Not long after Lin Mu and the others entered the Thunder Rock Valley, the air outside the valley shook slightly, and several black shadows flashed out like ghosts.

"Senior Brother Tomb, that Lin Mu seems to have discovered us." A dark shadow spoke, his voice was a little hoarse and cold, and when Lin Mu entered the Thunder Rock Valley, his gaze stayed at their place for a moment.

"What can he do if he finds out, but he has defeated two guys who have just entered the Nirvana realm, the ancient key is bound to be obtained by our Demon Rock Dynasty, wait for me to hold him back, Li Pan, you are responsible for grabbing the ancient key." In the middle of several figures, a man said indifferently.

"Senior Brother Tomb, don't worry, I will definitely grab the ancient key." The other smiling man nodded, it turned out to be a Nirvana Realm powerhouse, but the momentum on his body was much weaker than Chen's tomb.

Then the Chen Tomb waved his hand, and several figures swept into the Lelei Rock Valley together.

Thunder Rock Valley, because of the relationship between being shrouded in thunder and lightning all year round, the demon beasts here have all mutated, not only coming and going like the wind, but also being able to spit thunder and lightning, which is much more powerful than ordinary demon beasts.

After Lin Mu and the three of them entered the Thunder Rock Valley, they went straight to the center of the Thunder Rock Valley, and encountered many demon beasts along the way, but they did not entangle too much, and after a short repulsion, they continued to go deeper.

In the center of the Thunder Rock Valley, there is an extremely large and ancient stone hall, standing quietly there.

Lin Mu and the three of them were the first people to arrive here, the door of the stone hall was closed, without any stop, and the three of them directly pushed the door in.

The corridors in the stone hall are criss-crossed, if it is an ordinary person, even if they come in, they can only go around in circles, but Lin Mu's spiritual strength is strong, and he quickly explores the correct path.

"Let's go this way."

Lin Mu walked in front, followed by Lin Dong and Qingtan.

The three of them ran for a few minutes and came to a spacious stone room, which had a strong medicinal fragrance, and it was obvious that this was a storehouse used to store all kinds of elixirs.

In the center of the stone room, there is a small yellow tree, and from a distance, the kind of branch seems to be a mysterious rune made of nature, as if it can communicate the power of heaven and earth.

"Heavenly Rune Spirit Tree."

Lin Dong's eyes lit up when he saw this small tree, this was the Heavenly Rune Spirit Tree that could help him break through to the Heavenly Rune Master.

"You should know the method of collecting the Heavenly Rune Spirit Tree, let's do it, we still have to find the ancient key." Lin Mu said lightly, and then he and Qing Tan also started to move, in addition to the Heavenly Rune Spirit Tree in this stone room, there are also a large number of elixirs.

Lin moved, and swept towards the Heavenly Rune Spirit Tree, the Heavenly Rune Spirit Tree already has some superficial spiritual intelligence, once someone approaches, the branches will attack, and its branches have a highly poisonous body, called the Heavenly Rune Poison, which is the general Nirvana Realm sticky, and it will be extremely troublesome.

The figure flickered, Lin Dong avoided the attacking branches, and appeared at the trunk of the Heavenly Rune Spirit Tree, and there was an extremely peculiar rune on the trunk, this rune was the center of the Heavenly Rune Spirit Tree, and the strange energy all over his body was condensed on this rune.

Lin Dong's heart was a little excited, his palm bent into a claw shape, and then suddenly poked out, and the fierce wind burst out, grabbing the tree pattern fiercely, and then pulled it hard, and the rune was pulled away from the tree trunk.

The tree pattern was removed, and the Heavenly Rune Spirit Tree also withered at a rate visible to the naked eye.

Just as Lin Dong was about to put the tree pattern into the Qiankun bag, a black shadow suddenly burst out and came straight to the tree pattern in Lin Dong's hand.

"Look for death."

Lin Dong was furious, and his other hand was clenched into a fist, smashing towards the black shadow.

