I only reached the Foundation Establishment stage at eighty years old, and then the system appeared.

Soon after, Yang Hongbo led his skeleton army to conquer the underworld, winning every battle and achieving victory wherever they went.

With each victory in battle, the number of soldiers under his command increased, and the newly joined skeletons, under Yang Hongbo's command and training, quickly grew into an elite force.

With the support of hundreds of millions of skeletons, Yang Hongbo's cultivation improved day by day, and he even advanced to the demigod realm, just one step away from the supreme realm of the underworld god.

On this day, Yang Hongbo stood in front of the skeleton army, his gaze fixed firmly on the distance. He said to Youying and Anren beside him, "Today, we will face an unprecedented battle. The Nether Beast Legion awaits us ahead. That ancient battlefield will be the place where we fight to the death."

The shadowy figure gripped its blade tightly and roared in response, "Rest assured, Master! We will fight to the death to help you ascend to the throne of the God of the Underworld!"

Dark Blade's eyes burned with determination: "Master, the skeleton army is fully prepared and will surely ensure that the Nether Beast Legion never returns!"

Yang Hongbo nodded slightly, brandished his longsword, and shouted, "Let's go! Let the Nether Beasts witness the might of our skeleton army!"

Hundreds of millions of skeletons marched towards the ancient battlefield, raising clouds of dust that blotted out the sun.

When they arrived at the ancient battlefield, they found it filled with an ancient and eerie atmosphere. The ground was littered with broken weapons and bones, as if telling the story of the extremely tragic battle that took place back then.

The Nether Beast Legion was already on high alert, with the leading Nether Beast Demigod riding on the back of a gigantic Nether Beast, its body as large as a mountain and exuding a terrifying aura.

Upon seeing Yang Hongbo's skeleton army arrive, it let out a deafening roar: "Yang Hongbo, you ignorant skeleton, how dare you come here to die!"

Yang Hongbo rode his skeletal warhorse forward slowly, coldly declaring, "Demigod of the Underworld, today is your end. Underworld will usher in a new order under my rule, Yang Hongbo!"

"Hmph, what arrogance! Your army of hundreds of millions of skeletons is nothing but weak skeletons!" The Nether Beast Demigod sneered disdainfully.

Yang Hongbo's gaze swept over his army, and he shouted, "Skeleton warriors, fear not! Today, let these Netherworld beasts witness our might! Kill!"

At Yang Hongbo's command, the skeleton army surged towards the Nether Beast Legion like a tidal wave. However, from the very beginning, the situation was extremely unfavorable for the skeleton army.

Even if countless skeleton soldiers were torn to pieces, they could not harm the Nether Beast. Those low-level skeletons were as fragile as paper in the face of the Nether Beast's powerful strength.

A low-ranking skeleton soldier brandished his bone knife and charged at a Nether Beast, which simply slapped him to pieces.

Similar scenes played out repeatedly on the battlefield, and the casualties of the skeleton army increased dramatically.

Seeing this, Youying was extremely anxious. He rushed to Yang Hongbo's side and shouted, "Master, this won't do! Our skeleton soldiers are too weak; they can't inflict any effective damage on the Nether Beasts!"

Yang Hongbo frowned, his eyes fixed on the battlefield. Suddenly, a glint flashed in his eyes, and he said, "Youying, don't panic. Have you forgotten how fast our skeleton soldiers level up? For every few skeletons that die, we'll have a higher-tier skeleton in our ranks."

Upon hearing this, Youying's eyes lit up: "Master is wise! In this way, although we suffer heavy casualties, our combat strength will continue to increase!"

On the battlefield, although soldiers of the skeleton army constantly fall, for every one that falls, a more powerful skeleton is born.

As time went on, the situation on the battlefield gradually changed. The low-level skeleton soldiers became fewer and fewer, and were replaced by powerful skeleton kings and skeleton emperors.

A Nether Beast was frantically attacking the surrounding skeletons when suddenly, a Skeleton King rushed out from the side, wielding a giant axe with immense power, and slashed fiercely at the Nether Beast.

