"There is no rush in the matter of cultivation for the time being, you can wait until you meet with your father and mother before you can cultivate. But this cave, I hurriedly came in, I don't know if there are people or things inside, what kind of situation is it?"

The cave is about five meters wide and only seven or eight meters long, and Xiao Ling's eyesight can be seen to the end at a glance. The cave was empty, there were no stone tables and chairs, no stone beds and stone benches, not even a trace of living habitation, it looked like an ordinary cave.

If someone else looks at it and doesn't see anything special, they just leave and don't pay attention to it. But Xiao Ling has experienced the trial of patience and carefulness, so naturally he will not just leave with a casual glance, and Xiao Ling always feels that this cave is a little unusual.

Xiao Ling carefully explored the entire cave inside and out, but found nothing special, just a small pebble in each of the three inconspicuous places in the cave. However, since it was a cave, it was normal to have small stones, and Xiao Ling didn't think there was anything strange about it.

"It seems that I am thinking too much, this is just a normal cave. Xiao Ling laughed at himself and stepped forward to leave here.

"Hmm, that's not right!" Xiao Ling suddenly stopped when he walked to the entrance of the cave and noticed something strange.

"At this time, it is early in the morning, and the sun is just right outside, why is there no light shining in the cave? And there is no light source in the cave, but the light and darkness in every place are exactly the same, that is, the most suitable degree for the human eye, isn't it too unreasonable. Also, there is not a trace of dust in the cave, and there are no creatures such as snakes, insects, rats and ants, which is very different from ordinary caves. The more Xiao Ling thought about it, the more strange it became, and his brows furrowed.

"It seems that the investigation just now is still not careful enough, I have to investigate more carefully!"

Xiao Ling examined it more carefully this time, and finally found a very small sword-shaped groove in an extremely inconspicuous corner.

"How did this groove form? Why is it here? Is it the reason for the strange phenomenon in the cave?" Xiao Ling carefully observed the groove while his mind kept thinking.

Xiao Ling thought about it for a long time, but he couldn't think of a reason, but what could be concluded was that such a strange phenomenon was definitely not something that ordinary people could do, and it must be something that could be done by people with advanced cultivation, so he decided to use the true yuan to test one or two.

Xiao Ling carefully injected the true element into the sword-shaped groove, for fear that he would use a little more force and destroy the groove, but the groove did not react to Xiao Ling's tentative move.

Xiao Ling saw that it was not possible to test it with the true yuan alone, so he silently used the "Burning Heaven Technique" to test it, but the sword-shaped groove still did not have a trace of reaction.

Then Xiao Ling tried the "Xuanbing Sealed Heaven Technique" and "Zihua Mitian Technique", but there was still no reaction at all.

"Hey, I don't believe in evil. Repeated temptations were useless, which not only aroused Xiao Ling's interest, but also aroused Xiao Ling's unyielding temperament.

"However, the three masters have tried the tricks given to me, but none of them worked, how else can I try?" Xiao Ling muttered to himself, lost in thought.

"By the way, this groove is actually sword-shaped, so I'll try it with sword qi, maybe it will be useful. Xiao Ling's heart moved, and he had a plan.

"Ling Xiao!"

The brilliance flashed, and the divine sword Ling Xiao was impressively in his hand.

Xiao Ling pointed the tip of the sword at the sword-shaped groove, silently used the true yuan, and stimulated a faint sword qi into the groove.

Injected by the sword qi, the sword-shaped groove quickly flashed a faint blue light, and then dimmed again. Although the blue light was extremely faint and fleeting, it was still seen by Xiao Ling, who was staring at the sword-shaped groove.

"Hey, there's a door!" Xiao Ling was overjoyed in his heart, and then used more True Yuan to inject a slightly more powerful sword qi.

The sword-shaped groove quickly flashed with a blue light, but it was a little more obvious than before.

Using the sword qi to test the results, but because the sword qi was weak, he couldn't get a substantial effect, Xiao Ling tried again, but this time he used fifty percent of the true yuan, thinking that this time the strength should be enough.

As soon as Xiao Ling's sword qi touched the sword-shaped groove, the groove emitted a burst of dazzling blue light, but that was all, there was still no change.

Xiao Ling's sword qi swayed, raising the true yuan to eighty, but this time the sword-shaped groove did not react at all.

"It's weird, it was still a masterpiece just now, why did I increase my strength, but I didn't react?" Xiao Ling was very puzzled in his heart, not to mention encountering this extremely abnormal thing, he had never heard of it.

"Could it be that I used too much force to destroy this sword-shaped groove? ”

The sword-shaped groove was stimulated by the sword qi, and suddenly a dazzling blue light suddenly appeared.

"I know, this groove must only react to a certain amount of sword qi, and the sword qi used by the caster cannot be allowed to react beyond this limit, I think as long as I find the most suitable strength, I can make this groove reveal its secret. ”

Xiao Ling clapped his hands, and was very happy to find out the key for himself, but then his face was sad: "The key to the problem is to find it, but how to find the most suitable strength, do you want to try it once?"

After thinking about it for a long time, Xiao Ling decided to find out the approximate range of strength first, and then slowly increase the strength from low to high to test.

After a long time, after Xiao Ling's many experiments, he finally found the most suitable strength. Under the sword qi swing, the sword-shaped groove burst out with a dazzling blue light, instantly filling the entire cave.

Although the cave is filled with blue light, if you look at it from outside the cave, let alone blue light, you can't even see this cave, and the place where you see is an ordinary mountain wall that can no longer be ordinary.

The cave was full of blue light, and Xiao Ling knew that he had found the most suitable strength size. Before Xiao Ling could be happy, a suction force suddenly appeared in the sword-shaped groove, and as soon as that suction force appeared, it instantly became larger with lightning speed, and before Xiao Ling could react, he slammed towards Xiao Ling and sucked Xiao Ling towards the groove.

Faced with the sudden strong suction, Xiao Ling didn't know whether it was good or bad, and out of the instinct of self-preservation, he immediately stimulated the cultivation of the whole body to resist this suction. Who knew that Xiao Ling's cultivation in the middle stage of his victory didn't even have the slightest room for resistance, and he was instantly sucked into the sword-shaped groove.

As Xiao Ling was sucked into the sword-shaped groove, the blue light that filled the entire cave also disappeared in the blink of an eye, as if it had never appeared. The three inconspicuous pebbles in the cave were also sucked into the sword-shaped groove together.