Too many female prisoners, a special forces soldier transmigrates and marries wildly.

Lin Feng and Bai Xiaohe faced their enemies back to back. The clash of swords and the clang of metal echoed deafeningly in the sealed cavern.

Lin Feng used brute force to overcome skill; each swing of his dagger carried the power to shatter mountains and split rocks, forcefully withstanding the combined attack of the two shadowy figures. Bai Xiaohe, on the other hand, moved with agility, her short sword flashing like a venomous snake, deliberately taking unorthodox approaches, engaging another shadowy figure in a fierce battle, relieving him of the pressure.

The battle instantly intensified. Stone boxes were swept away by the force of the energy, shattering into pieces, and the secret scrolls inside scattered all over the ground. The black iron metal box was also affected by the melee, making a crisp clanging sound.

Lin Feng's mind raced. The Shadowless Pavilion's arrival was so timely, it was as if they had calculated the exact time they would break the formation! The Ling family had been destroyed, yet the Shadowless Pavilion knew everything about the mechanisms and secret files here. What did this mean? It meant that there were Shadowless Pavilion spies within the Ling family, and even among those who participated in setting up the formation back then!

We can't delay any longer! The underwater mechanisms could be restarted at any moment, and reinforcements from the Shadowless Pavilion could arrive in droves!

Seizing an opening, Lin Feng forcefully pushed back the two dark figures in front of him, shouting sharply, "Xiao He, retreat towards the entrance!"

Before he finished speaking, he was like an arrow released from a bow. He stopped defending and used all his strength to throw the dagger hard at the dark figure who was fighting with Bai Xiaohe!

The dark figure had no choice but to parry. With a loud "clang!", his arm went numb, and his movements faltered slightly.

It was that moment of stillness!

Lin Feng had already closed in, disarming his opponent with his bare hands. He grabbed the wrist holding the weapon, twisted and snapped it! "Crack!" The sound of bones breaking rang out. The short blade changed hands, and Lin Feng retaliated, the cold blade already piercing the opponent's heart!

The dark figure didn't even utter a sound before collapsing limply to the ground.

Upon seeing this, the remaining two figures flashed with horror in their eyes. They simultaneously made a feint and retreated into the darker depths of the cave, clearly intending to use the terrain to their advantage.

Lin Feng didn't chase after him at all. He rushed to the dark stone platform, grabbed the dark gold metal box, and found it cold and heavy. Then, he looked at the scattered scrolls of documents; it was impossible to take them all.

"Let's go!" Lin Feng grabbed a few small parchment scrolls, stuffed them into his robes, and shouted at Bai Xiaohe.

The two ceased their fighting and retreated swiftly towards the water-filled corridor they had come from.

Rushing through the corridor, Lin Feng leaped into the water and forcefully pulled on the release mechanism of the grappling hook. The hook snapped open, the bronze waterwheel was freed from its restraints, and began to slowly rotate again, while the jammed blade gates also began to recharge their power.

"Hurry!" Lin Feng roared, and he and Bai Xiaohe swam desperately toward the cave entrance. Behind them, the waterwheel spun faster and faster, the "click" of the sluice gate falling became more frequent, and the shadow of death relentlessly pursued them.

When they finally emerged from the water in a disheveled state, Xu Tiande's face showed anxiety on the shuttle boat.

"Brother! Little He!" Xu Tiande was overjoyed and reached out to pull the two of them onto the boat.

Lin Feng slumped onto the deck, breathing heavily, the cold metal box in his arms pressing against his chest. The third fragment was in hand, and the tip of the iceberg of the Ling family's biggest secret had been revealed.

Iron Wall City, Garrison Command.

Lin Feng sat cross-legged on the couch, not asleep.

On the small table before him lay the dark gold metal box. The lid was open, and the third fragment of extraterrestrial black iron gleamed with a cold, eerie light, subtly echoing the previous two. Beside it were several scrolls of parchment he had casually brought along, their pages filled with records of the Ling family's shady dealings in peculiar ink…

Outside the window, all was quiet. Only the occasional footsteps of night patrol soldiers and the scraping of armor proved that this border town was not yet asleep.

Suddenly, a series of hurried and chaotic footsteps approached from afar, breaking the tranquility of the night.

Footsteps stopped outside the door, followed by Xu Tiande's low but anxious voice: "Commander! Someone from the palace has arrived! It's an imperial edict delivered with utmost urgency!"

Lin Feng's eyes sharpened, and he instantly put on his outer robe, stuffing the metal box and sheepskin scroll under his pillow.

The door was pushed open, and a cold wind swept in. Xu Tiande entered, covered in sweat, followed by a dusty eunuch dressed in the uniform of an imperial guard, carrying a bright yellow scroll.

The eunuch's face was ashen; he was clearly exhausted from days of rapid travel.

"Commander Lin Feng, receive the imperial decree!" The eunuch's voice was high-pitched, carrying an unquestionable air of authority.

Lin Feng immediately knelt down. Bai Xiaohe, hearing the commotion, also quickly came out from the next room and stood quietly to the side.

The eunuch unfurled the imperial edict and read aloud: "By the grace of Heaven, the Emperor decrees: The northern lands are the nation's bulwark, and the iron ore produced there is crucial to military preparedness and the people's livelihood. However, in the past six months, the amount of refined iron supplied by the official iron mines in Yanshan has plummeted by 30%, and its quality has also declined significantly. The court has successively dispatched Cui Hong, a senior official in the Ministry of Works, Lu Ming, an imperial censor, and Zhao Dequan, a purchasing eunuch, to investigate, but all three have... vanished without a trace, their fate unknown!"

As the imperial edict was read aloud, the eunuch's voice trembled slightly.

Lin Feng's heart sank. The disappearance of three high-ranking officials in succession from a supposedly orderly government mine was no simple dereliction of duty; it was a shocking case!

"I hereby order Lin Feng, the garrison commander of Ironwall City, to concurrently hold the title of Imperial Envoy, to immediately proceed to Yanshan and other areas to thoroughly investigate! Seek the truth, expose the mastermind behind this, recover the embezzled funds, and stabilize the northern frontier! So be it!"

"Your subject accepts the decree and expresses gratitude!" Lin Feng raised both hands above his head to receive the imperial decree, which felt as heavy as a thousand pounds. When his fingertips touched the bright yellow silk, he felt only a chill.

After seeing off the eunuch who delivered the imperial decree, Xu Tiande immediately closed the door, his face extremely grim: "Brother, this is bizarre! Yanshan Mine is the largest government-run mine in our Northwest, heavily guarded, and all the previous officials in charge were impeccably qualified technical bureaucrats from the Ministry of Works. How could accidents happen one after another? Those three officials are probably in grave danger!"

Lin Feng slowly unfurled the imperial edict, his gaze falling on the two characters "Yanshan." The refined iron produced by this mine supplied the entire country and was the absolute core of the raw materials for the Northern Territory's military equipment. A sudden drop in production, officials gone missing… this was no longer an economic case, but a crisis that shook the very foundations of the nation!

"Brother Xu," Lin Feng raised his head, his eyes flashing with cold light, "make preparations immediately. We will depart for the Yanshan Mine at dawn tomorrow."