Everyone who fell into the Infinite Fortress was separated. Li Xing was closest to Kibutsuji Muzan, so he was thrown to a very distant place by Nakime.
"Is this the Infinite Fortress? No gravity? No, it's a magnetic field, a very chaotic magnetic field, with no sky or ground, just constructed from countless buildings. Every side can be the ground, or a door, or a wall."
Touching the structure of the Infinite Fortress and seeing himself standing on an inverted staircase, Li Xing quickly understood the principle of the Infinite Fortress. It was just a maze-like place built in a space, and the Blood Demon Art could actually affect the magnetic field.
"If I consider the floor beneath my feet as the North Pole, then I only need to simulate the same magnetic field to fly in this Infinite Fortress, and even reach the speed of a high-speed train."
After figuring it out, Li Xing tried to simulate the magnetic field with data, enveloping his whole body. The moment the simulation was complete, Li Xing was repelled by the floor beneath his feet and shot straight up to the wall above, crashing into it headfirst.
"Hahahaha, so this is the Infinite Fortress! Is that all, Miss Nakime? Science is more fun than Blood Demon Art!"
Li Xing quickly adapted to the chaotic magnetic field within the Infinite Fortress, flying through the air and laughing triumphantly, constantly taunting Nakime.
Then Li Xing prepared to fly in one direction, as he had already smelled the scent of demons.
"Oh? I'm really unlucky to have run into a bunch of low-level demons. Well, I'll help you."
Li Xing looked at the tens of thousands of low-level demons below, who were fighting with some of the trainees from the Hashira training. Since he saw them, Li Xing decided to lend them a hand.
"Breath of Snow, Third Style: Collapsing Snow!"
A blade energy filled with immense destructive power erupted. These thousands of evil demons were all wounded, with large and small injuries, but not many died.
Li Xing deliberately left these low-level demons for the trainees to fight. If they had no opponents, they would probably go to the Upper Moons. To avoid more deaths, Li Xing decided to do this.
"Thank you! But how can you fly?" a unharmed Demon Slayer below shouted at Li Xing.
"You're welcome. You still need to resolve this yourselves. I'm leaving." After speaking, Li Xing quickly flew in one direction. Given the current situation, he needed to find Nakime first, and then control her to locate the other Hashira.
"Thank you anyway. My name is Murata, what's yours?" Murata shouted at the departing Li Xing, but Li Xing had already flown far away and couldn't hear him.
...
At this moment, Nakime had been found by Tamayo and Yushiro, along with Obanai Iguro and Mitsuri Kanroji.
In Nakime's view, there were four enemies in front of her. However, from Obanai Iguro's perspective, there were three demons and one new Upper Moon Four. It should be manageable.
"Mitsuri, let's eliminate those two demons first, and then jointly defeat the Upper Moon."
As soon as Obanai Iguro finished telling Mitsuri his plan, Tamayo and Yushiro directly attacked.
"Blood Demon Art: Bewitching Blood, Visual Dream Aroma."
Yushiro took this opportunity to try and get close, using his Blood Demon Art to control Nakime.
Nakime merely flicked her biwa gently, and Tamayo and Yushiro fell into the depths below. Li Xing, coincidentally, caught Tamayo and Yushiro.
"Mr. Li Xing?"
"Miss Tamayo and Yushiro, you fell from above, which means Nakime is up there, right?"
Above, Obanai Iguro was surprised by the demons fighting each other, but he couldn't care less and rushed forward.
"Breath of the Serpent, First Style: Slithering Serpent!"
Mitsuri followed closely behind. However, Nakime strummed her biwa again, and Obanai Iguro was instantly sent flying upwards, his attack missing its mark.
A wall suddenly appeared in front of Nakime. Mitsuri, exerting too much force, crashed directly into the wall, and was then repelled by the impact, falling down like Tamayo.
Li Xing was flying upwards with Tamayo and Yushiro in his arms when he suddenly felt a dark shadow, no, a white shadow, appear above and collide directly with his face. All four of them fell onto the floor at the lowest level.
"Ouch, this head-pad wave is a bit painful," Li Xing grumbled while being pressed under Mitsuri.
"Oh dear, Xing-kun, why are you here? Ah~ I'm so sorry, I didn't mean to." Mitsuri's face instantly turned red when she saw Li Xing pressed under her. She quickly stood up and helped Li Xing up.
"You encountered Upper Moon Four, right? Come, hug me, I'll take you up." Li Xing understood the situation now, and the rest would be easy.
"Mmm... my hands aren't enough. Yushiro, I'll give you a hand." Looking at the three people in front of him, Li Xing felt he couldn't hold all three. So, he decided to throw one up. This unfortunate soul would be Yushiro.
"Bastard! I'll kill you!" Yushiro shouted at Li Xing in the air.
Mitsuri was a little confused. Li Xing seemed to know these two demons well: "Xing-kun, those two..."
"Oh, it's true. The Master sent them, you just didn't know. They are not enemies, don't worry." Li Xing gave a brief explanation, then flew up with Mitsuri and Tamayo.
"Xing-kun, are we flying? Wow! So cool!"
Arriving above, Li Xing saw Obanai Iguro being toyed with by Nakime, unable to land a hit, unable to get close, and constantly crashing into things, looking quite disheveled.
"Kanroji, are you alright!" Obanai Iguro subconsciously asked as he saw Mitsuri return. But when he saw Li Xing holding Mitsuri, his face darkened.
"Miss Tamayo! Yushiro!" Li Xing shouted, and immediately drew his Nichirin blade and lunged at Nakime.
"Blood Demon Art: Thorn Technique."
Several fleshy seeds suddenly appeared in the air, and then grew into many steel-like thorns, which shot directly towards Nakime. This was a Blood Demon Art that Tamayo obtained when treating a bystander in Asakusa whom Muzan had turned into a demon. In the original work, this move could temporarily suppress Muzan.
Things were not that simple, of course. Nakime simply sat there and strummed her biwa a few times, and Li Xing suddenly appeared in another place. Tamayo's Blood Demon Art was easily blocked by several walls, and Yushiro was also blocked by a door that suddenly appeared in front of him.
"No, Nakime can teleport others to different places. This cannot be unlimited. Just now, I saw a door on the opposite side close, but there was no enemy there. Every time a door opens, another door closes, and these two are opposite each other, with Nakime at the center."
Li Xing pondered what had happened in a room. Now that he was teleported to an unknown location, he decided to first figure out the rules by which Nakime controlled the Infinite Fortress.
"Nakime doesn't seem to know that the Infinite Fortress has rules. It's not in the memories of the copied Heavenly Dao. If every door is centered on Nakime, then for every door controlled, there will be a door on the opposite side. If the distance is the same, then her position can be found according to this pattern."
Li Xing suddenly realized. Indeed, every technique has a flaw. If there isn't one, it must be that one is too stupid.
"Breath of the Beast, Seventh Style: Spatial Perception!"
(The original manga does not describe this, but I believe that everything has a beginning and an end, a cause and an effect. Just as Li Xing traveled through worlds because of a system, and where the system came from, it was created by Li Xing. The reason Nakime's Infinite Fortress can ignore Earth's gravity is because it is an independently opened space. The incomplete rules within the space affect the magnetic field. We can call this chaos.)