Petos could only watch as his arms were severed one after another by Zeta, and his chest was pierced again and again by Zeta.
He was powerless; he could do nothing.
His eyes and body were completely unable to keep up with Zeta's speed.
"You damn test subjects!" Petos shouted.
The next second, Zeta's sharp claws pierced his mouth.
Petos seized the opportunity at that moment.
Six severed arms grew back simultaneously, not in the shape of hands, but as six sharp spikes, all lunging towards Zeta's heart.
Zeta ignored Petos's attack and directly pierced Petos's eyes.
Petos's attack arrived as expected but was blocked by an invisible barrier.
It was an item Sino had given Zeta, which could help her withstand one fatal blow.
Petos had no chance; his entire head was shredded by Zeta's sharp claws.
Petos fell.
She looked at the deceased Petos, feeling that the anger within her had not dissipated at all.
All the past memories flooded her mind; her fury did not vanish with Petos's death.
Petos died too quickly, too comfortably; killing Petos did not bring her relief, but rather left a suffocating feeling in her chest.
Petos died a bit too easily.
The deaths of her father, mother, and younger brother—these angry emotions caused her immense heartache.
She took out the red potion left by Viscount Olba.
She poured it into Petos's neck.
Black magic power began to surge violently in Petos's corpse.
Terrifying magic power erupted from him.
Petos's entire body underwent a transformation.
An armor of condensed magic power covered his body, and his entire physique doubled in size. His head also grew back, resembling a shriveled, bloodless demon's head with skin torn off.
His appearance was strikingly similar to the monsters from the First Demonic Realm.
"Viscount Olba was actually telling the truth; that red potion is the perfect demonization potion, and its effect is much better than mine!"
"Hahaha! Your name is Zeta, isn't it? I didn't expect you to give me such a pleasant surprise. Don't worry, I'll save you for last! I want you to watch your companions die with your own eyes, and then it will be your turn!"
Petos laughed maniacally.
Petos clearly felt an inexhaustible supply of magic power within him; the total amount of magic power was terrifyingly vast.
"Is this the power of diabolos?! This feeling is amazing!"
"Things seem to be a bit troublesome. Nu, quickly go and inform Lord Shadow!" Gamma said.
"No need!"
Sino appeared there.
With such a major event happening here, how could he not come?
He was not Shadow, indifferent to the affairs of Shadow Garden.
If possible, Sino did not want to interfere with Zeta's revenge.
A terrifying surge of magic power also erupted from Zeta.
The two attacked each other.
Petos's strength was now on par with Zeta's.
"I admit your strength, but I possess infinite magic power and can regenerate indefinitely. No one can kill me; this is the terror of diabolos cells!"
"I am an invincible existence!"
Zeta's eyes became even colder.
Her sharp claws shattered Petos's head.
Petos was completely indifferent to this; he could regenerate indefinitely.
But Zeta fought with increasing ferocity, her speed growing faster and faster, and her magic power increasing.
The number of times she shattered his head also increased.
Petos could no longer keep up with Zeta's speed.
Sino sensed that the magic power within Zeta was rapidly rising, and the diabolos cells in her body were full of vitality.
The diabolos cells were rapidly dividing and replicating.
During the battle, Demon Possession appeared on Zeta once again.
However, Demon Possession dissipated at a visible rate, appearing again and again, and dissipating again and again.
"Lord Shadow, what exactly is happening to Zeta?" Gamma asked.
"How powerful do you think Diabolos the Demon is?"
"That... I'm not quite sure."
"His strength is not below mine, so what about the strength of the Three Heroes who defeated him?"
"Zeta is undergoing a transformation. Demon Possession is a curse, but also a blessing, and even a trial. Only by resolving the Demon Possession in one's body through one's own power can true strength be obtained!"
"Zeta is currently in this process of transformation!"