An Linyuan returned to the tent and said to the elders:

"The castle natives did not agree to us entering the castle, but agreed that we could retreat under the castle walls."

"I am going to build the tunnel that is being excavated into the last line of defense. The tunnel width is expanded to 200 meters. The excavated earth and rocks are piled on the 200-meter open space between the tunnel and the castle, objectively helping the castle increase the castle thickness by 200 meters."

"Except for the high-level monks who fought and were on duty on the front line of earth and stone walls, all the others were devoted to the construction of the last line of defense."

"I communicate with the castle natives, who will assist us in building a tunnel defense pit system."

The earth position of the Blue Fist Formation is planned to dig up a layer of 200 meters thick earth and stone above the tunnel. The excavated earth and stone pile up in the area 200 meters in front of the castle wall, forming an earth and stone wall that is 200 meters wide and 200 meters high. The city wall of the castle is also increased to 300 meters accordingly, which is 100 meters higher than the earth and stone wall outside the city wall.

"This will be the last line of defense." An Linyuan sighed when he saw the spectacular city wall design drawings.

The 12th wave of beast tide is surging. The "Tornado Attack" has a worse effect on the mental power attack of beasts than the 11th wave of beast tide.

The beasts rushed to the earth and stone walls and were still alive. The earth and stone walls that were hundreds of meters thick collapsed under the impact of the beasts. The beasts raised their heads and slapped their claws, and hit their bodies... The earth and stone walls were destroyed and broken in just a few hours.

A large number of monks who fought against the beast tide on the earth and stone wall were killed and swallowed countless beasts.

Some beasts broke into the earth and stone walls and broke into the army formation that dug the tunnel, turning the army upside down. The soldiers who dug the earth and stones in the tunnel lowered the realm of 2 to 3 major realms of ​​the beasts, and they were not the opponents of the beasts. All the low-level monks and farmers who came into contact with the beasts filled the belly of the beasts.

The "Tornado Attack" finally absorbed all the mental power of the beast. The 12th batch of beasts fell to the ground due to the loss of mental power.

"In addition to the army that built the last earth and stone wall, the other monks who participated in the war harvested beast materials."

An Linyuan also joined the queue for harvesting beast materials.

An Linyuan's way of harvesting beasts is relatively rough. In the area covered by mental power, he uses mental power to directly store the entire beast's corpse in the space ball storage space, so the collection speed is extremely fast.

Basically, the monks who are quick to fight can harvest the corpses of two beasts, while those who are slow to harvest can only harvest one beast. The rest are all collected into the space ball storage space by An Linyuan.

After harvesting the beast materials, An Linyuan went to the army warehouse to collect all the materials obtained from the beast tide they had collected before into the space ball storage space, and ordered the entire army to retreat after the tunnel.

When the Western Expedition Army fought desperately with the 12th wave of beasts, the Blue Fist Formation first raised the castle wall to 300 meters. At the same time, eight prismatic plateaus 200 meters high were built outside the castle wall as a position for the Western Expedition Army to support the far-fire support of the Western Expedition Army.

Before the 13th wave of beasts attacked, the earth and rock areas on the tunnel were barely dug to 200 meters wide, and the average depth was only about 150 meters.

"It's too late to go, all retreat. All the Far Fire equipment is moved to the newly built prismatic platform outside the castle wall."

The elders made the final struggle. In fact, when dealing with the 13th wave of beasts, Yuanhuo was no longer threatening, and he only laughed. But the elders still took it seriously and tried their best to supervise the transfer work.

There are only two weeks left before the end of the trial. An Linyuan stood on a prism-shaped platform and looked at the last battlefield in front of him.

In front of the earth and stone wall with an average height of more than 100 meters high is a trench with an average depth of 150 meters and a width of 200 meters.

Multiple major formations of defense formations, killing formations, and psychedelic formations are set up in the trench. From the perspective of the beast, there is a plain river in the trench.

"I wonder if this trench can land the 13th wave of beasts." An Linyuan pondered and looked further away.

The earth and stone walls that were originally in the Western Expedition Army's fight against the beast tide were broken, with gaps everywhere, and the remaining earth and stone walls stood there alone, proving that they had been a majestic defensive wall before.

The upper limit of the effective effect of "Tornado Attack" to absorb mental power is the Bronze Realm. Although it can also produce effects for the state above the Bronze Realm, the speed of absorbing mental power is reduced sharply. It is difficult to absorb all the opponent's mental power in a short period of time.

An Linyuan estimated the time it would take to suck the next wave of beasts' mental power, which would take about ten hours.

"Since you can't defend it, it's a way to increase obstacles and block the attack of beasts."

An Linyuan controls the Blue Fist Formation and uses the "earth wall barrier" skill of the earth formation. The Blue Fist Formation has been fighting every day for nearly 10 years during the trial, and the overall average realm has been increased by 2 small levels. Most of the Blue Fist Formation members have broken through to enter the bronze realm.

Under the control of the bronze realm, the "earth wall barrier" of the earth position has been upgraded to "stone wall barrier".

The "Stone Wall Barrier" is used to build stone walls very fast. An Linyuan controlled the Blue Fist Array and built a stone wall of 100 meters wide and 20 meters high every 100 meters in the 3-kilometer-wide area where the Western Expedition Army was stationed, and 15 stone walls were built!

"I hope these 15 stone walls can block the beast tide until their mental power is sucked dry by the tornado."

The 13th wave of beast tide surged. The way forward of the beast tide was no longer stopped, and the beasts wanted to destroy the stone walls that blocked them from hitting the road.

The Western Expedition Army suffered heavy losses during the last wave of beast attacks, leaving only more than 200,000. Seeing the beasts that were so high that they could not recognize again, their calves were already trembling.

In just a few hours, a beast had broken through 15 stone walls and arrived at the tunnel area.

The beast saw a flat horse in front of him, roared and rushed forward. Then it disappeared.

The beasts fell in rows of places in the tunnel area, fell down the tunnel pit, fell into the killing array arranged in the tunnel, and were strangled.

The space inside the tunnel pit is small, and beasts are rushing around, and huge tremors can be felt on the ground.

The beasts kept falling down, and the newly falling beasts pressed on the beasts falling in front, crushing many beasts to death. Those who were not crushed to death were also killed in the killing formation.

A week later, the 13th wave of beast tide subsided.

An Linyuan put all the corpses of beasts covered by his mental power into the space ball storage space. The tunnel pit was cleared again.

The mechanism originally arranged in the tunnel has been completely destroyed by the beasts, and the gray spirit stone buried in An Linyuan was exposed.

"Two guards led high-level monks of the Western Expedition Army to the tunnel to collect energy spirit stone treasures." An Linyuan ordered in the new tent on the prismatic platform.

The army of the Western Expedition was extremely fast.

"A total of 400 billion energy spirit stones were harvested in the treasure tunnel." The two guards reported the treasure data.
Chapter completed!