The black shadow didn't expect Lin Dong to react, and in a hurry, he could only raise his hands to resist.

With a muffled bang, the black shadow flew out directly upside down, smashed on the wall of the stone room, and then slid to the ground, cracks appeared on the wall, and a blood stain also flowed from the corner of the black shadow's mouth.

"You dare to snatch something from me, you are impatient." Lin Dong said as he put the tree pattern into the Qiankun bag.

"In the Lower Demon Rock Dynasty Li Pan, what happened just now was just a misunderstanding." The black shadow stood up, wiped the blood stains from the corners of his mouth, and stared at Lin Dong like a ghost.

"Misunderstanding?" Lin Dong sneered.

"Our Demon Rock Dynasty is not comparable to the garbage high-level dynasties of the Xuanbing Dynasty and the Great Wu Dynasty, there are several strong people in the Nirvana Realm, and the senior brother has long been a strong man in the One-Yuan Nirvana Realm, ready to impact the Dual-Yuan Nirvana Realm, if you hand over the Heavenly Rune Spirit Tree, we can not bother with you, otherwise you will face our endless pursuit." Li Pan said sharply.

"It seems that you haven't understood your situation yet, and you dare to threaten me at this time." Lin Dong said coldly.

"Brother Lin Mu, this person is so annoying." Qingtan frowned.

"Don't worry, he will never leave this stone chamber alive today." Lin Mu said indifferently.

"Boy, our Demon Rock Dynasty is not something you offended." Li Pan sensed Lin Dong's undisguised killing intent, and his heart began to panic.

"It's just a one-yuan nirvana realm, I don't care about it yet." Lin Dong sneered, and the momentum of the One-Yuan Nirvana Realm burst out and pressed towards Li Pan.

"You are also in the One-Yuan Nirvana Realm, how is this possible?" Li Pan said in horror.

"I will remember being so arrogant in my next life." Lin Dong said coldly.

As soon as the words fell, Li Pan flew away, but before he could take a few steps, Lin Dong's Celestial Crocodile's bone spear pierced his chest from behind him.

"Let's go find the Ancient Key." Lin Mu said lightly, the elixir in the stone room had almost been collected by them.

Lin Dong nodded, put away the Qiankun bag, and then threw Li Pan's body out with a flick of the spear.

At this time, there were already many people entering the stone hall, Lin Mu ignored them, and took Lin Dong and Qingtan towards the depths of the stone hall, there were some gains along the way, and some Nirvana Pills were piled up in some stone rooms, but these Nirvana Pills added up to only hundreds of thousands, which was just a drop in the bucket for Lin Mu.

After passing through several staggered corridors, Lin Mu and the three of them finally came to an extremely large main hall, which looked like a square.

They weren't the first to arrive at the main hall, three groups had already arrived at this time, but they were at a stalemate with each other, and who didn't make a move.

"Big brother, those four people are dressed the same as Li Pan, they should be in a group." Lin Dong took a look at the three groups, two of them were the Xuanbing Dynasty and the Great Wu Dynasty, while the other group of people only had four people, dressed the same as Li Pan just now.

"Cut the grass and eradicate the roots, and wait until they are solved." Lin Mu Road.

As they spoke, their eyes swept over the hall, and in the deepest part of the hall, there was a ball of light suspended, and in that cluster of light, there seemed to be a strangely shaped key-shaped thing.

Ancient Keys.

Almost everyone thought so, only Lin Mu knew that this was not an ancient key, but a bait, the key to open the mechanism of the main hall.

"You can go." Lin Mu said lightly.

"A little Heavenly Rune Master dares to be so arrogant in front of our Demon Rock Dynasty, you think too highly of yourself." Chen Tomb sneered.

"Xiaodong, I'll leave it to you." Lin Mu Road.

Lin Dong nodded, and then the figure swept out, Chen Tomb sneered, and with a wave of his hand, three half-step Nirvana Realm people behind him directly greeted him.

However, the three people of the half-step Nirvana Realm didn't even block Lin Dong's move, and they were blasted into a blood mist.