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

Yang Hongbo woke up from his dream again, but he found that he was not human, but a skeleton radiating a deathly white light.

At that moment, the voice of the divine will rang in his mind: This is the underworld. The mission to clear this level is to defeat all opponents and become the ruler of the underworld.

Only then did Yang Hongbo realize that he was actually the lowest-ranking skeleton soldier. He didn't even have a weapon. What a terrible situation!

Fortunately, Yang Hongbo's system reappeared at that moment: "Respected host, the Underworld God System is at your service!"

"Please accept the gift package from the system. Would you like to open it?"

Yang Hongbo immediately shouted in his mind, "Open it! Open it quickly! We're waiting for you to save our lives!"

"Congratulations, host, on receiving the following rewards: 1. Your mental strength has increased by 100 points. 2. You have obtained two skeleton guards at the level of the Underworld Emperor. 3. You have received one million initial points, and will receive one point per second thereafter."

Yang Hongbo accepted the system's reward and felt a surge of comfort, as if he had gained a brain. Then, two skeletons appeared beside him, but their skeletons shimmered like diamonds.

Yang Hongbo opened the system panel and saw his own attribute panel.

Yang Hongbo: Class, Skeleton Soldier (Level 1)!

Strength: 1.

Endurance: 1.

Stamina: 1.

Mental Power: 101

System points: One million +1, +1, +1...

Yang Hongbo watched the constantly fluctuating score numbers, a surge of indescribable excitement welling up inside him. He turned to look at the two Netherworld Emperor-level skeleton guards beside him; their skeletons shimmered with a mysterious and powerful light, as if telling tales of endless battles and glory.

"What are your names?" Yang Hongbo tried to communicate with them using his mental power, since he didn't even have the ability to speak and could only rely on his newly acquired mental power.

One of the skeleton guards bowed slightly and replied in a deep, hoarse voice, "Master, we don't have names, only code names. I am Ming Yi, and he is Ming Er."

Yang Hongbo nodded, thinking to himself, "If I'm going to make a name for myself in this underworld, how can the people (or skeletons) around me not have names?"

"From now on, you will be called Shadow and Dark Blade." He gave his two guards names, hoping that they would become his most capable assistants, just like their names.

"Thank you for bestowing names upon us, Master!" Shadow and Dark Blade responded in unison, their voices filled with gratitude and excitement.

Yang Hongbo nodded in satisfaction, then turned his attention back to the system panel. He noticed that in addition to the attribute panel, there was also a shop interface, which displayed a dazzling array of skeleton units, from the lowest-level skeletons to the legendary skeleton gods.

"System, how do I purchase these skeletons?" Yang Hongbo asked in his mind.

"The host only needs to select the desired skeleton unit in the shop and confirm the purchase. Points will be automatically deducted, and the purchased skeleton will immediately appear next to the host," the system explained.

Upon hearing this, Yang Hongbo immediately began browsing the shop. He discovered that although he had a considerable number of points, it was still far from enough to purchase high-level skeleton units.

For example, a skeleton general costs ten points, while a skeleton cavalry costs one hundred points. As for higher-level skeleton knights and skeleton kings, their prices are outrageously expensive.

"It seems I need to accumulate some points first, and then slowly build up my team," Yang Hongbo thought to himself.

Just then, Shadow suddenly spoke up, "Master, shouldn't we find a safe place first so you can familiarize yourself with your powers and how to use the system?"

Yang Hongbo agreed. Although he now possessed the system, he knew nothing about the Underworld, so it was best to find a safe place to proceed cautiously. "Alright, Youying, lead the way to a relatively safe place."

Shadow nodded, then led Yang Hongbo and Dark Blade deeper into the underworld. Along the way, they encountered many low-level underworld creatures, but Shadow and Dark Blade easily dealt with them all.

Yang Hongbo also took the opportunity to practice his mental strength and found that although his strength, endurance and physical strength were very low, his mental strength was exceptionally strong. He could easily manipulate some small objects and even exert a certain deterrent effect on low-level underworld creatures.

"Master, your mental strength is extremely powerful. If you cultivate it, you will surely become a great skeleton mage in the future," Dark Blade said from the side.

