After an arduous battle, Lin Feng and Liu Yan returned to a temporary safe haven with the secret manual. They recuperated in a cave for several days, and both their bodies and internal energy gradually recovered to their peak condition.
Lin Feng took out the manual, which he had risked his life to seize in the Netherworld Valley, and examined it closely. The cover of the manual was ancient and weathered, engraved with strange runes that exuded a mysterious aura.
When he gently opened the first page of the manual, a line of ancient characters came into view: "This is the Heaven and Earth Profound Formula. Cultivate it to the ultimate extreme, and one can shatter the firmament and reverse the cosmos."
Lin Feng's heart trembled. He knew deep down that this might be an peerless martial arts manual. However, as he continued to read, he found the subsequent content obscure and difficult to understand, as if it concealed endless secrets.
Liu Yan watched Lin Feng's focused expression from the side and asked curiously, "Big Brother Lin, what is so miraculous about this manual?"
Lin Feng frowned and replied, "It's still not entirely clear yet, but it certainly feels extraordinary. However, to fathom the mysteries within, I'm afraid it will take a considerable amount of time and effort."
Thus, Lin Feng and Liu Yan decided to stay in the cave temporarily to focus on studying this mysterious ancient manual.
Days passed by, and Lin Feng studied hard day and night, trying to crack the riddle within the manual. He discovered that the text in the manual seemed to be related to an ancient formation, and it required a specific internal energy circulation route to activate the power within.
During one attempt, Lin Feng guided his internal energy according to the instructions in the manual. Suddenly, a powerful force rebounded, and he was instantly blasted away, crashing heavily against the stone wall of the cave.
"Big Brother Lin!" Liu Yan hurried over to help him up.
Lin Feng's face was pale and blood trickled from the corner of his mouth, but his gaze was filled with determination. "I'm fine. It's just that this manual is too profound, and the slightest mistake will cause a backlash."
Despite suffering a setback, Lin Feng did not give up. He constantly adjusted his mindset and re-examined every detail in the manual.
After numerous attempts and failures, Lin Feng finally found some clues. He discovered that the formation in the manual had some mysterious connection with the arrangement of the stars in the sky.
Therefore, on a starry night, Lin Feng brought Liu Yan outside the cave. He looked up at the starry sky, cross-referenced the records in the manual, and once again attempted to guide his internal energy.
This time, a miracle happened. The internal energy circulated within his body according to a specific route, echoing the stars in the distant sky. The surrounding spiritual energy of heaven and earth began to converge toward him frantically, forming a huge vortex of spiritual energy.
Lin Feng was immersed in this wonderful sensation. He could feel his internal energy growing rapidly, and his meridians were constantly expanding.
However, this powerful force attracted nearby monster beasts. One by one, powerful monster beasts rushed toward their location, their eyes gleaming with greedy light.
"Liu Yan, watch out!" Lin Feng shouted a warning.
Liu Yan gripped her short sword tightly, preparing to face the impending crisis together with Lin Feng.
The first to charge over was a double-headed giant python. Its body was massive, exuding a terrifying aura, and it possessed the strength of the Seventh Layer of Martial Master Realm.
Lin Feng showed no fear as he met the double-headed giant python head-on. He unleashed a newly comprehended move, shooting a powerful sword Qi straight toward the python from his blade.
The double-headed giant python nimbly dodged the sword Qi, opened its two huge jaws, and spat out black venom.
Lin Feng sidestepped the venom, seized the opportunity to leap onto the python's head, and drove his sword downward.
The giant python twisted its body in agony, trying to shake Lin Feng off.
At that moment, other monster beasts arrived as well, including a ferocious white tiger and an immensely strong black bear.
Lin Feng and Liu Yan were surrounded, but they did not retreat. Coordinating with each other, they engaged in a life-or-death battle against the monster beasts.
After a fierce fight, Lin Feng and Liu Yan finally beat back all the monster beasts. Covered in blood and utterly exhausted, their eyes nevertheless shone with the joy of victory.
"Big Brother Lin, we did it!" Liu Yan said excitedly.
Lin Feng smiled and nodded. "Yes, but this is only the beginning. We need to become even stronger!"
Through this battle, Lin Feng's understanding of the manual deepened by another level. He knew that on the path of pursuing the pinnacle of martial arts, countless challenges were still waiting for them.