Coming to the seventh underground floor, Lin Fei quickly discovered a problem.

From the previous situation, it is not difficult to find a rule, that is, the further down, the higher the importance of the experiment. It is not only reflected in the experimental object, but also in the investment cost and research intensity.

But on the seventh basement floor, there is only one kind of "experiment".

Mankind.

It's not Beamon, who is physically strong and has ferocious powers, it's not an arcane with outstanding mental power, it's not a demon with grotesque evil powers, and it's not a multi-eyed clan with a variety of pupil arts.

It is an ordinary human being, whose innate physique cannot even be compared with that of orcs.

"Strange, why are all the experimental subjects here human?" Xiao Shiyu said in surprise.

"What advantages or special features do you say the human race has compared to the major powerhouses?" Lin Fei sneered, basically guessing the reason.

Xiao Shiyu suddenly realized.

Cheap!

Human beings have a low level of life, a short growth cycle and lifespan, and do not have the power of the innate endowment of arcane core and alien pupils, so they are the cheapest test subjects.

Not to mention a top-notch high-end technological civilization like the Protoss, even a weak technological race that is still in the stage of nuclear weapons and electromagnetic weapons can mass-produce humans through cloning technology - even a race like the Arcane that does not follow the technological system can obtain a large number of humans by raising them to refine soul stones!

The seventh floor is divided into many laboratories, and the content of the experiments in each room is different.

A small number of petri dishes can be seen that have not yet been destroyed, and they are soaked in various "humans" with cheap life nutrient solutions - if they are transformed into this form, they can still be counted as humans.

Here, Lin Fei even saw many images from science fiction movies.

Hairless, degraded eyes, thick knuckles that have evolved into sharp claws, a brain that is directly exposed, and extremely long mouthparts. The skin of the whole body has long been festering and peeling off, exposing the majestic blood-colored musculature.

It's like a creeper in a science fiction movie, or a licker.

It's just that this creature is still different from the science fiction movies - it has a small crystal embedded in its skull, which is connected to the nerves all over the body. Not only can it accept the commands of the Protoss, but it is also like an energy reactor, which can provide powerful power.

And on its back grows a pair of huge fleshy wings, which obviously provide flight, and behind it is a strange tail, which is sturdy and has a sharp end.

It's just a test class, and in front of the door is a simple description of the experiment: Test Specimen 996, Hunter. Low threat, low cost, high controllability, and mass production.

In addition to this, there are several different types of human test subjects.

For example, it is not an exaggeration to say that the spirit life created by destroying the physical body of a human being, preserving its soul with a special magnetic field, and creating it through xenoradiation. The ghosts created in this way can grow themselves by devouring other spirits, and although the body is weak, its potential should not be underestimated.

These ghosts all have grudges, and the stronger the grudges, the stronger they become. Completely exterminated human nature, only knows killing and devouring, and there is almost no obedience to speak of.

There are even creatures labeled as "failures" by the Protoss, and that life form makes Lin Fei feel amazingly familiar: werewolves and blood clans!

It is also a transformation of human beings, resulting in its mutation and the creation of creation, but it is a complete failure, waste, and garbage in the eyes of the Protoss.

The growth limit is low, the weaknesses are ridiculously large, even the most common silver weapons can cause fatal damage to them, and the Bloodlines are afraid of the sun.

"Is this the origin of the blood clan and werewolves?" Lin Fei couldn't help but be surprised, he really didn't expect this to be the case.

But new questions have surfaced.

The Arcane Clan, the Crystal Clan, the God Clan and other strong clans were all on the verge of extinction in Lin Fei's era, why did the "failed products" of the Blood Clan and Werewolves have been passed down?

Faintly, Lin Fei had a mysterious intuition, there must be a big secret hidden behind this, a secret buried by multiple heavenly ways!

It's just that in this situation, he didn't think much about it.

"Shadow Demon!" Xiao Shiyu suddenly exclaimed in surprise.

On the ceiling and walls of this laboratory, there were several black shadow demons, among which were the shadows of Lin Fei and the others.

They are no longer just shadows, but a real and special lifeform, like a liquid, which only manifests in the light.

Several Shadow Demons hissed in horror, evaporated in an instant under the holy light, and turned into shadows again and returned behind the three of them.

The number of spirit sons of the three of them returned to normal, and there was no sign of the spirit child jumping.

Only the shadow of the Arcane King is sheltered from the shadow energy, protected from the light.

To be merciful to one's enemies is to be cruel to oneself.

Lin Fei had no reason to think about him.

"Are you sure this will only happen once?" Lin Fei asked in a deep voice.

"Don't worry, there must only be one time!, what my father said, even if he is an archon, his Spirit Son Leap can only be used once for the same target!" Xiao Shiyu said with an oath.

Although she doesn't look very reliable, it's different when it comes to the King of Nanling.

The vision and judgment of the Heavenly Spirit powerhouse are still beyond doubt.

The three of them did not delay in the slightest and returned along the long road as fast as possible.

"I didn't expect it to be so easy," Xiao Shiyu was in a good mood, smiling extraordinarily brightly, and her eyes narrowed into crescent moons, "What kind of dangerous life forbidden area, isn't it quite peaceful-"

Her voice stopped abruptly, and the smile on her face froze instantly.

Because at the entrance of the seventh-floor laboratory, like a black tide, a large number of monsters suddenly poured in.

"Well, yes, we're safe, safe. Lin Fei sneered and complained, and in an instant, he waved the scepter in his hand, bursting out with immeasurable holy light.

"Boom-"

The white holy light was incomparably gorgeous, like a violent torrent, reaching the ceiling and the ground below, filling and submerging the entire passage.

For a while, all kinds of terrible screams and screams were endless, and even the screams were different.

Many monsters instantly evaporated into green smoke in the holy light, and their forms and spirits were destroyed.

"Kill it!" Lin Fei's eyes lit up, and he simply decided.

There is no other way to go.

The two of them showed their might, and the storm of holy light opened the way, sweeping everything with a devastating force.

They were the same, with the agility of a cheetah, they swooped down quickly, directly up to the sixth floor.

And at the moment of landing on the sixth-floor passage, Lin Fei's pupils shrank slightly, and Xiao Shiyu's face turned even pale.

Because in their sight, they were full of shadow demons and various mutated lifeforms, and even the ghosts of the Templars.

Layer upon layer, even on the walls and ceiling, there were all sorts of ferocious monsters crawling, opening their bloody mouths, roaring, and drooling from their mouths.

Towards the trio of cullings.