The beast was unable to dodge in time and was struck by the giant axe, letting out a miserable cry as a deep wound appeared on its body.

The Nether Beast Demigod's face turned extremely ugly upon seeing this. He roared at the Nether Beast General beside him, "What's going on? How come these skeletons are getting stronger and stronger!"

The Nether Beast general was also terrified: "My lord, I don't know what's going on, these skeletons seem to be constantly evolving, we...we can't hold them off any longer!"

The Netherworld Beast Demigod glared angrily: "Hmph, a bunch of useless trash! Let me personally wipe out these skeletons!"

As it spoke, the Nether Beast Demigod rode its enormous Nether Beast and charged towards Yang Hongbo. It wielded a massive battle axe, and wherever it went, skeletons were shattered into pieces.

Seeing the Nether Beast Demigod charging towards him, Yang Hongbo showed no fear. He rode his skeletal warhorse to meet him. The moment the two met, Yang Hongbo's longsword clashed with the Nether Beast Demigod's battle axe, producing a deafening sound.

"Yang Hongbo, today is your death day!" roared the Nether Beast Demigod.

Yang Hongbo sneered, "You? You're still a long way off!"

The two engaged in fierce close combat, and for a moment, sand and stones flew and light flashed across the battlefield. Seeing their master fighting the Nether Beast demigod, Shadow and Dark Blade also led their skeleton warriors to charge forward, launching a final battle against the Nether Beast army.

As time went on, the skeleton army suffered increasing casualties, and what was originally hundreds of millions of skeletons was now reduced to only a few million.

But at this moment, none of these millions of skeletons were inferior to the Skeleton King. They exuded a powerful aura and charged towards the Nether Beast Legion like a steel torrent.

Although the Nether Beast Legion still numbered over 20 million, it was gradually becoming overwhelmed by these powerful skeletons.

A Nether Beast was surrounded by several Skeleton Kings, whose weapons relentlessly attacked it. Although the Nether Beast fought back fiercely, it was eventually chopped into pieces.

The battle between Yang Hongbo and the Nether Beast Demigod had reached a critical moment, with both using their full strength. Suddenly, Yang Hongbo felt a powerful force surging within him. He was overjoyed, knowing that this was a sign that he was about to break through to the Nether God Realm.

"Demigod of the Netherworld Beast, today is your end!" Yang Hongbo roared, his power erupting instantly, his body radiating a dazzling light, and a terrifying aura spreading out.

The Nether Beast Demigod sensed this aura and his expression changed drastically: "You...you're actually about to break through to the Nether God Realm!"

Yang Hongbo ignored it. He formed hand seals and chanted incantations. A huge beam of energy shot out from his hands and blasted towards the Nether Beast Demigod.

The Nether Beast Demigod tried to dodge, but it was too late; the energy beam instantly enveloped it.

"No!" The Nether Beast Demigod let out a desperate roar as his body gradually dissipated under the attack of the energy beams.

With the dissipation of the Nether Beast demigod, the Nether Beast army was thrown into chaos. Taking advantage of this, Yang Hongbo launched a final attack. Leading millions of powerful skeletons, he swept through the Nether Beast army like tigers descending a mountain, utterly crushing it.

The great battle has finally ended. The ancient battlefield is filled with the thick stench of blood, and there are corpses of skeletons and underworld beasts everywhere.

Yang Hongbo stood in the center of the battlefield, feeling the powerful force within his body. He knew that he had successfully advanced to the Netherworld God Realm.

Shadow and Dark Blade approached Yang Hongbo, excitedly saying, "Master, congratulations on your advancement to the Netherworld God Realm! From this day forward, the Netherworld will usher in a new era of glory under your rule!"

Yang Hongbo nodded slightly, gazing into the distance, and said, "From this day forward, the Underworld is unified under my command. I will restore the Underworld to its former prosperity, so that all living beings can live and work in peace on this land!"

Shadow and Dark Blade said in unison, "Master is wise! We are willing to follow you and create a new future for the Underworld!"

Just then, a voice echoed in Yang Hongbo's mind: "Time Tunnel Level 9 Cleared!"