There aren't many materials needed for the fire card, and there are only three kinds, namely fire crystal, demonized peachwood, and any kind of inner dan of the fire beast.

It is not uncommon for the general fire surname to be different beasts, and being biased towards this kind of caste does not mean that the origin is awakened, just like the human physique, some are biased towards the water surname, and some are biased towards the fire surname.

This kind of Neidan Lin Feng happened to have a lot of it on hand, and it was given to him by Xia Youyou at the beginning.

Although the fire crystal is precious, Lin Feng has obtained a lot from Yanli Mountain, which is more than enough for refining cards, and the other magic peach wood is the most commonly used material for refining cards, so Lin Feng is naturally well prepared.

But the most difficult step in melting the materials is the last step of fusing these three materials, you must know that the fire crystal and the inner pill of the fire beast also contain fire origin energy, but it is extremely difficult to separate the two fire origin energies and integrate them into the card.

The fire origin energy distributed in the fire crystal and the inner pill has become two kinds of reading power substances, and to some extent, they are no longer exactly the same source energy, but more or less add some impurities, becoming two similar things.

It is difficult to fuse different things, but it is even more difficult to fuse this similar source energy.

Because different materials only need to consider their melting temperature, and then melt them in the shortest time, but in order to fuse Neidan and fire crystal, one thing that also needs to be considered is to remove other impurities in it, so that the energy in it becomes the purest fire source energy.

To put it simply, what Lin Feng needed to do now was not only to grasp the temperature needed to melt these materials, as well as when to heat up and when to cool down, and how to control the distribution of the inner fire origin of the Xuanyu Ding, but also to use his spiritual power to eliminate the other origin energies in the inner pill and fire crystal in the process of melting.

What is needed for this is to master the spiritual power to the point of perfection.

That is to say, his control of mental power must reach the point of meticulousness.

That's why hot cards are so difficult to craft that many alchemists will abandon such powerful cards because they don't want to waste too much time on them.

But Lin Feng is just the opposite, he is tempering his spiritual power almost every moment, such as eating or something, he will use his spiritual power to directly control the tableware to feed.

The reason why he did this was due to the influence of the previous master of Xuanyu Ding, according to the inheritance memory left by the other party, in the control of various energies, the later it is, the more obvious the effect of this control will be, so one of the suggestions that the other party gave to his inheritor is to learn more and use more.

And he also left a set of secret methods invented by himself, which specializes in tempering the control of various forces.

For example, control the source of fire to gather near the body to form a set of flame armor...... Lin Feng was now able to compose this set of armor through fire control, but it could only form the shape of this armor, and he couldn't even show the fine patterns on the armor as he said.

In terms of the control of spiritual power, its requirement is to be able to divide spiritual power into thousands of strands and form a large cocoon around the body, which Lin Feng naturally cannot do.

……

However, because of the long-term practice according to what he said, Lin Feng had extremely strong control over all kinds of energy, so he wanted to refine the fiery card.

He sat cross-legged on the carpet, summoned the Xuanyu Ding, and threw a Flying Fire Snake's Inner Dan into it, instantly controlling the concentration of the fire origin, causing the temperature in it to rise by thousands of degrees!

The fiery red Nedan as quickly hissed and melted into a puddle of red water.

The melting of this solid material must be done in a very short period of time, otherwise the surface part of the melted layer will become vapor and evaporate if the temperature rises too slowly, and it will not become liquid at all, even in the ding.

After melting this Inner Pill into a liquid state, Lin Feng's spiritual power turned into thousands of strands and probed into it, quickly expelling some of the impurity energy attached to the Inner Dan's Inner Fire Origin.

At this time, it is the time to test his control of mental power, if the control is relatively weak, it will only be powerless in the process of expulsion, and then he will have to start again.

It's like a long-distance race, you have to get started!

The more you have control, the longer you will naturally hold on.

Lin Feng was still full of confidence at first, but in the process of proceeding, he found that his pain was no less than that of participating in the city marathon.

It's that breath, but it makes people almost want to vomit blood!

At this time, there is only persistence, and he must persevere, because once he fails, he will lose everything, and he can't afford to lose!

One second, two seconds...... Lin Feng's forehead gradually sweated, and finally when he was about to lose his bearing, the last trace of spiritual power was withdrawn, and a very faint trace of black qi also dispersed from the pool of red water into the ding, and disappeared into the wall of the Xuanyu Ding.

But when Lin Feng had just breathed a sigh of relief and his mind relaxed slightly, due to the loss of control of the fire origin energy in the Ding, the temperature plummeted, but the red water condensed together.

Lin Feng smiled bitterly: It took so much effort, but because of his own carelessness, his efforts were lost!

However, this kind of near-extreme torture made his control of mental power more handy.

After resting for a while, waiting for his spirit to return to its peak state, Lin Feng began to melt these materials for the second time.

The process of removing impurities for the second time was also painful, because the fire origin energy in Neidan existed in a line that was difficult to see with the naked eye, but it was too long, and various impurities were attached to it, so it was difficult to remove.

It took about three minutes for Lin Feng to complete this step, and then put in the demonized peach wood, which directly heated up, and the demonized peach wood quickly melted, floating in the air above the Flying Fire Snake Inner Dan solution.

Controlling the temperature in it, Lin Feng took a deep breath and put a piece of fire crystal the size of a fingernail into it after a moment of conditioning.

Before the fire crystal stone fell into the solution, Lin Feng ordered the temperature inside the Xuanyu Ding to double again, and the effect was particularly obvious: the fire crystal that was about to fall into the solution eventually turned into a fiery red solution and fell into it, bonding with the Inner Dan solution.

All Lin Feng had to do now was to remove the impurities in the fire origin in the fire crystal, and then connect the fire origin in it with the fire origin in the inner pill.

Figuratively speaking, it is equivalent to three layers of hot cards, and the top layer is demonized mahogany, and the card pattern is drawn on it; The middle layer is composed of the Inner Dan, and the fire source energy in the Inner Dan is equivalent to a curved and spiraling line sandwiched between them; The lowest layer is composed of fire crystal, and the fire origin energy in it is also equivalent to the lines of an entrenched snake.

If the impurities are removed, the two lines will naturally join into one, and the energy in them will be released when used. (To be continued.) )