According to the information left by the Demon Lord of Doom, Lin Feng concluded that these two kinds of magic skills are very likely to come directly from the Demon Realm, and if they are cultivated, they will definitely achieve amazing results that penetrate the heavens and the earth, so he is full of expectations for the cultivation of blood.

Under Lin Feng's guidance, the Blood Demon continued to operate the Wuzhu True Demon Skill according to the established method, and soon entered an endless cycle state, while Lin Feng withdrew from his divine sense, and instead took out the Bone Demon Stone he had obtained before from the Sumeru Illusion Ring silently.

The Bone Demon Stone was packed by Lin Feng in a gourd made of silver sand in the ice cauldron, when he first got these Bone Demon Stones in the Ghost Nest, Lin Feng was still in the realm of the foundation building period, and it was not enough to refine them, now that he had condensed into a golden pill, the purity and strength of his mana were not the same as before, so he was eager to try to refine these Bone Demon Stones!

The Bone Demon Stone was transformed by the Ghost King's Xuanyin, which contained extremely pure Demon Yuan Power, but because of too much time, it would solidify into stone in the Yin and Netherworld Qi and become extremely hard bone pieces, even if it was the Ghost King at that time, it could no longer be recycled, so it was abandoned in the ghost nest.

For monks, the Bone Demon Stone is an extremely precious material, and the pure and huge magic element contained in it can be re-released, it can be absorbed by the monks who practice magic skills, and its effect is immediate, and the improvement of the realm is undoubtedly very huge!

The fundamental difference is that the cultivation of the Demon Sect is fast, so the refining of the aura is much faster than that of other monks, and some superior demons can directly devour other people's spiritual power to increase their cultivation!

The more superior the magic skill, the more obvious the devouring attribute will be, and the faster the devouring speed will be, but no matter what kind of devouring, when refining foreign spiritual power, it must use a medium, and that is demonic qi!

The purer the demonic energy, the greater the assistance to refining, and the foreign spiritual power that is swallowed will be quickly transformed into its own demon yuan with the assistance of demonic energy, and condensed in the primordial spirit to become its own natal essence, such a cultivation method is naturally much faster than ordinary meditation, but the purest demonic qi only exists in the demon realm, and the purity of the demonic qi in the cultivation realm is mostly very low.

It is precisely because of the existence of demonic qi that the cultivators of the Demon Sect far surpass other factions in terms of cultivation speed, so most of the Demon Sects, especially the powerful Demon Sects, will have the leylines rich in demonic energy, their importance is equivalent to the spiritual veins of other monks, and there are other things that are more precious than demonic qi, that is, the essence of the Demon Yuan such as the Bone Demon Stone!

The Demon Yuan Essence is something that is easier to refine, and the improvement of the realm is the most obvious, but a material like the Bone Demon Stone, if you want to refine the internal Demon Yuan, it takes a lot of effort, it requires an extremely high refining attainment, and the refining skills cannot reach a certain level, so you don't dare to think about it at all.

The cultivation before the blood demon demon relied on the demon pill in Lin Feng's hand to advance, but the refining of the demon pill was extremely slow, whether it was a Dao Sect monk or a demon sect monk, as well as a ghost or even a demon beast itself, they could all use the refining demon pill to improve their cultivation, in the same way, the monk's primordial spirit and the ghost pill of the ghost thing could also be devoured and refined by other types, but the speed of refining and absorption was far less fast than that of the demon sect monk with the help of demonic qi.

When the Blood Demon was running the Wuzhu True Demon Skill to refine the Black Dragon Kui, Lin Feng began to refine a bone magic stone the size of a fingernail.

Lin Feng tried to urge the immortal net, using the eighth-level demon pill as the spiritual power output, a ball of flame quickly rose on the fire attribute orb of the immortal net, and the bone magic stone the size of a fingernail was quietly suspended under the encirclement of the flames, and it was completely melted in a moment.

After melting, the bone magic stone was like a ball of crystal clear liquid slurry, Lin Feng frequently urged the refining method, there were countless extremely tiny particles in the liquid slurry, moving slowly in groups, and after a long time, the impurities of various attributes gathered together according to the slight difference in spiritual breath.

