At this moment, Wang Daoyuan felt that his whole body was abnormally hot.
The Earth Vein Spirit Milk was born by the magma lake and absorbed a large amount of fire attribute spiritual energy, causing the five elements spiritual energy to be out of balance.
He continued to use his cultivation method and used half a cup of tea's time to condense the excess spiritual energy into True Essence, which slightly improved his cultivation.
He estimated that if he took the entire drop of Earth Vein Spirit Milk, he could directly break through to the fourth level of Foundation Establishment.
However, the heat in his body did not recede, but instead became more intense.
He only took one-tenth of a drop of Earth Vein Spirit Milk, and the side effect was so severe.
If he directly took the entire drop of Earth Vein Spirit Milk, he would probably be burned to death.
After another quarter of an hour, the heat turned into a burning sensation, and he felt that his whole body was about to burn up.
He could not suppress it even when he used his water attribute spiritual energy.
After being tortured for half a day, he took out a Mysterious Yin Jade Gourd from the space and forcibly refined the Yin Qi to suppress the burning sensation.
After refining the Yin Qi, a cool feeling spread from his Dantian to his meridians, and the burning sensation was significantly reduced.
Wang Daoyuan continued to refine the Yin Qi, consuming five gourds of Yin Qi to completely dissolve the burning sensation.
Although the Yin Qi was harmful to the body, it was still spiritual energy.
The Yin Qi and the fire attribute spiritual energy in the Earth Vein Spirit Milk dissolved each other, and his body did not suffer much damage.
On the contrary, because he refined a large amount of spiritual energy, his cultivation improved a lot, and he could already try to break through to the fourth level of Foundation Establishment.
He did not take any more Earth Vein Spirit Milk to try to break through.
Instead, he carefully put away the remaining Earth Vein Spirit Milk, which was used to resist the Yin Qi of the Gui Water Nether Spring.
When he was near the Gui Water Nether Spring, if the Yin Qi was too strong and he could not resist it with his spiritual energy, he could take some Earth Vein Spirit Milk.
He could use the fire attribute spiritual energy in the Earth Vein Spirit Milk to resist the corrosion of the Yin Qi.
After taking away all the Earth Vein Spirit Milk, he did not touch the stalactite that produced it.
Even if he cut it off and took it away, it was worthless.
Without the support of the entire spirit vein, the stalactite could not produce Earth Vein Spirit Milk in the space of the spirit pearl.
He left the space and used the Earth Wall Technique to seal the passage, maintaining the environment that produced the Earth Vein Spirit Milk.
In the northern part of the mountain, the depth of the underground magma was usually about eighty thousand feet below the ground.
Therefore, the depth of Wang Daoyuan's current location should be around 80,000 feet.
According to Five Elements Daoist's records, the Gui Water Nether Spring was more than seven thousand feet underground.
At this time, the place he was at was already lower than the Gui Water Nether Spring.
It was not very reliable to dig a hole close to the magma.
To dig to the Gui Water Nether Spring, it was better to dig from a similar depth.
After advancing several hundred feet upward, he took out the Spirit Seeking Compass and determined the direction.
The Spirit Seeking Compass and the Formation Measuring Compass were both developed from the foundation of the compass. Determining direction was a basic function, but this function was not usually used.
The Tenth Water Spirit Spring was directly north of him. After using the Spirit Seeking Compass to find the north direction, he released the Soul Chasing Bees to find a passage extending north.
With the help of the karst cave, he could get as close as possible to the place where the Gui Water Nether Spring was located and shorten the digging distance, which could save a lot of effort.
With the help of the soul-chasing bees, it took him more than a month to move north for over six hundred miles.
During this process, he encountered many second rank demonic beasts.
With the warning of the soul-chasing bees, he successfully avoided them and did not have any conflicts.
Finally, he reached the northern edge of the karst cave.
Further north, there were no more karst caves.
It should be more than three hundred miles away from the location of the Gui Water Nether Spring.
This distance could only be covered by digging slowly.
Before starting to dig, he first used the Spirit Seeking Compass to detect the situation in the rock formation ahead.
