Time Travel: Did My Sister-in-Law Get Slapped in the Face Today?

However, the evil corpse also exists, destroying everything. Therefore, whenever an era begins and life and civilization develop to a certain level, the influence of the source arrives as promised, destroying everything.

They cycle and repeat each other.

However, the ancient demon gods could not live forever. So, when the demon gods' own power was exhausted, this cycle would come to an abrupt end, and the entire underworld would be destroyed. All the living beings in it would be like illusions that had never truly existed, and dissipation would be their only fate!

"The thing that caused the destruction of the underworld for hundreds of thousands of years and the extinction of countless lives... was actually the evil corpse of a demon god?"

Li Lan murmured.

The two corpses, good and evil, exist within the nature of all cultivators and living beings. When one's cultivation reaches a certain level, some people even need to sever these two corpses in order to achieve the Great Dao. The two are intertwined and difficult to understand, but after the ancient demon god sacrificed himself and reversed the Yin and Yang, they formed two completely opposing forces.

The ancient demon gods are the source of life for billions of beings in the underworld, and also the end of their destruction!

"There is also a Netherworld on Nanyao Star. Based on the Lingyin mineral crystal, it is estimated that the power of the demon god in this Netherworld is about to be exhausted and should dissipate within three to five years."

Li Lan also found a crucial piece of information!

Lingyin mineral crystals are a byproduct of the underworld and the only way for people in the mortal world to observe the state of the underworld.

"One year in the mortal realm is equivalent to a hundred years in the underworld... So, in another three to five hundred years, the underworld will be utterly destroyed..."

Li Lan frowned, a sense of urgency rising in her heart.

He must get back quickly!

"Gather enough yang energy and bring it back to the underworld, and it will become a powerful weapon!"

Li Lan murmured!

He is now certain that Yang Yi in the small mountain village has not truly "returned to life" and should still be considered a ghost.

In that case, yang energy should also be able to harm him.

As long as Yang Yi is destroyed, Li Lan can calmly rebuild the cycle of reincarnation and realize his grand ambition of helping all living beings cross the river together.

However, Yang Yi's cultivation is too strong, and ordinary yang energy is probably not enough to harm him. If you want to kill him, it would be best to borrow the "pure yang thunder energy" in the world!

This kind of aura is not only full of yang energy, but also contains a little bit of the power of heaven and earth in the yang world. In various ancient books, it is praised as the best magic weapon to subdue yin ghosts.

However, to refine pure yang thunder energy, one needs to construct a large array, find a thunderstorm, absorb it from the heavens and earth, and also prepare a container of good quality, otherwise it will not be able to withstand the power of heavenly thunder... This is quite troublesome.

His current identity is merely a battle spirit, and Xu Caiwei is also quite suppressed within the academy, making it difficult to gather all these things.

Should they just snatch it away?

It's not impossible. Even though he's only in a soul form now, it wouldn't be too difficult for Li Lan to destroy the entire Nantian Academy. The academy's vice dean Gong Jiuren, Elder Luo, and others pose no threat to him.

But he didn't want to cause too much of a stir.

"The Tao that can be spoken of is not the eternal Tao; the name that can be named is not the eternal Tao... What does it mean? What does it mean!"

Just then, Li Lan suddenly heard some sounds. He had an idea and floated over.

In front of several bookshelves, an elderly man with white hair and beard sat casually on the ground, holding several ancient parchment scrolls, deep in thought, looking exactly like a learned old scholar.

"Road to Road, very Avenue……"

Li Lan was somewhat surprised. Wasn't this something from Earth? It came from the *Tao Te Ching*!

"Where is the Way? Good and evil are hard to distinguish, black and white are hard to differentiate..."

The old man lowered his head, deep in thought. His eyes were red, as if he was being driven mad by this question. Suddenly, he raised his head, stared straight at Li Lan, and said, "Tell me, what is the meaning of good and evil? What is the significance of the Great Dao?!"

He had clearly been stuck on this problem for a very long time and was unable to extricate himself, to the point that he was somewhat mentally unstable. So, if any other living creature came near, even a mosquito or a cockroach, he would probably grab it and question it repeatedly!

Taken aback by his sudden question, Li Lan thought for a moment and then replied: