If judged solely by the casualty ratio, he undoubtedly achieved an unprecedented victory.

Even the devastating ancient war in which countless demigods participated could not deliver such a fatal blow to the Burning Legion.

Unfortunately, Illidan, who was planning his next attack, overlooked something very important: morale and the hearts of the people.

After all, tens of thousands of the most elite soldiers had suddenly vanished without a trace, and not even a single intact corpse could be found. Even a fool would know that something must have happened. So, for a time, many people began to discuss in private what kind of terrible experiment or plan their master was carrying out.

It's important to understand that within this vast following, comprised of demons, naga, blood elves, night elves, brokenlings, and orcs, each race and each individual has their own specific needs and desires.

They didn't side with Illidan for no reason and were willing to sacrifice their precious lives for him; rather, they wanted to obtain what they craved from the original demon hunter.

For example, what the blood elves longed for was to get rid of or alleviate the pain after their magic addiction flared up, so Illidan taught them magical techniques to draw fel energy from demons.

For example, the Naga led by Lady Vashj have the Old Gods standing behind them. Who knows if they want to use Illidan to destroy their mortal enemy—the Burning Legion.

As for Akama, the leader of the Greytongue Breakers, he had long been colluding with Maiev Shadowsong, who was imprisoned, and was preparing to launch a new rebellion at a crucial moment.

In fact, the King of Outland may seem incredibly powerful, but in reality he is a disorganized mess, and there is a huge crisis hidden behind him that is unimaginable to ordinary people.

Zhang Cheng couldn't understand how "Boss Dan" managed to gather this group of guys with their own ulterior motives together, or what he relied on to maintain their respect and obedience, even if it was all just superficial.

Perhaps this is what is meant by leadership and heroic qualities?

Of course, none of this had anything to do with him, not even a single penny.

In just over three months, he had already met figures including Kael'thas, the Blood Elf prince; Lady Vashj, the Naga leader; Akama, the leader of the Broken; and the recently resurrected legendary figure, the world's first Death Knight—Taron Bloodlord…

It must be said that these "old guys" who have lived for who knows how many years have indeed mastered a lot of interesting magical knowledge and techniques.

Kael'thas controlled almost all the precious wealth left behind by the high elves;

Vashj, on the other hand, perfectly inherited some of the Highborne's in-depth research on the Well of Eternity and arcane energy;

Before Akama fell and became a Broken, he was a powerful Bishop of the Light with unique insights into the use of the power of the Light.

Talon Bloodlord needs no introduction. Once Gul'dan's right-hand man, he was not only a true plate-armored spellcaster but also highly skilled in close combat. It is said that he almost killed the human hero Turalyon in a one-on-one duel.

With the addition of Illidan, a leader who was first a mage and then became a demon hunter, Zhang Cheng has reaped considerable rewards.

Most importantly, three months later, he finally obtained the Gruul's Blood that he had been dreaming of.

Feeling the surging vitality emanating from the red liquid in the test tube, he finally couldn't help but curl the corners of his mouth and ask without turning his head, "How did you guys get this? Don't tell me someone went to Blade's Edge Mountains and killed the most powerful hill goron."

“Kill him? Don’t be ridiculous! You know what? I lost six of my best assassins for this blood. You’d better produce something useful, or I guarantee we’ll never cooperate again,” Akama complained through gritted teeth.

He would never forget the terrifying power that Gruul the Dragon Slayer displayed when he was enraged.

Even more terrifying is that the longer the battle lasts, the more Gruul will draw power from the earth and become stronger, even shattering a mountain with a single blow.

No language can describe that apocalyptic scene!

"Don't worry! It's all worth it. Give me a few days, and you'll soon receive the promised reward," Zhang Cheng reassured him with a smile.

"I hope so! Remember! Our deal..."

“I know! Our deal will never be known to Illidan or anyone else. Don’t forget, I am just a collaborator with a thirst for learning and research, and I am not loyal to anyone.”

Before Akama could finish speaking, Zhang Cheng took over the rest of the sentence.

He clearly knew who this potion was intended for, and in a way, it was part of the correct timeline of Azeroth.

"hope so!"

Akama never liked to talk too much nonsense, and he quickly disappeared into the shadows.

He had barely left for two minutes when a female demon hunter wearing a black vest and wielding two strangely shaped battle blades walked in from outside, knelt on one knee, and reported: "Master! I have gone to Hellfire Peninsula to investigate the unusual activity of the Dark Portal as you requested."

