The demon lord's vault was heavily guarded, and Zhang Heng felt a lot of terrifying aura.

"There is a demon king-level powerhouse guarding this ......place," Zhang Heng thought in his heart, but his face was silent.

He finally entered the vault.

"The demon lord has an order, you can choose your own elixir to heal your wounds, and store the elixir in the stone chamber of Jiazi No. 13, thirty steps forward with your left hand. ”

An old man wrapped in a black robe walked out of the shadows, he was already very old, his face was deep and deep, he didn't know how many years he had lived, although he maintained restraint, Zhang Heng could still feel the killing intent emanating from him.

Compared with the Green Python King and the Netherworld King, this old demon's killing intent is more direct and intense.

Zhang Heng guessed that maybe he was an old monster who had survived from ancient times to the present, and the monster beast had a long lifespan, so it was not surprising that he had survived until now.

It is precisely because he has experienced the battle with the human race in ancient times that he has such a strong killing intent.

"Thank you. ”

Zhang Heng followed his guidance and walked into the stone room.

In the dark, there are more than one pair of eyes observing him, and if Zhang Heng dares to make the slightest move, they will immediately suppress it.

Even, Zhang Heng had a feeling that these old monsters were probably expecting him to really make some outrageous moves, so that they could justifiably kill him.

"Dealing with demon beasts is really not an easy task. Zhang Heng hadn't felt like walking on thin ice for a long time, he exhaled lightly and walked into the stone room.

The stone chamber was empty, and on both sides were shelves made of white jade, on which were placed not elixirs, but storage rings.

Zhang Heng swept it at a glance, and there were thousands of storage rings, but it made his heart skip a beat.

He casually opened a ring, and his divine thoughts swept it, and the elixir was piled up like a small mountain, but it made a trace of surprise pass through his eyes.

"The demon lord's heritage is so profound......

He opened several storage rings one after another, and the elixir stock in it was not a small amount, and there were many precious elixirs, which made Zhang Hengyou very excited.

He finally knew why there were so many old demons guarding this place.

The foundation of a stone chamber alone is so thick that you can imagine how many treasures there are in the entire secret vault?

No wonder the Netherworld King was jealous, he obviously knew very well what a chance it was to be able to enter the Demon Lord's Vault.

"The demon lord asked me to choose the elixir alchemy to heal my wounds, and only gave me a month, which may not be without the intention of taking the school exam...... Zhang Heng knew that the opportunity given by the demon lord was not so easy to take.

If he does not recover within a month, then the demon lord's confidence in him will be greatly reduced.

In his opinion, Zhang Heng couldn't even do such a trivial thing as healing, so how could he expect him to do alchemy?

Therefore, Zhang Heng can't hide his clumsiness, he must show his talent, the longer the time, the safer he is.

"My injury is indeed a serious injury, ordinary recuperation, I am afraid it will take about three years......" Zhang Heng is very clear about his situation, this time he fought repeatedly, and the injury was fundamental.

The blood and qi were greatly damaged, the spiritual power was exhausted, and even the divine soul was damaged.

This kind of injury may last a lifetime for ordinary people, but for Zhang Heng, it only takes three years to fully recover.

If there is a pill to complement it, then less than a year, it will be enough.

Of course, in fact, Zhang Heng wouldn't take that long, because the Xuantian Tree would wake up sooner or later, and when it entered the growth period, its vitality would increase dozens of times, which was enough for Zhang Heng to completely recover within a month.

But now, the Xuantian Tree has no signs of awakening, and Zhang Heng can't count on it, so he has to change his method.

"Breakthrough!"

Zhang Heng took a deep breath, and a hint of madness flashed in his eyes.

If he can break through to the middle stage of Jindan, in the process of breaking through, his body will be refined with spiritual power, coupled with the particularity of his exercises, this kind of spiritual power refining will achieve the effect of rebirth...... Naturally, most of his injuries will be recovered.

Zhang Heng was an immortal in his previous life, and he rebuilt in this life, what he lacked was not any mental tempering, nor any understanding, for him, there was no shackles to break through the realm, what he lacked was spiritual power.

As long as his spiritual power is enough, his realm can advance by leaps and bounds!