If he dug directly, encountering demonic beasts living underground would not be a big problem.
If he encountered an underground water vein, the water would rush in and the huge water pressure could instantly kill him.
After probing for a while, within five hundred feet, there were no demonic beasts or underground water veins. Only then did he feel relieved to start digging.
Of course, his digging was not like mining, where he dug forward bit by bit. Instead, he directly released the Dust Returning Flame to burn the rock wall.
Some rocks burned by the Dust Returning Flame would produce a large amount of earth attribute spirit qi, which could support the burning of the Dust Returning Flame.
In this case, Wang Daoyuan only needed to use a small amount of spirit qi and spiritual sense to control the direction of the Dust Returning Flame, and the forward speed was very fast.
Some rocks, after being ignited by the Dust Returning Flame, produced less earth attribute spirit qi, which required him to consume a large amount of spirit qi and spiritual sense to maintain the burning of the Dust Returning Flame.
In this case, he needed to stop frequently to recover his spirit qi and spiritual sense, and the speed of his advance was greatly reduced.
In this half year, he had advanced a little more than eighteen miles to the north. On average, he could advance about one mile every ten days.
One day, a year later, Wang Daoyuan used the Spirit Seeking Compass to detect the situation inside the rock wall and found a small hole the size of an adult's arm more than two hundred feet in front of him.
The small hole was continuous and curved, very much like a mouse hole.
Other than that, he did not find any demonic beasts or underground water veins.
Wang Daoyuan did not take a detour, but continued to push forward.
These small holes were very useful. When he used the Dust Returning Flame to burn the rock wall, the flame could enter the small hole and burn the rock wall inside and outside at the same time. It was much more efficient than burning the rock wall from the front.
More than ten days later, he had advanced more than two hundred feet. The small hole that he had detected earlier appeared in the rock wall.
His spiritual sense followed the small hole and probed inside. He did not find any living things, only a few long hairs.
The long hairs were grayish-black, and he could not be sure what kind of demonic beast left them behind.
There were obvious bite marks on the inner wall of the small hole.
Judging from the bite marks, the demonic beast that dug the small hole was most likely a mouse.
The remaining spirit qi on the long hairs showed that this demonic beast was not very strong, only a first-rank superior.
He had the Soul-Extinguishing Bell and the Vampiric Vine. No matter how many first-rank demonic beasts came, they would all die.
Especially in this narrow underground cave, they posed no threat to him, and he could use the cave to advance without worry.
With the help of the cave, the Dust Returning Flame burned the rock wall much faster. It could advance about one mile every five days, doubling the speed.
Of course, this was if the direction of the small hole was reliable.
If the direction of the small hole deviated from the direction he was advancing, it would not be of much use.
A month passed. When Wang Daoyuan used the Spirit Seeking Compass to probe the rock wall in front of him, he found traces of demonic beasts in the small hole for the first time.
Moreover, the place where the demonic beasts were more than a hundred feet away could not be called a small hole. There was a spacious cave there, and there were many mouse-type demonic beasts in the cave.
Wang Daoyuan was excited. If he could control this group of mouse-type demonic beasts and make them dig a suitable hole in the rock wall, he would be able to advance every five days every five days.
He would be able to maintain the speed of one kilometer every five days. In this way, he would only need a little more than four years to dig through a distance of about three hundred kilometers.
Since this group of mice could be so useful, he naturally could not let them go so easily.
He immediately advanced toward the group of mice. These mice were really bold. Instead of running away, they gathered together as if they were going to defend their home with their lives.
After Wang Daoyuan advanced to the group of mice, he finally saw them clearly.
They looked very similar to ordinary mice, with grayish-black fur.
The only difference between them and ordinary mice was that their two front teeth were silver-white, flickering with a cold light. This was a first-rank superior demonic beast, the Goldbiter Rat.
The Goldbiter Rat was usually a first-rank superior demonic beast. The king of the group could grow to a second-rank inferior demonic beast.
The Goldbiter Rat's combat strength was not much. Their only specialty was their two sharp front teeth.
Gnawing on hard rock and refining materials was their greatest pleasure.
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