The white-clothed nun called herself Mu Xue, surnamed Mu Mingxue, and was looking for a treasure with a peculiar structure "Klein Bottle", she said that the Klein Bottle is a kind of topological space, to be precise, a plane without edges, connected from end to end, like a sphere, but it is the same as the Morbius ring, there is only one face, it is a non-orientable two-dimensional tight manifold, which is a treasure that is relatively easier to recognize in theory, and there are few physical objects.

"The storage bag is the final refinement of the 'Klein bottle' theory. The Klein bottle, also known as topological space, is more precisely a theoretical structure. The application rate is very wide, but the items that can be refined are all starry sky treasures, and those who can master and use them are basically star masters. Mu Xue stood in the middle of an ancient ruin, opened the dark grid, took out a small box, took out some True Yuan Dan from the small box, and looked at Fang Bai: "1 bottle of True Yuan Dan, throw some away." ”

Fang Bai handed her the dice and said, "You throw it first." ”

Mu Xue threw the dice, threw a 76 points, and watched Fang Bai throw the dice with a touch of nervousness.

Fang Bai threw 2 points, was speechless, and said, "Take it." ”

"Hee-hee! It's weird to throw points like this, but it feels really fair, everything is determined by luck, and there is no feeling of being bullied. Mu Xue Meizi put away the Zhenyuan Dan in her hand, and actually showed an embarrassed expression: "Why don't I share half of you?" It always feels like it's not good to take it all. ”

Shaking his head, Fang Bai said, "Let's say okay, let's do it like this." Mu Xue, if you know the location of others in the starry sky, it will take 10,000 years to find the past, how can you shorten the trip? ”

"Yes." Mu Xue looked at the sky: "According to legend, before the primeval times, there was no stargate in each world, and then there was a very powerful world supreme, who pondered the stargate theory alone, refined the first pair of stargates since the beginning of the world, went to the starry sky alone, explored the strange world, and placed this pair of stargates, and selflessly taught this set of stargate theory publicly, after millions of years, the supreme who came out of that world has footprints all over the heavens and all worlds, and has built countless stargates, which are connected to each other. ”

Mu Xue lowered her head and looked at Fang Bai: "If you want to find someone, as long as you can find a star gate nearby, you will definitely be able to find the person you are looking for within a hundred years." ”

"Do I need to pay to use these stargates?" Fang Bai became interested: "How does the stargate work, does it cost energy to pass through the stargate?" ”

"You don't need money, but you need a huge True Yuan of high quality and solidity to activate the Star Gate. Because of the makers themselves, the Ancient Star Gate can only use true elements. However, the star gate built in the later stage can be driven by using spirit stones instead of true yuan. Mu Xue looked at Fang Bai: "You don't seem to be a sister?" ”

This topic jumped, and I was caught off guard.

Fang Bai smiled awkwardly: "I'm a man, not a sister, but a big brother." ”

"No wonder it feels weird." Mu Xue looked at Fang Bai with a strange look in her eyes for a while, and then stood back: "You asked about the matter of Xingmen, is there anything that must be done?" ”

"Just ask." Fang Bai pressed the black rope chain on his wrist and accidentally took out a plate of fragrant Baipin chicken!

"Me!" Fang Bai looked at the black rope chain in surprise: "This! ”

It's amazing, the things in the game were actually brought to reality by Fang Bai!

"What's wrong?" Mu Xue looked at the big plate of chicken, and was a little moved: "Are you going to invite me to eat?" This dish looks good? ”

Fang Bai came back to his senses from the surprise brought by the fact that he was able to use the black rope chain as a medium to take out the props in the game, and took out a plate of boiled quail eggs, a three-fresh soup, a hundred pins of rice (cooked), two pairs of chopsticks, a small coffee table, and a dish plate, and said, "You're welcome." ”

Mu Xue looked at Fang Bai suspiciously for a while, and put a porcelain vase on the coffee table: "You are very strange, our sect eats more Bigu Dan, and rarely eats." ”

But after looking at Bigu Dan for a while, she still couldn't resist the temptation of the aroma of the big plate of chicken and ate it.

Fang Bai was curious, took the Bigu Dan and poured one out, sniffed it, and his face was not good.

This Bigu Dan actually has a pungent smell of toothpaste, God knows what the ingredients are.

After eating a hundred dishes for twenty people in one meal, Fang Bai and Mu Xue found a secret door from a basement in the ruins, and after unlocking the mechanism, they walked carefully for a long time in a walkway with everlasting lamps and came to a large stone room.

"Stargate! There's actually a stargate here! It's still the Ancient Star Gate! Mu Xue looked at the metal magic circle embedded in the stone slab in surprise and became excited: "Once the Star Gate is found in the Tianjiao Battlefield, you will definitely be able to find the Starry Sky Treasure!" Fang Bai, I will teach you the Klein Bottle Theory, rebuild the True Yuan structure, and transform the Dantian into a topological space, theoretically it can have an infinite capacity of True Yuan, so that with the True Yuan Dan, our True Yuan can reach the level of using the Star Gate in the Tianjiao Battlefield. Let's activate this primeval star gate, we can escape to the outer world of the Tianjiao battlefield, and we can survive to the end without fighting, and there are starry sky treasures to harvest! ”

Fang Bai took out the furniture, arranged two sofas and a coffee table, and began to listen to Mu Xue explain the method of further condensing the true element.

Using the method taught by Mu Xue, Fang Bai took the lead in transforming the dantian into a Klein bottle structure, and the 149 copies of the dantian also changed at the same time.

In Mu Xue's further explanation, Fang Bai mastered the method of looking at the microscopic and microscopic transformation of the true element structure, and also transformed it into the Klein bottle structure.

The true element of the Klein bottle structure is called spiritual power by Mu Xue, and it is said that there is a level of internal strength above the spiritual power, called immortal power.

"How to condense immortal power?" Fang Bai was greedy enough to take a True Yuan Pill, watching the full dantian quickly shrink to less than one percent, he took another True Yuan Pill.

The quality of the true element has been greatly improved, and the quality of the true element at 1 point is tens of thousands of times that of the previous cured true element! The capacity of the dantian has also expanded tens of thousands of times, if it weren't for the Tianjiao battlefield, God knows how to make it up.

"Immortal power can't be condensed." Mu Xue shook her head: "The immortal realm is the strongest realm in the primeval period, originally there was a spell in the immortal realm that could communicate with the heavens and all the worlds, but I don't know why, this channel was closed in the heavens and all worlds, and now there is no news of the immortal realm in the heavens and all the worlds, so the condensation method of immortal power has been lost." The strongest cultivation right now is this true element that I have taught you. There should be no stronger structure in the heavens and worlds than this true element. ”

Fang Bai felt the empty dantian, taking the True Yuan Pill, frowning and putting his hand on the Star Gate Array.

On the Stargate Array, the total amount of true yuan for the two of them is less than 10% of the true yuan required to activate the stargate!

Suddenly, Fang Bai felt a burst of emptiness, the True Yuan was once again absorbed and compressed by the basic structure, and Fang Bai took a True Yuan Pill again.

The scale of the stargate magic circle is suddenly full!

Mu Xue let go of her hand, and the scale of the Star Gate Circle was still full.

"What did you do?" Mu Xue was surprised: "Why is it suddenly full?" ”

Fang Bai looked at the True Yuan Pill in his hand and was silent.

Zhen Yuan Dan: 100 products. From "The Sky of All Worlds", refiner: Mu Jianping.