"And the result?" Zhang Cheng asked, carefully dripping a few drops of Krull's blood into the prepared solvent.

moment!

The previously dormant green fel energy suddenly surged into a frenzy!

“Just as you predicted! Someone is trying to open the Dark Portal from the other side! And many of the portals that were originally closed throughout Hellfire Peninsula have been forcibly opened, with the Burning Legion's vanguard visible everywhere. Clearly, they are about to launch a retaliatory attack.” The female elf raised her head and revealed a meaningful smile.

“Fantastic! Just as historians often say, the gears of fate have finally begun to turn. I wonder if our Outland King Illidan is ready to face his destiny.” With that, Zhang Cheng casually handed the potion in his hand to the other person.

Without a word, the female elf took it, tilted her head back, and drank it all in one gulp.

In the blink of an eye, the fel tattoos on her body emitted a blinding light, and she collapsed to the ground with a thud, groaning in pain.

The blood elf's originally fair skin was now covered with a dense layer of dark purple scales, its feet had turned into sharp claws, and its enormous wings were spread wide open.

Compared to a typical demon hunter transformation, she is closer to a dragonkin than a pure demon.

It goes without saying that Zhang Cheng must have injected dragon blood into the Demon Hunter's body through a series of experiments, and combined with the Gronn's powerful strength derived from the Rock Guardian Giant, he completely activated the earth power that the Titans had bestowed upon the Black Dragon...

Chapter 0627 Important Experimental Subjects

"what!!!!!!"

After the dramatic change lasted for a full five minutes, the female demon hunter finally could no longer bear the pain and let out an extremely piercing scream.

She felt every muscle and every cell in her body being torn apart and reassembled by powerful energy, a feeling almost equivalent to being constantly eroded by evil energy after consuming a demon's heart.

Not only that!

Her mind involuntarily drifted back to the most painful memories of her life, including the fall of Silvermoon City to Arthas's undead army, the tragic deaths of her parents and siblings, the death of her best friend under demonic magic during the Outland Wars, and her former superior at the Frozen Throne being transformed into a mindless ghoul...

These memories, one after another, that tormented and agonized her, kept repeating themselves like a magical replay.

The poor elf didn't even know whether it was these memories that caused him more pain, or the intense stimulation transmitted to his brain by his nerves.

All she knew was that she had to survive!

He must not die until he has completed his revenge!

Driven by a powerful will to survive!

Despite the scales on the female demon hunter's skin beginning to crack and green blood imbued with fel energy splattering everywhere, she maintained a remarkably fast healing rate.

Under the dual torment of destruction and regeneration, the essence of her life finally underwent a transformation.

In less than a minute, all the conspicuous horns on its head, as well as the scales, wings, and claws on its skin, disappeared, replaced by the blood elf's almost flawless body curves.

"How are you feeling, Hilna?" Zhang Cheng asked with interest, stroking his chin.

"I...I don't know..." The female elf slowly got up from the ground, gently stroking her almost naked body.

She could feel that although she had lost the tattoos Illidan had personally inscribed on her body to suppress the demonic soul, as well as her original powerful fel energy, her body was completely different from before.

To be precise, it was as if both the body and soul had been strengthened and elevated in some way.

To confirm this, Hilna reached out her right arm and grabbed the imp servant who was cleaning the room, suddenly using her ability to steal the blood energy from the servant's body.

Less than a second!

The poor wretch, caught off guard, was washed alive and turned into a dry, cold corpse, as if he had been dead for decades.

At the same time, the tattoos on her upper body that had disappeared were rekindled, and green evil energy surged into every corner of her body along her blood vessels, with a smoothness that was completely different from before.

"What did you do to me?" The female elf looked up, her face filled with disbelief.

Ever since becoming a demon hunter apprentice, she has been tormented by fel energy and demonic souls almost constantly, even having nightmares while sleeping.

Zhang Cheng chuckled and shrugged, replying, "It's simple! I've maximized your potential. Do you know why Illidan is so powerful? No matter how many demons he kills and devours, there's never even the slightest risk of his body exploding? Many people believe it's related to his deal with the Dark Titan Sargeras. Of course, I don't deny that, but the real reason Illidan can withstand such powerful fel energy is that he once used the water from the Well of Eternity to alter his physique."

"The Well of Eternity?!" Hilna gasped in astonishment.

