In the midst of lightning and flint, Tang Mubai took out his Tai Chi sword and stabbed it in the fourth corner.
The Tai Chi Sword is not a treasure, but it is better than a treasure.
The yin and yang energy contained in it is only much more than that of the three spiritual swords.
if……
"Clang~!"
A loud and melodious dull sound suddenly came out.
Tang Mubai, who was worried that the Tai Chi Sword could not replace the Spirit Sword, saw the huge scroll pattern in front of him, and it quickly swept away and disappeared.
Immediately afterwards, a portal really opened at the location of the original gate array pattern.
"call--"
The wind blew out of the open door.
The wind was mixed with dust and a trace of heat.
That's right, Tang Mubai felt the heat!
This heat continues to intensify and gradually transforms into a heat wave.
But the moment before it took shape, it suddenly dissipated and turned into wisps of cool breath floating in the air.
"Ouch~"
The "Jewel Dragon" came closer, growled low, and poked his head to walk into the open door.
"Whoosh! Whoosh! Whoosh!"
At this moment, streaks of silvery-white light suddenly lit up from inside the portal.
Swish swish swish~
Buzz~! Buzz~! Buzz~!
The air currents are swirling and the light is gathering.
Inside the portal, streaks of silvery-white light quickly formed into groups of white light.
Under the illumination of these light groups, the scene inside the door was clearly presented in the field of vision of Tang Mubai and "Gem Dragon".
"Ouch~"
The "Gem Dragon" was startled, its huge body stopped and stopped at the door.
Tang Mubai was completely fearless, and the "Sacred Heart Channel" did not indicate any danger, indicating that he was still in control of safety.
despair!
Lift your steps gently and walk into the door.
I glanced around and saw that dust was still swirling in the air, and even more was scattered on the ground.
Obviously, this spacious interior space has been closed for a long time.
In addition to dust, there are some incompletely weathered bones on the ground, including rusty weapons, collapsed stone platforms, and cracked walls.
All of this shows that there was a fierce battle here.
As for the final result, Tang Mubai didn't know.
Look around and finish scanning.
Tang Mubai's eyes fell on the corners and several formation patterns in the central area.
These formations are glowing, emitting silvery white light, illuminating the entire space.
The bright underground space is as big as a football field.
In addition to the four square formations in the central area, stone houses were built on both sides of the edge.
Through the open door panel of unknown material, there is also light coming from inside the stone house.
Tang Mubai was curious and walked over.
I randomly chose a stone house and entered, and at first sight I saw the source of the light.
A circular formation with not many lines!
Tang Mubai was quite familiar with this formation.
"Energy gathering array?"
Gather the energy of heaven and earth at one point, making it easier for warriors to absorb and refine it.
This kind of single room equipped with an "energy gathering array" has a popular name.
Training room!
It's not the practice room left by Tang Mubai's father, it's just a closed space with better sound insulation.
Real training rooms are equipped with "energy gathering arrays".
The martial artist only needs to sit cross-legged on the "energy gathering array" and perform martial arts.
The speed of condensing Qi and blood is faster than absorbing the energy of heaven and earth outside, or swallowing Qi and blood pills, ferocious beast meat, or ordinary elixirs!
As far as Tang Mubai knows.
Even if it is the lowest level "energy gathering array", if a warrior sits on it and practices for one day, it is worth ten days for others to practice outside!
Those big forces that train disciples basically have training rooms.
Tang Mubai carefully identified the "energy gathering array" in the stone room in front of him and determined that it was an intermediate level.
Although it is not high-end, it operates very fast. Just after Tang Mubai came in, the energy generated was already comparable to some special areas.
If the "energy gathering array" is allowed to operate, the energy generated will only increase and increase!
As for such training rooms, Tang Mubai just took a cursory glance at them, and there were nearly forty of them!
"So, this place is not a treasure house, but a training ground? A group training room for training disciples?"
After clarifying his thoughts, Tang Mubai was a little happy and a little disappointed at the same time.
The formation to open the entrance is so difficult, but the inside is just a training room.
Is the boss who created this underground space so willful?
Tang Mubai sighed, somewhat unwilling to do so.
In order to crack the formation, he went to the fifty-ninth domain to learn the formation.
As a result, after opening the entrance, I only got a training room and no treasures. I couldn't bear to accept it!
After walking out of the stone house, Tang Mubai carefully scanned the huge underground space, hoping to find treasures hidden in relatively hidden places.
Unfortunately, I scanned the entire underground space several times and couldn't find it.
"Sacred Heart" also did not prompt, which shows that there is really no treasure here!
There was a stairway sloping downward, and Tang Mubai found it in the corner.
Go down the steps and arrive at the lower level. It turns out that there are also training rooms underneath.
The difference from the upper level is that there are more than a dozen training rooms on the lower level. The cool breath floating in the air is stronger. The "energy gathering array" arranged in each training room is larger and generates more energy.
That's not all.
After searching carefully in the second space, Tang Mubai once again found a staircase leading down!
Follow the steps to the third floor. Sure enough, there is also a training room on this floor.
The difference is that there are only three training rooms on this floor.
The "energy-gathering array" arranged in each practice room is an advanced array, and the energy concentration is higher, faster, and has more content!
The cool smell in the air is stronger than the two layers above.
However, the heat in the third layer of space has not completely dissipated and still remains.
Most people will not be able to bear it if they stay here for a long time.
Tang Mubai was not afraid. He activated his "temperature control" power and carefully sensed the source of the heat.
It turns out that all the heat comes from the ground!
The starting point of the "Energy Gathering Array", the source where the array patterns are connected, is also located underground!
"Geothermal power?"
Tang Mubai simulated all the array patterns in the three-dimensional space in his mind, connecting them together to form "energy gathering arrays".
It was confirmed that the source of all "energy gathering arrays" indeed comes from geothermal energy!
The unknown force, or the big boss, who opened up the third layer of space, established a training room here.
Not surprisingly, it is because this place has geothermal energy.
Underground thermal energy also belongs to the energy of heaven and earth, but after countless years of earth evolution, it has long been biased towards fire energy.
Dozens of training rooms in the three-story underground space have transformed the fire attribute energy into non-attribute energy through changes in formations.
after all.
The former is only suitable for practicing fire-attribute martial arts, but the latter can be absorbed by everyone!
Except...
"Huh? There is actually someone in this training room?"