The old man in the green robe frowned slightly. He really had no other choice but to cooperate with Qin Feng.

He hesitated for a moment, then asked, "What if you want to kill me afterwards?"

Qin Feng pursed his lips. "Don't worry, I mean what I say, I will never kill you!"

"If you don't believe me, I can swear on my inner demons!"

The old man in the green robe pondered for a moment, then smiled and said, "No need, I trust you!"

Given Qin Feng's strength, he had absolutely no reason to deceive himself.

As for any benefits, he didn't dare to think about them; just being able to survive was enough for him.

He said nothing more and poured all his fire laws and spiritual power into the red lotus.

In truth, he still harbored a slight hope that Honglian could burn Qin Feng to ashes, but he dared not reveal it.

Qin Feng focused his mind and concentrated on fighting the fire lotus.

It must be said that this fire lotus is quite terrifying, but fortunately he had mastered the Law of Power beforehand, and his physical body is very strong.

Otherwise, it would have been impossible for it to withstand such a long period of time.

Tempering the body in this way is far more effective than being beaten half to death.

Moreover, the risks involved are more effective than getting beaten half to death.

After about ten minutes, the old man in the green robe had consumed a significant amount of his spiritual power and fire elemental power, leaving him with less than 10% of his original strength.

The old man in the green robe stopped.

"Young friend, this is all I can do for you. I hope you can understand!"

He was now filled with immense fear of Qin Feng, yet his physical body remained undamaged despite enduring such a long period of time.

With such a terrifying physical body, could he kill it by fully activating his immortal artifact?

He was even somewhat relieved that he hadn't chosen to confront Qin Feng head-on, otherwise he would have certainly died in the end.

Qin Feng smiled and said, "Thank you for your help, senior. I will repay you handsomely later."

The old man in the green robe said nothing, but landed on the ground, sat down cross-legged, took out a Spirit Recovery Pill, and ate it to restore his spiritual power.

Qin Feng released his divine sense and looked around. Seeing a river not far away, he flew directly over there.

Then he found a large rock, hollowed it out, and made it into a stone jar.

Then he carried the stone vat to the river, filled it with water, and used a fireball spell to boil the water.

When the water temperature reached about fifty degrees, he took out some body-tempering elixirs and put them into the stone vat to stir.

These body-tempering elixirs are extremely rare and precious, almost all of them being tens of thousands of years old, and their medicinal effects are extremely potent.

However, Qin Feng was not short of spiritual herbs, especially those for body tempering; he had plenty of them.

After soaking in the body-tempering medicinal bath, Qin Feng's physical strength increased significantly.

With his current physical strength, he would have no problem fighting against a half-step Heavenly Emperor.

Qin Feng took out a set of clothes from his storage ring, put them on, and flew directly back to the old man in the green robe's cave.

The old man in the green robe was still refining the Rejuvenation Pill to recover his spiritual power when he sensed Qin Feng landing in front of him, so he opened his eyes and stood up.

"Young friend, why haven't you left yet?"

Although he believed that Qin Feng wouldn't do anything to him, he still remained somewhat vigilant.

Qin Feng smiled slightly. "Don't be nervous, I just came to ask if you need any pills?"

"I can really refine any kind of pill, and they'll all be top-grade!"

The old man in the green robe exclaimed in surprise, "Really?"

Seeing Qin Feng nod, the old man in the green robe couldn't help but gasp. "I never imagined you were so terrifying in the art of alchemy!"

"I do need to refine a kind of pill, but I'm not confident that I can succeed, so I haven't dared to try it easily."

Qin Feng asked curiously, "What kind of pill?"

He couldn't think of any other pills besides the Spirit Source Pill that a half-step Heavenly Emperor realm cultivator would need.

The old man in the green robe sighed softly with a bitter expression. "The Limitless Longevity Pill!"

"Huh?" Qin Feng was completely bewildered. "You're a half-step Heavenly Emperor, shouldn't you be at the Longevity Realm?"

"Alas!" The old man in the green robe sighed. "You don't understand!"

"No matter how powerful a cultivator is, their lifespan is limited if they fail to transform the spiritual energy within their body into immortal spiritual power!"

"I don't know about others, but I'm almost fifty thousand years old, and my lifespan is fifty thousand years!"

"I'll be fifty thousand years old next year. If I can't refine the Limitless Longevity Pill to extend my lifespan, I'll surely die!"

Qin Feng was stunned. Even a half-step Heavenly Emperor could not achieve immortality. Did he really have to completely transform his spiritual power into immortal spiritual power to achieve immortality?

The old man in the green robe looked at Qin Feng and smiled. "Are you surprised?"

"Actually, this is all reasonable. If one could achieve immortality at the half-step Heavenly Emperor realm!"

"Then what about those powerful beings from ancient times?"

Where have they gone now?

"Could it be that it went to another interface? It's not impossible, but we can't go to all of them, can we?"

Qin Feng nodded. "That makes sense!"

"Senior, how many years can this Limitless Longevity Pill extend one's lifespan?"

The old man in the green robe replied, "A thousand years!"

"If it's a top-grade Limitless Longevity Pill, it will last at least three thousand years!"

"More importantly, the Limitless Longevity Pill has no limitations; it remains effective as long as it is taken!"

Qin Feng asked in surprise, "Really?"

"Can ordinary mortals use this Limitless Longevity Pill?"

“Of course it’s true!” The old man in the green robe nodded. “Ordinary mortals can use it too!”

"Moreover, ordinary mortals will not only have their lifespan extended, but their physical constitution will also be strengthened, reaching at least the level of a True Immortal!"

Qin Feng blinked; this pill was simply too miraculous.

There are no restrictions; anyone can consume it.

"Senior, how many medicinal herbs have you collected? Bring them all out and I'll refine them for you!"

"By the way, I won't help you refine them for free. If one set of materials can be used to refine three top-grade Limitless Longevity Pills, I need two as payment!"

This thing is useless to him right now, but who knows what will happen in the future?

Even if he never needs it, what about the people around him?

In short, it's always better to be prepared!

The old man in the green robe was stunned for a moment, then exclaimed in surprise, "You really can refine it?"

"The spiritual herbs required for the Limitless Longevity Pill are extremely rare, and if they are wasted, it will be very difficult to gather them again."

Qin Feng smiled slightly. "I'm absolutely confident I can refine it!"

"Since you're not confident you can succeed in refining it yourself, why don't you let me give it a try?"

"You didn't just prepare one dose of the elixir, did you?"

The old man in the green robe nodded. "I prepared six portions; I'll give you one to try first!"

"If it's successful, you can have the remaining five!"

Immediately, the old man in the green robe took out a packet of spiritual medicine and handed it over.

Qin Feng took the spiritual medicine and sat down cross-legged on the spot. Then he took out the Profound Fire Cauldron and began to refine pills.

The old man in the green robe watched quietly from the side. He naturally didn't completely trust Qin Feng, so he was still very uneasy.

As he said, the medicinal herbs needed to refine the Limitless Longevity Pill are extremely rare and difficult to gather.

It took him thousands of years to collect all six portions.

If Qin Feng fails to refine it, he will definitely feel a great deal of pain.