Chu Chen returned to the Ancient Immortal Valley, found a house, and began to prepare to refine the elixir, he picked a lot of elixirs in the ancient elixir field, when all the elixirs were put out, when he looked at these elixirs, his mind was spinning rapidly, he was thinking about what kind of elixir to refine these elixirs, these elixirs, can refine hundreds of elixirs, including the marrow washing pill for mortals to improve the cultivation required for the second step of power, looking at these elixirs, it took almost half an hour for Chu Chen to decide what kind of elixir to refine。

After deciding, Chu Chen began to refine, starting with the most difficult refining, it took a whole day for Chu Chen to complete the refining of the Replenishing Yuan Pill, because it was the elixir needed by the second-step cultivator, so it was more difficult to refine, but fortunately, it was finally successfully refined, but it was only a low-grade pill, and the elixir needed by the second-step cultivator was refined in the realm of the gods, which was enough to make the alchemist of the same level as Chu Chen out of reach.

"I don't know if if I eat this Replenishing Yuan Pill, will I explode and die?" Chu Chen twisted a white and purple Replenishing Yuan Pill in his hand, and said with slightly narrowed eyes, he really wanted to give it a try, but the medicinal power of this Replenishing Yuan Pill was too huge, and once a monk in the Avatar Realm ate it, there would only be one result, that is, he couldn't bear the huge medicinal power of the Replenishing Yuan Pill, and finally exploded and died.

Of course, this is the result of an ordinary monk, but he is different, the Heaven Devouring Battle Method he cultivates can quickly devour that huge medicinal power, but this is very risky, after looking at it, Chu Chen finally put away the Replenishing Yuan Pill, and with his current realm to devour this Pill, the danger factor is also very high, he feels that when he breaks through the Tribulation, he may have unexpected effects by using this Pill to impact.

After receiving the replenishing Yuan Dan, Chu Chen began to refine other pills, followed by refining the pills needed to enhance cultivation during the tribulation period, it took six days, Chu Chen refined a total of eight kinds of pills, a total of twenty-one bottles, after a day of rest, Chu Chen began to refine the pills that enhanced cultivation during the Divine Stage, refining these pills, he spent eight days, refining a total of nine, a total of thirty-one bottles, at this time, a month has been used for half a month, Chu Chen continued to refine the pills suitable for the Yuan Infant Period to enhance cultivation after a day of rest, this time, he refined a total of ten days, thirty kinds of pills, a total of ninety bottles。

"Next, we have to have a good rest, as for the other elixirs, I will let Yanran and them practice later. Chu Chen thought so, turned his head and fell asleep, this sleep was three days and three nights, after waking up, Chu Chen did not go out, but took the pill and began to cultivate, until the third day, he got up and walked outside the house.

The passage was opened with a stone tablet, Chu Chen went straight to the place of the ancient underworld holy medicine, as soon as he got there, Chu Chen smelled a rich clear air, it was originally just a white ancient underworld holy medicine, but at this time it was emitting a multicolored light, and the originally white five leaves on it had become five-colored at this time, which was exactly the same as the mature ancient underworld holy medicine he had seen in his previous life, Chu Chen came to this ancient underworld holy medicine, raised his hand and grabbed it, grabbed the ancient underworld holy medicine in his hand, and then swallowed it directly, this ancient underworld holy medicine can actually be refined into a pill, but if you want to refine it into an elixir, the materials required are all against the sky, and Chu Chen has worked hard in his previous lifeIn addition, the most useful point is that there is no pill at all to refine this ancient pluto pill, in the past, Chu Chen wanted to refine this ancient pluto pill, completely relying on his own exploration, but it is a pity that he failed every time he refined, so he didn't waste this ancient pluto medicine, he ate it directly, people can't be too greedy, otherwise they can't get the eggs, in the previous life, Chu Chen was too greedy, so he wasted a lot of ancient pluto medicine.

As soon as Chu Chen swallowed the Ancient Pluto Holy Medicine, his whole body began to flash with five-colored light, and there was a sharp pain like a needle in his body, as if each of his meridians was being stabbed with a needle.

Chu Chen sat down cross-legged, and quickly ran the exercises to refine the ancient pluto holy medicine, although the pain was severe, but Chu Chen could still bear it, with the operation of the exercises, the severe pain gradually decreased, and then slowly disappeared, Chu Chen used it for a whole day, and finally completely refined the medicinal power of this ancient plural, now, he has no poison, no poison, and his blood can detoxify others.

"It's time to go and get that ancient elixir. Chu Chen got up, returned to the Ancient Stygian Valley from the passage, and then shot away from another passage, and it didn't take long for him to reach the second Ancient Wood Elixir, this Ancient Wood Elixir also exuded multicolored light, and the five leaves turned into five colors.

"The Ancient Immortal Elixir only has a one-month shelf life, and after one, it will dissipate into the air on its own, and I must go to Dragon Slayer Valley within a month. Chu Chen took out a jade box, carefully took off the ancient holy medicine, and then put it into the jade box, and pasted a talisman seal on the jade box before putting it into the storage ring.

After receiving the jade box, Chu Chen turned around and left quickly, and after returning to the ancient valley, he flew into the sky, after breaking through an invisible light curtain in the sky, Chu Chen only felt a whirlwind of the sky, when he stabilized his body, he had already reached the thick mist miasma, did not stay, Chu Chen flew into the sky again, and in a blink of an eye, he rushed out of the thick mist miasma, and came to the sky.

Standing in the sky, Chu Chen distinguished the direction, and then turned into a long rainbow towards the place where the Dragon Slaying Valley was located, and disappeared into the sky in a blink of an eye, this place is not close to the Dragon Slaying Valley, there are still tens of millions of miles away, with Chu Chen's full speed, it is not just a few days to reach, in fact, how far the distance is is nothing, the most important thing is that once the ancient underworld holy medicine leaves the place of growth, its medicinal effect will begin to slowly drain little by little until a month later, it will automatically dissolve and dissipate into nothingness.

It took Chu Chen half a month to finally rush to the Flying Dragon Mountain Range where the Dragon Slaying Valley is located, without stopping, Chu Chen went straight into the mountain range and went straight to the Dragon Slaying Valley, on the way to the Dragon Slaying Valley, the Cheng family arranged I don't know how many formations and prohibitions, making it the same as a real mountain ancient ruins, for the Cheng family's formations, Chu Chen knows everything about these formations, so there is no formation, The prohibition can block his steps, when he broke through dozens of formations and prohibitions to reach the front of the Dragon Slaying Valley, a sword light slashed towards Chu Chen from the void, Chu Chen knew that this was the sword qi cut by a great cultivator of the Cheng clan who stayed here, Chu Chen had already taken precautions, and he avoided this sword qi with a teleportation, and when he appeared again, he had already reached the valley, and after about three breaths, an old figure appeared where Chu Chen had teleported just now, the old man frowned, and he couldn't understand how the person just now dodged his attack。

"Not good!" the old man's face suddenly changed, and he turned and shot out into the valley.