However, the earth's resources are poor, even if Zhang Heng swept the treasure house of Qingyang Palace and Sword Sect, the wealth he got was not much, not to mention, he had a "big family" to take care of, and he couldn't swallow everything alone.

When he broke through the Jindan, he consumed the spiritual power of an entire medium-sized spiritual vein, and now to break through to the middle stage of the Jindan, the spiritual power required is even more astronomical!

Therefore, he has always placed his hopes on the Xuantian Tree, as long as the Xuantian Tree enters the growth period, he can absorb the "immortal qi" above the heavens as his spiritual power reserve.

It can be said that Zhang Heng can enter the Yuan Infant and turn into a god...... The most critical factor is that it will all fall on the Xuantian Tree.

"However, at this moment, an opportunity is placed in front of me......" Zhang Heng looked at the dense storage rings here, his eyes were slightly hot.

He simply sat down cross-legged, and as soon as he stretched out his hand, he summoned a storage ring.

In the secret vault, several divine thoughts transmitted and communicated.

"Is this kid finally going to start alchemy?"

"He has broken through the test of Babel Tower, and is proficient in the transformation of plants and trees and the way of alchemy, and it should not be difficult to heal. ”

"Hmph, it doesn't matter if it's difficult for him, anyway, if he hasn't recovered for a month, I'll personally take action and kill him!"

"That's a waste, I haven't eaten human flesh in many years, so it's better to let me swallow it in one bite!"

Divine thoughts converged like a storm, and many cruel laughter came from the darkness.

Zhang Heng felt a little, but he didn't say anything.

These old demons are deliberate, they want to affect his mentality, but it's a pity what kind of person he is, how could he be calculated by these old guys with bad intentions?

Under the gaze of the old demons, Zhang Heng kept taking out the elixir in the storage ring.

"Millennial Yellow Essence ......"

He directly grabbed a elixir like a large radish, threw it in his mouth, and chewed it heavily.

The slightly bitter juice spread in his mouth, and then all of it was transformed into pure spiritual power.

"Hey, what is this kid doing?"

"He's not alchemy, he's taking elixir!"

"Isn't he crazy?"

"He's not afraid of blowing himself up?"

The laughter of the old demons stopped abruptly, and they were all stunned by Zhang Heng.

This guy is actually devouring elixir alive!

Of course, the elixir can be swallowed, but very few people will do this, first, it is very wasteful, swallowing the elixir raw, and refining it into an elixir, naturally the latter is more valuable, and second, it is a three-point poison, even if it is an elixir, the process of alchemy is also a process of resolving the poison of the medicine......

But Zhang Heng completely ignored this, he kept taking out the elixir from the storage ring, like gnawing a big radish, and kept sending it into his mouth.

Squeaky ......

The sound of his chewing was so abrupt in the silence of the vault.

The old demons were almost stupid.

"He's already swallowed five hundred elixirs!"

"The scariest thing is that he is not dead yet!"

"Isn't he a human race, but a demon beast?"

The old demons were a little confused, and they were shocked by Zhang Heng.

Such a savage devouring elixir is probably only a demon beast.

Demon beasts don't know how to alchemy, especially before they transform, they don't have a way to get the elixir, and when they see the elixir, they naturally swallow it in one gulp.

The demon beasts are large in size, and their physical strength is much higher than that of the human race, and the so-called poison cannot affect them, so they have the capital to swallow the elixir.

But Zhang Heng, obviously just a human race, can eat elixir like a demon beast, which makes the old demons messy.

"A thousand!"

"Can this kid still be considered a human being? he still doesn't die after gnawing a thousand elixirs!"

"Damn, even if it's Lao Tzu, I'm afraid that if I chew a thousand elixirs, I'm afraid it will be burst!"

Unconsciously, a group of old demons gathered at the door of the stone room, and they looked at Zhang Heng sluggishly, a little frightened.

Zhang Heng didn't notice their arrival, he was wholeheartedly preparing to break through.

His dantian seemed to have turned into a huge furnace, and after the elixir was put in, it was immediately melted, and wisps of pure spiritual power flowed into the golden pill......

With every trace of influx, Zhang Heng's aura became stronger!

"Quick, notify the demon lord!"

There was an old demon's face that changed dramatically, and things were completely beyond their expectations.