The small iron boat was powerful enough and it reached the upper reaches of the Demon River in less than an hour. Across the embankment on the north bank, they could see a towering city in the darkness in the distance.
It was a city built with ten-thousand-year-old ice, mixed with some steel bars and concrete, making it extremely strong.
On the top of the city, on the undulating walls, colorful lights flickered. Those were the lights emitted by different magic crystals in the dark night.
These magic crystals are not used for lighting. The green magic crystal is the core light of the magic crystal cannon, the yellow magic crystal is a spring part of a magic crystal machine gun, and the blue magic crystal has the widest light area.
That was the halo emitted by the magic spires.
This city of ice and snow is not only equipped with sophisticated and powerful magic crystal cannons, but also with magic spires. The first magic spire is guarded by a magic wizard. They can use blue magic crystals to build a powerful magic barrier for the city.
Looking at the city wall that was more than 30 meters high and as hard as ten thousand years of ice, Ye Feng smiled bitterly: "Old Immortal, how can we get into such an ice and snow city? If I want to get in, I can only use a flying sword."
The old man Tianqin stroked his beard and smiled, "We can't use flying swords. As long as the light of the flying sword touches the blue light of the blue magic crystal, it will trigger the alarm. Two hundred years ago, we suffered a great loss due to Huo Bing's defense."
Ye Feng was helpless: "How much hatred does Huo Bing have with Daluo Jinxian? Mojiang City doesn't have such defense facilities, so why does Bingxue City have them?"
Old Tianqin's eyes became sharp: "More than two hundred years ago, this was actually a new ice and snow city. The old city was the abandoned city, which was destroyed by me personally."
Li Tiequan said with disdain: "When water comes, we can cover it with earth; when soldiers come, we can stop them. Even though they built a new city, it is tall and majestic, with strong defenses and is almost impeccable, we still found a way to enter this city."
"what way?"
The small iron boat stopped at the bank of the Demon River, and the sound of rushing water came from the bank.
Ye Feng looked in the direction of the sound and saw a man-high iron fence on the bank of the Demon River, with steaming water constantly flowing out from it.
Ye Feng was relieved: "Is this a sewer?"
"Yes, we are going to enter the Ice and Snow City through this sewer."
Li Tiequan put on waterproof clothing and jumped into the icy Mo River. He opened the iron gate, revealing an underground water pipe passage as tall as a person.
The small iron boat slowly entered the sewer pipe. The sewer pipe was quite wide, just enough for the small iron boat to enter. However, Ye Feng and old man Tianqin had to stay in the cabin.
After a while, the small iron boat sailed into the dark sewer pipe and stopped beside a dry patio. There was a row of ladders extending to the top of the patio. Through the thick iron fence, a house similar to a pump room could be seen.
Li Tiequan excitedly waved goodbye to Ye Feng and Elder Tianqin: "Master, Doctor Ye, you can go up from here. I wish you good luck."
Although old man Tianqin had white hair and beard, he was as agile as a young man. He gently grabbed the handrail and climbed to the top of the skylight in a short while.
He gently waved his finger on the iron fence, and a slight sound came from inside the iron fence. Under the will of old man Tianqin, the iron bolt on the iron fence moved slowly, and finally with a click, the iron fence bounced inward.
Ye Feng smiled and said, "Old Immortal, your willpower is so strong. The iron bolt on the iron fence must weigh several hundred kilograms, but you opened it so easily."
Elder Tianqin disagreed and pointed to his head: "My little bit of thought is nothing. Tianyong can use his thought to smash half an iceberg into pieces. His fist of thought is really powerful. The number of demons who died under his fist of thought is at least 80,000, if not 100,000."
Ye Feng broke the iceberg into pieces using his mind and stuck out his tongue. There is always someone better than you.
Ye Feng looked around and found himself in a pump room, surrounded by black mechanical hubs and rows of colorfully painted pipes, which were not sure whether they were heating pipes or water pipes, extending in all directions.
Elder Tianqin was familiar with the route and said to Ye Feng, "Go to the right and follow the red pipe."
"Is there no one guarding this place?"
"Of course there are guards, but they are all humans. The demons who think they are noble will not come here. They are all curled up in their warm beds at this time."
Ye Feng heard noisy voices coming from a distance. Two people in blue work clothes were playing cards.
Ye Feng gently touched the red pipe and felt the warmth. He asked in surprise, "What are these pipes?"
"It's a hot air pipeline. Ordinary people can't build such a big city here. Let alone live here, they will freeze into ice if they stand there for a while. However, Huo Bing found a burning hot air under the ice and snow, which allows countless demons to live here. Although Huo Bing is an evil guy, he is very talented. His magic crystal cannon is the strongest among the eight realms of the demon world, so he is our strong enemy."
Ye Feng smiled bitterly in his heart. It seemed that even the Golden Immortal was afraid of the magic crystal technology.
After passing through the pump room, Ye Feng saw some joints of the red pipes, emitting puffs of hot air.
Old Tianqin sighed and said, “This hot air gushes out from the ground, the pressure is very high, the temperature is very high, making the entire Ice and Snow City as warm as spring.
Huo Bing had found natural gas. Ye Feng said disdainfully, "We also have this hot air in our hometown, and we use it better than here. We not only use it for heating, but also for cooking."
Old Tianqin had an envious look on his face: "You can even use them to cook, which is even more powerful than us Daluo Jinxian."
Ye Feng smiled and said, "This is the power of technology."
After leaving the pump house, it was pitch black outside. There were some magic crystal street lamps emitting a faint purple-red light, which made the street look blood red.
There are eight moons in the sky, shining brightly. There is no need for magic crystal street lamps. White light looks more comfortable than red light.
Elder Tianqin pointed to a thirty-story building in the distance with a crystal-like glass curtain wall on the outside: "That's the Ice and Snow Lord's Mansion."
On the top of the building, there were several large purple characters of "Ice and Snow Lord's Mansion" shining, emitting a faint light.
Ye Feng was a little excited, feeling a thrill of entering a tiger's den and going deep behind enemy lines.
"Can I use a flying sword here?"
Pointing at the magic crystal street lamps on the street, Elder Tianqin explained: "Huo Bing is a very smart person. The entire Ice and Snow City is covered with equipment to monitor flying swords, and this place is no exception. They look like magic crystal street lamps, but they are actually monitoring equipment to monitor the energy of flying swords."