After thinking about it, Shi An casually struck a golden blade and slashed directly at the courtyard wall, a crack five inches long and one inch deep appeared, and the golden blade dissipated after completing its mission.

Shi An immediately felt the aura near the place where he was hit, and sure enough, there was a stronger golden aura in that place than in other places.

Then he changed places and shot out three golden blades of the same size, the difference was that the first one dissipated after cutting into the wall three inches deep, the second one dissipated after one inch, and the third dissipated after just touching the wall lightly, and felt the remaining concentration of gold aura after three blows, the first time was the least, and the third time was the most.

He also did those tests on water archery, wood rattan technique, stone protrusion technique, and fire knife technique, and similar results were also obtained.

"Well, I see, all spells don't consume all the aura, and those parts that don't have the effect they should have will be restored, so if the power of thunder and lightning emitted doesn't work, it will be restored to thunder aura. Shi An seems to have found the crux of the problem, "This idea is very useful, it seems that if you encounter a difficult enemy in the future, in order to save aura, you must let all the parts of this spell be effective." ”

It was just an experiment to solve the collection of thunder aura, but Shi An got an idea of using spells that would benefit him a lot in the future, which would also bring immeasurable dividends to the entire human world.

This is a later story, so I won't mention it for the time being.

If you can use the Spirit Gathering Formation to compress these spiritual qi in the spirit stone beads that have been exhausted, it will become a thunder spirit stone.

The last question is how to stimulate the power of thunder and lightning, and how to make this thunder and lightning exert the least effect, so as to have the most aura left?

According to Wu Wei, it was found that the throat had thunder and lightning because it was excited to break the Ding furnace when it was heated to a certain extent, and it seems that the high heat is a way to excite it, and the spiritual power consumed to break the Ding furnace is too large, so it should be reduced as much as possible.

After holding the throat into the Cave Heaven Stone, Shi An started a new experiment.

Five days later, Shi An was ecstatic and jumped out of the Cave Heaven Stone with a stone bead in his hand.

The stone bead is the size of a spirit stone, exquisitely clear, and there seems to be thunder and lightning flashing inside.

An An jumped out of the corner of the west wing and climbed on Shi An's shoulder, Shi An asked her a little smugly: "Do you look at the Lei Lingshi?"

An An replied with his divine sense: "The one who cut the river, according to my recollection, is almost like this, you turned all the thunder power in your throat into aura?"

Shi Andao: "It's not complete, but there shouldn't be much left." I have done many experiments, and the final method is to ignite the flameless black gold in the spirit gathering array and directly bake the throat, place a very small wood chip on it, and burn it for a while, and the thunder and lightning will hit the wood chip, and the remaining spiritual energy will all be compressed into the lower grade spirit stone that has exhausted the spiritual energy. No, it's finally made one. I'll do the rest after a while. ”

He took a breath and said, "Actually, I have a new discovery. ”

"Whoever cuts the river, don't sell it, tell the old lady what it is. An An said impatiently.

"Thunder aura is actually not a separate aura category, I found that it is actually a mixture of four kinds of aura: metal, wood, fire, and earth, I really have no way to calculate the proportion between them, otherwise there is no thunder and lightning, and I estimate that I can also make thunder spirit stones!"

"The old lady still thinks it's a great discovery, hehehe, that's it? Someone in the spirit world has already measured the ratio between them, and it is not uncommon to be able to simulate the thunder aura according to this ratio. It's just that they don't have Taijia...... Hmm, by the way, the one who cut the river, this formation can't be named, it's your spirit gathering array, so you can't make a spirit stone. An An said dismissively.

Shi An didn't show disappointment, but asked, "My mother said that the spirit world is the upper level of this world, are the monks in it all powerful, and do they still have extremely powerful mental methods, spells, and magic weapons?"

"Cutting the river, what you said is not true, there are also an extremely large number of mortals in the spirit world, and the monks are also low-level like you, but the cultivation environment is better and the cultivation resources are richer. As for the upper immortal realm, the difference between cutting the river is too great, and the cultivation resources are incredible, so let's talk about these when you have the opportunity to ascend in the future. Don't waste time, hurry up and clean up the thunder force, and then smelt it out, you want materials and impurities, and don't delay. ”

Another few days passed, and when An An saw Shi An again, the tired man threw her a jade box and said, "Give you impurities, I'm going to take a break." "Then jump into the Cave Stone again.

When An An picked the lid of the jade box with his front paws, his excited eyes lit up.

A day later, Shi An, whose aura had been replenished, came out of the spirit gathering array.

He took out two spirit stones and a five-inch square piece of material from the storage bag, and carefully examined them.

The two spirit stones are exquisitely clear, and silver light is streaked inside from time to time, and it seems that a subtle thunder roar can be heard, which is far more agile than the spirit stones of other attributes, but one is slightly dimer, obviously not as abundant as the aura contained in the other.

He muttered, "It's only one and a half, but it's better than nothing, but I don't know how to use it." ”

Look at the material again, it is also crystal clear, and the depth of the delicate bone color is intoxicating. What's even more strange is that it is still like a living thing, absorbing the surrounding aura, although this absorption is imperceptible, Shi An can still faintly see it with his subtle divine sense. This is by no means the nature of a typical intermediate material.

After admiring them for a while, Shi An put them back in the storage bag and began to ponder his next move.

The action plan to kill Sun Lang, which took two days to prepare a few days ago, now seems a bit hasty, because the time was indeed very tight at the beginning, so there are many flaws in both the design of the entire operation and the specific implementation steps.

For example, when he went to the street to commit a crime, he only considered besieging Sun Lang, and did not consider what to do if someone else was there to assist Sun Lang, and only considered using the sharp dagger to sneak attack, and using the three-strand fork to bless his most powerful attack spell golden blade, and did not consider how to ensure that the opponent could be put to death.

Now it seems that the offensive magic weapon in his hand only relies on the dagger and the three-strand fork, and the defensive magic weapon only relies on the handkerchief, and the magic weapon is seriously insufficient; the lack of extremely offensive spells, and the defensive spell is not strong enough, which is the shortcoming of the Infinite Law of the Sea of Fog itself, and he has no other source of learning clever spells, and he is all counting on the third mountain room of the Dongtian Stone after entering the Yudan period, and the formation and divine sense that he is best at have not come in handy at all.

Thinking of this, Shi An was a little glad that Sun Lang didn't come over in person that day, if he really acted according to the plan at that time, I'm afraid that if he didn't kill Sun Lang, the preparatory work he had worked hard for so long would be in vain, and it would be impossible to get close to Sun Lang as a disciple of the outer sect in the future.

"Everything is for the best!" he couldn't help but think of what Master used to say to himself when he was alive.

The assassination of Sun Lang cannot be done overnight, it still needs to be managed slowly, fortunately, he did not arouse Sun Lang's suspicion, and there is still a lot of time to prepare, so let's start with the preparation of magic weapons.

With the policy set, he settled down and began to make plans and preparations.

But he didn't expect that in fact, Sun Lang had already doubted him at this time.