According to the memories of some Qi refining disciples who passed through Nanze in the past, they had seen traces of Zhuyin grass in the middle and outer regions of Nanze, and because there were several evil beasts guarding them and did not dare to approach easily, they were unable to pick this spirit grass back.

The Xuanyin ghost qi in the body was about to move, and this Nanze poisonous mist miasma had a great attraction to them. Chen Feng considered that with the ability of these two Xuanyin ghost qi, even if he encountered some ordinary demon beasts, he couldn't help them, so he released them and let them absorb these filthy qi to strengthen their bodies, but Chen Feng didn't dare to let them run too far, Nanze's environment was too complicated, if something went wrong with these two supreme treasures, Chen Feng wanted to cry without tears.

"Humph!"

Chen Feng's Imperial Sword floated in mid-air, only three or four zhang high from the swamp, and from time to time, some low-level demon beasts would jump out of the swamp in an attempt to swallow him in one bite, and they were often cut into several pieces by the sharp sword qi inspired by the Wind Jade Sword before they could get close.

An ancient crocodile with a breath approaching the Great Perfection of Qi Refining suddenly rushed out of the swamp, its giant tail rolled up all over the sky and muddy water, and its body covered it, and at the same time, countless water arrows were shot out from the swamp to attack Chen Feng in the air, obviously there were demon beasts in the swamp. If a Qi Refining Cultivator was here, he would definitely be confused by these attacks, and he would even be in danger of falling, but it was a pity that he met Chen Feng!

Chen Feng waved his hand, and the countless water arrows shot straight back into the quagmire, and a large number of bubbles suddenly emerged from the quagmire, and scarlet blood water suddenly emerged from the quagmire, not to mention the ancient crocodile, Chen Feng didn't have so much blind effort to delay here, and immediately regardless of the muddy water floating in the air, he stabbed it out with a sword, and the murderous ancient crocodile was cut into two pieces and fell into the swamp. A large number of ripples and waves were immediately stirred in the swamp, densely packed, and the corpse of the ancient crocodile was instantly dragged into the swamp and disappeared. Chen Feng didn't feel the slightest loss when he saw this scene, after all, it was just a Qi Refining Demon Beast. It's just that the large number of low-level demon beasts attracted by the corpse of the ancient crocodile made Chen Feng a little vigilant, and he immediately rose into the air a few feet.

"How many demon beasts are hidden in this Nanze!"

Chen Feng sighed and suddenly turned into a blue light and left here.

After five days of searching, Chen Feng finally found a green and secluded Casting Yin Grass in the nest of the two water skeleton pythons, and easily killed one of the water skeleton pythons with the wind jade sword in his hand, and the other saw that the situation was not good and immediately plunged into the depths of the swamp to hide.

Although the Casting Yin Grass Raw Suit would waste a lot of medicinal power, Chen Feng didn't have much time to ask someone to refine the pill, so he had to take this simple and crude method and fly to the outer area of Nanze, Chen Feng found a seemingly calm lonely mountain, killed one of the Qi Refining Intermediate Demon Beasts, and then swallowed the Casting Yin Grass here to strengthen his body.

The grass is green all over, with branches like snake tails and star-shaped spots. Holding it in his hand with a trace of coldness, sitting cross-legged in the cave, Chen Feng bit the casting grass into his stomach and refined it, and as soon as he took his stomach, he felt the hot and dry air flow of the Dao to the whole body with the blood, Chen Feng did not dare to delay and immediately ran the Falling Star Recipe to refine these medicinal powers to improve his body.

Two days later, Chen Feng opened the cave and walked out, and came comfortably towards the sun, but there was not much excitement or even a hint of loss on his face.

"The effect of this casting grass is too bad!"

Chen Feng smacked his lips, the difference between the strength of his physical body now and before refining was very small, only a slight increase, it is estimated that this effect will not be of much help to the cultivation of the Hundred Refining Secret Arts, and those Jade Jian Chen Feng, who admired the Casting Yin Grass, were also speechless.

"It seems that I have to find some elixir that can increase the strength of the physical body!"

This hundred refining secret techniques are extremely beneficial to cultivation, even if it can't solve the hidden danger of mana, Chen Feng still intends to continue cultivating. "Huh!" Chen Feng was just about to leave here, but suddenly frowned and looked at the dense fog area of the western swamp, and his body turned into a blue light and flew over.

Escaping into this strange black mist, Chen Feng galloped all the way, and soon found the Xuanyin ghost qi that had been devoured in Nanze in the past few days.

"It's ...... What!"

The state of Xuanyin Ghost Qi at this time was very peculiar.