Lin Feng's divine sense moved, and the impurities were quickly isolated from the immortal net, and the remaining pure demon yuan was like a black spot the size of a grain of rice, Lin Feng easily packed it into a small gourd made of silver sand in the ice kettle, and a layer of sweat beads had already appeared on the corners of his forehead.

After advancing to the Formation Dan Period, the Immortal Net became more powerful than before, making Lin Feng's refining ability even higher, not only could he purify more advanced spirit ores, but also the accuracy of purification was getting higher and higher.

For all refining masters, the most troublesome and difficult thing is the hardness and impurities of the material itself, most of the materials, the proportion of useful essences is very small, the number of impurities is often more, and these impurities are extremely adhesive, mixed in the material and very even, it is extremely difficult to remove.

Only Lin Feng's immortal net has a magical quenching technique, which can completely melt the material, and then distinguish the impurities from the essence of the material from the mixed liquid slurry that is extremely difficult to separate, and get the essence of the material you need, and the purity is extremely high!

It's just that if the hardness of some materials is too high, the heat resistance of its impurities and essence is also very strong, and only when the immortal net is promoted to a higher realm can it be possible to melt it and quench it, but the amount of demon pills consumed is also multiplied at a terrifying rate.

The Bone Demon Stone is one of the extremely difficult materials to refine, and theoretically speaking, it is only possible to refine it if a monk has reached the realm of the Yuan Infant Stage, and the skill of refining the weapon must reach the level of a grandmaster.

Lin Feng forcibly broke this routine with the help of the mysterious immortal net, as well as the eighth-order demon pill equivalent to the strength of the Yuan Infant Stage, and those impurities that were extremely headaches for the refining masters were all separated one by one under the refining method of the immortal net.

More than a dozen bone demon stones, Lin Feng only refined one of them, and he had already exhausted his own mana, although the spiritual power used to refine the bone demon stone was derived from the eighth-order demon pill, but Lin Feng had already completely exhausted his spiritual power just by urging the refining technique of the immortal net!

The mana required to maintain the operation of the immortal net was simply insignificant compared to the spiritual power required to refine the bone demon stone, but even so, after the continuous operation of the immortal net for half an hour, it had already exhausted Lin Feng's mana, and the bone demon stone was difficult to refine, which can be seen from this!

After the bone magic stone is refined, the amount of the size of a fingernail is condensed into the size of today's rice grains, and the impurities occupy as much as ninety percent, but the remaining one percent is the essence without a trace of impurities, even if the refining master of the Yuan Infant level wants to quench such a pure bone magic stone, it is simply impossible to do it!

The purer the Demon Element, the more beneficial it is to the cultivation of the Demon Sect cultivators, and the more advanced it is for the Blood Demon, this level of Bone Demon Stone Essence, if it is placed in the Demon Sect's territory, even those Yuan Infant Stage Great Cultivators will definitely do their best for this!

Lin Feng took the best Huiling Pill and quickly recovered his mana, and shot the essence of the bone magic stone that had just been purified directly into the bloody abdomen, helping it refine the dozens of black dragon sunflower that Lin Feng had matured for it.

The essence of the bone magic stone the size of a grain of rice directly sank into the bloody Yuan Dan, and under the operation of the Wuzhu True Demon Skill, it quickly decomposed into countless thick black filaments, flowing along the operation of the spiritual breath to the meridians of its whole body, where the black silk passed, the medicinal power of the black dragon flower was quickly assimilated, and then fused with the mana of the blood demon itself, gathering into a pure demon yuan and flowing back into the Yuan Dan!

The cultivation of the Blood Demon requires an extremely long process, Lin Feng no longer needs to care about it, his divine sense swept around, and the other fifteen monks are still meditating and recovering, and the mana of the monks in the Dan stage is naturally long without the assistance of the elixir, relying solely on the main cultivation method to condense the aura.

While they were recovering with all their might, Lin Feng took out a jade slip left by Yan Gong, the ancestor of the Yan family, at the moment before his fall, sent a divine sense transmission to Lin Feng, telling him that there was a secret in the jade slip, but the time was short, Yan Gong didn't have time to say anything, and he had already died with the eighth-order ghost king.