When this world-crossing door was inserted into the golden 'battery' sphere, only a few seconds passed.

Then, an extremely intense and strange fluctuation violently erupted from the empty space in the middle of this portal.

Boom—this fluctuation only appeared for an instant, then quickly vanished without a trace.

And in the empty space at the center of the world-crossing door where this fluctuation erupted, a perfect black sphere with a diameter of about two zhang (approximately 6.6 meters) suddenly appeared out of thin air.

Staring at this perfectly smooth, flawless black sphere, Li Hai slowly said, "This thing looks so much like the wormhole from 'Interstellar Transmigration'.

Could it be that this so-called world-crossing door is essentially a wormhole?"

If that were true, it would make sense.

After all, isn't a wormhole a celestial body that allows people to Transmigrate to other times and spaces?

"So…"

Li Hai mused, "Should I enter this world-crossing door now and see what's on the other side?"

After thinking it over carefully, he abandoned the idea.

Because Li Hai couldn't be sure what was on the other side.

What if it was a black hole?

At the same time, he also couldn't be sure if this world-crossing door was stable.

What if it suddenly broke in the middle of crossing?

Li Hai couldn't be blamed for such wild thoughts; it was simply that this Major Thousand Worlds was too bizarre.

Martial Dao, Divine Ability, spell arts, ghosts, Yao Beast, Spirit Monster, mechs, prehistoric civilizations—damn, it had everything.

This caused Li Hai, whenever he encountered something strange, to always run through all possibilities in his mind, fearing he might step into some pitfall and be doomed.

That would be a huge loss.

After acquiring the Study Hard System, Li Hai was full of confidence in his future.

He firmly believed that with this Heaven-Defying System by his side, he would become increasingly powerful in the future.

Powerful enough to eventually stand at the pinnacle of the universe, leisurely looking down upon billions of stars.

Therefore, the current Li Hai had become extremely protective of his Lifespan; he would not take risks if he could avoid them, letting whoever wanted to take them.

Anyway, as time passed, he would become increasingly powerful.

As long as he steadily endured, enduring until the end of time.

Then, the problems that could not be solved before would certainly be easily resolved after he became powerful in the future.

Therefore, why put himself at risk? There was absolutely no need.

"So—"

Li Hai looked at the stably operating world-crossing door in front of him, frowning and thinking, "What method should I use to test the safety of this world-crossing door?"

After thinking for a while…

"I've got it!"

His eyes lit up, "I'll use—the Soul-Mimicking Ape!"

The Soul-Mimicking Ape Li Hai spoke of was one of the six types of Yao Beast recorded in the True Devil Subjugation Art. (See Chapter 49 of this book for details)

Unlike other offensive, defensive, assassination, or edible types of Yao Beast.

The specific racial ability of this Yao Beast called the Soul-Mimicking Ape, as its name suggests, is to simulate a human soul.

And based on this, its physical body also simulates and transforms into that human's height, build, and appearance.

And what's interesting is that if a Soul-Mimicking Ape wants to simulate someone's physical body and soul.

It needs to ingest a wisp of that human's soul consciousness and let it reside within its own soul.

Even more interesting is that due to the Soul-Mimicking Ape's own extremely low intelligence, even lower than cats and dogs, almost equivalent to an infant.

Therefore, once an external soul thought enters the Soul-Mimicking Ape's soul, it can easily control its soul body and physical body.

And the so-called soul consciousness is actually a section of the soul's tendril extended to the outside world, not what ordinary people take for granted as a Divided Soul or Incarnation, so even if it breaks outside, it will only dissipate, not harming the main soul in the slightest.

So, as long as the trick is found, any person with a normal soul can easily control a Soul-Mimicking Ape and make it do anything for them.

To explore dangerous areas, to touch dangerous things, even to commit suicide.

All are possible.

Even before the soul thought perishes, the controller can leave a simple command in the Soul-Mimicking Ape's soul.

Allowing it to continue certain simple behaviors for a short time without being controlled.

For example, after entering the world-crossing door and reaching another world, if it loses the soul connection with this side, it can still wander around the current area and then return to this side through the world-crossing door, even without Li Hai controlling it.

In short, in a sense, the Soul-Mimicking Ape is a natural outer Incarnation that can be Possessed and attached to by anyone—a low-end version.

Hmm… saying it's natural doesn't seem quite accurate.

Because according to the vague records in the True Devil Subjugation Art, the ancient Old Ancestor of this Yao Beast originally did not have this peculiar ability of 'being able to be Possessed by everyone'.

It was the ancestors of Hunting Deer Pavilion, generation after generation, continuously cultivating and transforming the Soul-Mimicking Ape Yao Beast, that finally evolved this bizarre ability, almost akin to suicide.

So, in essence, the Soul-Mimicking Ape is actually a man-made Yao Beast, created by human interference over generations,

Finally molded into a Yao Beast with specific abilities.

Just as wolves on Earth were domesticated into dogs by humans, and seeded watermelons were also domesticated into seedless watermelons by humans.

In any case, after deciding on this plan, Li Hai once again dispersed this illusory body, reappearing in the side hall of Guiyou Cave Heaven, and then traveled all the way to Eastern Forest Garden.

The reason he had to go to this barren wilderness was that Li Hai had happened to be raising a small group of Yao Beast in a certain part of it during this time, including three juvenile Soul-Mimicking Apes.

But it didn't matter; the True Devil Subjugation Art recorded a cruel secret method that could rapidly mature Yao Beast by consuming their Lifespan.

Under the effect of this method, a Yao Beast could be matured in just three days, but correspondingly, the Yao Beast's Lifespan would also only have three days left.

It was a trade-off.

In short, for the next three days, Li Hai stayed in the Young Military Supervisor's residence behind closed doors, putting all his energy into maturing the Soul-Mimicking Ape.

So, three days later—

Guiyou Cave Heaven, deep within Eastern Forest Garden.

In a grassland with continuous stone walls, Li Hai looked at the sturdy man squatting blankly on the ground in front of him, with an ordinary face, no hair or fur, and muttered,

"Except for its incredibly foolish eyes, its overall build and appearance are exactly like a human's. How can it be called an ape? I don't understand."

Actually, before this Yao Ape was matured, it was indeed covered in black fur and looked like an ape.

Who would have thought that once it matured, it would undergo such a perverse development, transforming from a monkey into a human form in a short period, which was truly astonishing.

But none of this was important.

What was truly important was to Possess it and then use it to test the safety of the world-crossing door.