In fact, the Xuanyin ghost qi in Chen Feng's hands is two wisps, but they usually rely on each other, whether it is in Chen Feng's dantian or in the outside world, they all act together, like a pair of twin sisters. But at this time, these two wisps of Xuanyin ghost qi were really fused together and turned into a ball of pure ghost qi that emitted black light, and a dazzling crystal light flashed from time to time. Every time the crystal light flashes, it is the time when the ghost qi is the weakest, and there is even a faint tendency to re-split into two paths.

Chen Feng didn't dare to be careless, he didn't expect this change in Xuanyin ghost qi, and immediately summoned Xuanyin ghost qi into his hands. As soon as he returned to Chen Feng's side, the Xuanyin ghost qi was much quieter, and it evolved into a pitch-black ball that fell into Chen Feng's hand, and a dazzling crystal light flashed in the ball from time to time.

After careful observation for a long time, no other changes have occurred, but the luster of the ball transformed by the Xuanyin Ghost Qi has dimmed a lot, and the crystal light contained in it is not as dazzling as Fang Cai.

After half an hour like this, Chen Feng returned to the cave where he had just retreated with two orbs of Xuanyin ghost qi. In the cave, the pitch-black ball in Chen Feng's hand suddenly vibrated non-stop, the color was dim for a while, dark for a while, and mixed with a little white light.

"Bang!"

The Xuanyin Ghost Qi finally couldn't hold on, and the turned round ball shattered, and the two Xuanyin Ghost Qi suddenly became sluggish, and they weakly turned a few times in the air and returned to Chen Feng's dantian to cultivate, and at the same time, the wrapped things were revealed.

This thing broke through the blockade of the Xuanyin ghost qi, and the spiritual swimming circle immediately fled to the outside of the cave. Chen Feng snorted coldly, and the mana in his body surged in the void and condensed into a spiritual net, which was imprisoned to death, but after this thing, it suddenly spread out, slipped away from the gap in the spiritual net, and rushed towards the entrance of the cave.

This move was unexpected by Chen Feng, he didn't expect that it would still have the ability to break through the limitations of his spiritual power after being in a stalemate with Xuanyin Ghost Qi for so long. Seeing that it had fled to the entrance of the cave, Chen Feng waved his right hand and arm, and the wind and snow ring immediately disappeared from his arm and turned into a huge ancient copper ring with a diameter of two zhang blocking the entrance of the cave.

The inscriptions on the wind and snow ring lit up one by one, and the powerful imprisoning ability instantly forced out a light snake-like thing, no matter how the light snake struggled, it could no longer get rid of the wind and snow ring. After successfully grabbing the wind and snow ring, the light snake was turned back into a crystal translucent bracelet and returned to Chen Feng's hand, and the wind and snow ring came with the unknown light snake.

It is not accurate to say that the snake is alone, Chen Feng carefully observed it in his hand after successfully sealing it, and found that this thing was constantly changing its body, snakes, Jiao, tigers, etc. It was the first time Chen Feng had encountered such a strange thing, and he couldn't help but test it with his fingers, but he was horrified.

"Formless and substantial!"

This light snake really seems to be a "strange light" channeling, if it weren't for the battle with the Xuanyin Ghost Qi that consumed too much strength, Chen Feng would have no way to take it alone!

Chen Feng became more and more uneasy in his heart, worried that this thing had recovered a certain strength and escaped directly, so he simply sealed it in the wind and snow ring and imprisoned it at all times.

Xuanyin ghost qi is a famous treasure of the demon road, the origin essence of a supernatural ghost cultivator, what can make it interesting but helpless is definitely not trivial, I just don't know how the Xuanyin ghost qi found this "light", just now Chen Feng thought that the Xuanyin ghost qi had encountered some tricky monster before the reaction was so huge, so that Chen Feng could feel it a few miles away, it seems that everything is this strange light!

Chen Feng didn't know what this strange light was, but his purpose of coming to Nanze to find the Casting Yin Grass had been achieved, and he returned to the Ancient Spirit Sect after sealing it properly. This place is the periphery of Nanze, most of the demon beasts are first-order demon beasts, and the number of demon beasts above the second order is extremely small, even so, Chen Feng is still cautious. The lone demon beast was not a big threat to Chen Feng, but what about the group demon beasts? If there is a large number of anything, it will produce extremely terrifying power, not to mention these ferocious demon beasts! In Nanze, not to mention a foundation building monk like Chen Feng, even the ancestor of the Jiedan would not dare to be too presumptuous!

Chen Feng's return journey went smoothly, although he still encountered a lot of demon beast attacks, but they were all lone demon beasts at the Qi refining level, and even saved two Gu Ling Sect disciples who were chased and killed by the Tsar Ant on the way.

Because of the two Qi refining disciples, it took Chen Feng two days to leave Nanze, plus ten days of retreat when he came, which means that Chen Feng only had twenty days to go with Qi Hui and the others to find the Falling Star Stone, and before he did it again, he had to completely solve the problem of his own mana!