Su Yehan's speed was not slow, in just ten minutes, he had already descended to a position of five hundred miles.

But even in this position, he still couldn't sense where the bottom was.

This shows that this underground cave is at least 2,500 miles long.

Su Yehan didn't stop and continued to walk down.

Six hundred miles!

Seven hundred miles!

Eight hundred miles!

Up to a thousand miles!

When Su Yehan descended to one thousand miles, he finally sensed that two thousand miles below, there was a change.

This discovery shocked his heart, and the speed of descent was a few points faster.

When he descended two thousand miles again, he saw a vast white expanse below, and this endless white glow blocked the exploration of his perceptual ability.

"Do you want to go down and find out, perhaps, under this white mang, there really is a prehistoric civilization or an alien civilization!"

Su Yehan thought so in his heart, and after a slight hesitation, he entered the white mang.

When Su Yehan entered the white mang, his powerful perception ability lost its effect, and he didn't know how much distance he had dropped.

However, just when he was a little impatient, the white light around him suddenly dissipated, and Su Yehan entered the underground world.

Sweeping his gaze, all kinds of towering giant trees abound, and this underground world is no different from the outside world.

"That's?" At this time, Su Yehan suddenly saw that there was a decaying steel building in the distance.

"Is this underworld really left by a prehistoric civilization or an alien civilization?"

Su Yehan was shocked.

At this time, Su Yehan finally knew why humans would bomb this place.

That is, the creatures in this underground world must have had contact with the human race, and it is very likely that conflict has broken out.

Without thinking much about it, Su Yehan's speed exploded and he hurried forward.

This flight took more than an hour, and just when Su Yehan thought that there were no creatures in this underground world, in his sight, he saw a team of hundred-zhang giants.

"These hundred-zhang giants are the same size as the resentful spirit skeletons in the canyon, could it be that the resentful spirit skeletons in the canyon are formed by the death of people in this underground world?"

"Since you are a person from the underground world, if you are killed, you will definitely be able to obtain energy points!"

Su Yehan thought so, and the wolf body headed towards a group of barbarians in front of him.

"It's the demon clan here!"

"The beast of the demon clan is here!"

When this group of more than 20 barbarians saw Su Yehan for the first time, they roared angrily and killed Su Yehan.

It's still the same sentence, don't ask why Su Yehan understands it, because the whole universe must speak Chinese.

"It's up to you, it's not enough to see!" Su Yehan sneered, opened his mouth and spat out a cloud of Nether Wolf Flame, smashing it towards the barbarians.

"Boom!"

Although the power of the Netherwolf Flame cannot be compared with the Void Element Slash, the Netherworld Destruction Light, etc., but with Su Yehan's many evolutions, the power of the Netherwolf Flame is already good, how can these barbarians with only brute strength resist it.

"Ding! Congratulations to the host for killing the barbarians and gaining 80,000 energy points!"

"Ding! Congratulations to the host for killing the barbarians and gaining 90,000 energy points!"

"Ding! Congratulations to the host for killing the barbarians and gaining 80,000 energy points!"

......

With the death of the barbarian people one by one, the prompt sound of the system sounded in Su Yehan's mind at the same time.

"These big fools, although they only have brute strength, can provide a lot of energy value!" Su Yehan thought excitedly.

Even if a barbarian only provides 80,000 energy points, hey, let's still count it like this.

One eighty thousand, ten eight hundred thousand, one hundred eight million, one thousand is eighty million!

Kill 10,000 barbarians, that's 800 million energy points.

After settling this account, Su Yehan felt that this underground world was prepared for him to evolve again.

According to Su Yehan's calculations, since this underground world is under Skull Island, the size will inevitably be similar to that of Skull Island, and there are millions of barbarian people living in such a large area, which is not much.

After easily eliminating this group of barbarians, Su Yehan spread his powerful perception ability and continued to fly forward.

"Ding! Congratulations to the host for killing the barbarians and gaining 100,000 energy points!"

"Ding! Congratulations to the host for killing the barbarians and gaining 90,000 energy points!"

"Ding! Congratulations to the host for killing the barbarians and gaining 100,000 energy points!"

Ten minutes later, Su Yehan met a pair of barbarians again, and without the slightest patience and pity, he directly shot and killed all the other parties.

And Su Yehan also earned two million energy points again.

In this way, Su Yehan relied on his absolute strength and strong perception ability, and in the next dozens of days, he kept killing the barbarians.

"System, open the attribute panel!" On this day, Su Yehan commanded the system while flying forward.

"Host: Su Yehan!"

"Species: Nether Wolf!"

"Level: Level 10!"

"Skills: Extreme Speed, Extreme Strength, Nether Poison, Nether Wolf Flame, Extreme Spiritual Sense, Yellow Spring Corpse Qi, Nether Poison Flame, Tengyun Riding Thing, Killing Thunder, Death Shield, Void Element Slash, Netherworld Destruction Light!"

"Energy value: 20 billion points/100 billion points!"

"Haha, it's only been a few dozen days, and I've gained eight billion energy points, and at this rate, I can evolve again in four or five months at most. After Su Yehan looked at his attributes, he was very satisfied with the acquisition of energy value.

However, what Su Yehan didn't know was that as more and more barbarians he killed, thousands of miles away from here, in a towering city, a barbarian man in armor sat on a wide stone chair, listening to the report of the people below.

"What, you mean that there is a demon clan slaughtering the people of this city lord?" said the barbarian city lord's voice like a rainbow.

"Yes, City Lord, it is conservatively estimated that the demon clan has killed at least seventy or eighty thousand people from our city!"

"It's just presumptuous, the demon clan and my barbarian clan are mortal enemies, this demon clan still dares to come to my barbarian world, it's really looking for death, the city lord will go to meet him!"

After this person finished speaking, he left the palace and city where he was, and led thousands of barbarian armies towards Su Yehan's location.

However, what he didn't know was that Su Yehan was also flying towards him at this time.

Just an hour or two later, the two sides met.

"The beast of the demon clan, dare to enter my barbarian, the city lord is tired of seeing you alive!" The barbarian city lord's voice was like a rainbow, and the giant sword in his hand pointed at Su Yehan.

"This barbarian claims to be the lord of the city, so in this underground world, there is also a hierarchy of dignity and inferiority, and it is also organized!" Su Yehan thought excitedly: "If you can find a city, then it will be much easier to obtain energy points!"