“That’s right! The Well of Eternity, the convergence point of all magical energy in Azeroth in the past. You can imagine how powerful and pure the magical energy that permeates the entire world today must be, gathered in a well. Even just a tiny bit would be enough to change the life form of mortals, causing them to evolve to a higher level. The potion I just gave you contains a drop of water from the Well of Eternity…” Zhang Cheng explained with a smile.

However, he did not reveal that the Well of Eternity is, in a sense, part of the world soul that Azeroth was born from.

Back then, Archimonde the Defiler tried every means to ascend the World Tree, all for the sake of seizing the hidden entrance beneath the tree leading to the core of the planet, and continuously extracting the Star Soul to evolve into one of the Titans.

In fact, to the true high command of Azeroth, these were hardly secrets at all.

Without a doubt, like all those who crave power, Zhang Cheng also longs to one day seize the immense power nurtured by this planet.

The problem is that he is far from powerful enough to contain the massive magical energy of a planet, and with countless guardians including Titans around, it's best to keep a low profile for now.

Once he finds a solution, he wouldn't mind destroying Azeroth to put an end to this endless struggle.

"I see!" Hilna nodded in sudden understanding. "But I don't understand! Why would you use such precious materials on me? To you, am I not just a test subject?"

"Yes! You are an experiment, but not an experiment in the ordinary sense. To be precise, the experiments I conducted on you are very important, especially in helping me to understand the evolution of life forms in Azeroth over tens of thousands of years. In addition, our dear Lord Illidan, the King of Outland, has also explicitly requested that I find a potion that can increase the conversion rate of demon hunters."

After saying that, Zhang Cheng added Gruul's blood drop by drop to dozens of bottles of green fel solvent, and handed them to the other party without turning his head: "Give this to Illidan for me, he will be satisfied with this stuff."

"As you wish, Master."

Hilna didn't try to ask any more questions. After simply covering her private parts with her torn clothes, she took the potion and turned to walk towards the deepest part of the Dark Temple.

Watching the female elf disappear at the end of the dimly lit corridor, Zhang Cheng immediately turned his gaze to the empty corner and teased with a smile, "Your Highness, how long do you plan to stand there?"

"Damn it! When did you find out?"

Accompanied by a familiar voice, Onyxia dispelled her invisibility spell and stepped out with a frown.

“From the very beginning! Don’t use such tricks next time. I’m sure Varna has also noticed your presence.” Zhang Cheng poured the remaining nearly half of Gruul’s blood into another bottle of violet solution and handed it directly to the Black Dragon Princess.

The latter sniffed lightly, and a strange expression immediately appeared on his face: "I smell the power of the earth! What is this?"

"Goron! A special species created by the Titans and endowed with the power of the earth. Like the black dragon, they possess the terrifying power to alter the landscape. Drink it, and if nothing unexpected happens, this potion should awaken the dormant part within you," Zhang Cheng urged impatiently.

As the Dark Portal was about to open, he realized that his journey was drawing to a close.

The deadline for his departure will be when the Alliance and the Horde flood into Outland...

Chapter 0628 The Last Bottle of Water from the Well of Eternity

Without a doubt, as the most powerful individual among the existing Gorons, Gruul's blood paved the way for Zhang Cheng's final experiment.

In fact, in the three months prior, he had already completed most of his planned goals, including practical testing of the newborn hybrid whelps, using Magtheridon's Blood of Madness and evolution potions to create more powerful fel orcs, using the active spores of Zangarmarsh to cultivate giant bio-weapons, and even taking the time to do some research on void whelps and naaru.

Anyway, according to normal thinking, his insane research has long crossed the bottom line of humanity, and the number of unfortunate people who have died because of it is probably in the hundreds. He is a typical villain who should be completely eliminated from body to soul.

Interestingly, because he almost never participates in most of the operations, not many people in the entire Dark Temple know of Zhang Cheng's existence.

Most blood elves, demons, orcs, and naga only knew that there was a human in the upper realms who was highly valued by Illidan and was responsible for providing him with some interesting magical potions that could make him stronger; that was all.

Just as he was racing against time to study the immense potential contained in the blood of Gronn, Illidan, who was presiding over the graduation ceremony of a new batch of apprentices, finally obtained what he had been dreaming of.

Looking at the row of boiling green liquids in Hilna's hand, he reached out his right hand, picked up one of the bottles, and asked with a half-smile, "What did your master say? How much can this potion increase the success rate?"

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