"A skeleton mage?" Yang Hongbo's heart skipped a beat upon hearing this. He remembered that the system had pushed his mental power so high; so that was its plan. "Alright, then I'll work towards that goal."

After a period of trekking, they finally arrived at a relatively safe valley. In the valley was a clear lake, surrounded by dense forests, and occasionally they could hear the cries of some underworld creatures, but none of them were very strong.

"Master, how is it here?" Shadow asked.

Yang Hongbo looked around and nodded in satisfaction. "Very good, this is the place. Shadow and Dark Blade, you two are in charge of guarding the area. I'm going to start cultivating."

"Yes, Master!" Shadow and Dark Blade responded in unison, then stood at the entrance of the valley and the edge of the lake, respectively, watching their surroundings warily.

Yang Hongbo found a relatively quiet place, sat cross-legged, and began to concentrate on cultivating his spiritual power. Following the cultivation method provided by the system, he guided his spiritual power to circulate within his body, constantly impacting various acupoints and meridians.

(This is unbelievable, skeletons have acupoints and meridians?)

As time went on, he felt his mental strength growing stronger and his perception of his surroundings becoming more acute.

While cultivating, Yang Hongbo didn't forget to check the system panel and the shop. He discovered that with the improvement of his mental strength, some skeleton units that were previously unavailable for purchase were now available.

For example, the Skeleton Mage, although expensive, can still be purchased with his current points.

"System, purchase five skeleton mages," Yang Hongbo said in his mind.

"Purchase of five Skeleton Mages confirmed, 500,000 points deducted, remaining points..." the system notification appeared.

As points were deducted, five skeleton mages dressed in robes and holding staffs appeared beside Yang Hongbo. Upon their arrival, they immediately bowed to Yang Hongbo and then stood quietly behind him.

"Very good, with you all, my strength has increased significantly." Yang Hongbo said with satisfaction.

In the days that followed, Yang Hongbo cultivated his mental strength while purchasing and training various types of skeleton soldiers. His army grew stronger and stronger, from the initial two people (skeletons) to the current hundreds of people (skeletons). Among them were some high-level skeleton cavalry and skeleton knights.

However, as his strength increased, Yang Hongbo also encountered more and more challenges. The Underworld was home to many powerful forces and creatures, all coveting the throne of the Underworld's ruler. To meet these challenges, Yang Hongbo had to constantly improve his own strength and his team's combat power.

"Master, a powerful skeleton army has been spotted ahead, and they are advancing towards our territory," Shadow rushed over to report one day.

Yang Hongbo frowned upon hearing this. "A powerful skeleton army? How many are there? What's their strength?"

"According to reconnaissance, they number around a thousand, including several high-ranking skeleton cavalry and skeleton knights. I even sensed several extremely powerful auras, possibly those of the Skeleton King and Skeleton Emperor levels," Shadow replied.

Upon hearing this, Yang Hongbo pondered to himself. A skeleton army of over a thousand, including a Skeleton King, was no small force. If they were to fight head-on, although his side had a larger number of soldiers, their advanced combat strength was far inferior to theirs.

"It seems I need to think of a way to outsmart them," Yang Hongbo thought to himself.

He thought for a moment, then said to Shadow and Darkblade, "You two, immediately gather all the skeleton mages and skeleton archers. I need to set up a formation to deal with this skeleton army."

"Yes, Master!" Shadow and Dark Blade responded in unison, then quickly went to gather the team.

Soon, all the skeleton mages and skeleton archers were summoned before Yang Hongbo. Looking at them, Yang Hongbo was filled with confidence. He knew that, with proper deployment, this skeleton army was no match for him.

So he began to set up an array, placing the skeleton mages and skeleton archers in key positions, and then using his mental power to connect them together, forming a powerful battle network.

As soon as the skeleton army entered the array's range, Yang Hongbo launched an attack. The skeleton mages unleashed powerful magic, while the skeleton archers fired a dense barrage of arrows. In an instant, flames soared into the sky and arrows rained down from the array, catching the skeleton army off guard and causing heavy casualties.

After a fierce battle, the skeleton army was finally repelled. Looking at the scattered skeletons and weapons, Yang Hongbo felt a surge of accomplishment. He knew this was just the beginning of his adventures in the underworld; many more challenges and opportunities awaited him.