, there were ways to resolve them.
But when a heart demon grew strong enough to become another personality, it became truly terrifying!
A deeply righteous person's heart demon would be utterly evil, forever tempting him into darkness until he died.
For someone deeply evil, it would be the very picture of virtue.
That was how it worked when a heart demon arose from within.
A Demonic Soul was a Demon Emperor's fatal weakness.
Shatter it, and the Demon Emperor would die on the spot!
Every Demon Emperor guarded his Demonic Soul carefully, giving no one an opening.
To destroy one, its owner would have to be gravely weakened and already badly wounded.
Yet the Heartflame Demon Emperor was still at his peak!
No matter how he analyzed it, the Heartflame Demon Emperor could not understand how Zhao Chen, the Thunder Emperor, had made a heart demon arise within him.
And this heart demon seemed unlike any he knew.
Under Zhao Chen's control, the Heartflame Demon Emperor felt like a puppet being forced to move by its strings.
He struggled, his Demonic Soul shaking violently.
Invisible Heartflame began to burn fiercely around his Demonic Soul.
Yet amid wave after wave of thunder, the Heartflame Demon Emperor grew dazed.
Step by step, he even lost the ability to think.
Through the haze, he recalled that tens of thousands of years ago, the Thunder Demon Clan Chief, the Thunder Heavenly Demon Emperor—one of the Extraterrestrial Evil Clan's Thirty-Two Great Clans—had apparently targeted a Late Saint Grade Heavenly Sovereign of the Great Thousand World.