When he was secretly on the top of the cliff before, Chen Yuan was thinking about the strange situation in front of him while paying attention to the nearby terrain.

Although the troops of the human race and the elf race are defeated, it is not a problem to retreat, after all, the most critical 'source of life' has been obtained, but at this time, even if the situation is at a disadvantage, the troops of the two races are still fighting and retreating, and they must destroy all the 'pollution demons', Chen Yuan guessed that it was only because of the sudden appearance of unknown reasons that the two clans must destroy these invading black abyss monsters.

But here's the problem, the human race and the elf race are not only inferior in numbers, but the situation is also developing in a one-sided direction, and the reckless will definitely not be able to win. Chen Yuan wanted to complete this mission, so he had to use strange tricks to win.

The rift at the bottom of the cliff was just one of the many rifts leading to the depths of the Great Elwin Forest, but as long as there was a rift, there would always be an exit, and Chen Yuan easily found the exit on the other side of the rift valley from a high place.

The location of the exit was not far from the position of the friendly troops, and in the two minutes that Chen Yuan had delayed, it was enough for everyone to retreat to the exit and start arranging the favorable terrain.

The 'Pollution Demons' are not very fast, which is why the forces of the two clans can continue to maintain the situation even if they are at a great disadvantage.

Although the cavalry has been trying to slow down the movement of the 'Tainted Demons' in order to facilitate the killing of ranged units in the rear, the combination of negative status and the huge disadvantage in numbers make the delay ineffective.

The lack of flexibility of the cavalry was magnified by the narrow terrain, in which even if the battle was carried out with great care, the battle losses were not small.

This situation will not last long, and it will collapse because all the troops in the front row are killed, so Chen Yuan must avoid this situation.

Chen Yuan's plan is very simple, since there are many people on the opposite side and few people on our side, it will definitely be difficult to resist the attack of the opposite side, and the narrow terrain is not conducive to us. Then simply completely destroy the terrain factor, and use positional warfare in a more narrow area to mitigate the impact of the difference in numbers between the two sides.

At this time, nine mentor-level plus one quasi-legendary-level full ten mages stood in front of Taniguchi, regardless of whether they were good at earth-based magic or not, and they all raised their wands in their hands.

As the ground shook violently and continued to make loud noises, the terrain of the entire valley mouth began to change, and the cliffs on both sides began to converge, and the rock formations grew into a large number of platforms under the effect of magic. On the other hand, several cracks were squeezed out of the valley crossing below, and the falling rocks began to rise and rise.

In a short time, the terrain was transformed.

The new valley crossing is extremely elongated and fan-shaped and gradually widens. At its narrowest point, it was only wide enough for 10 people, and the ground near the exit was also heaved by the contraction of the terrain, forming a slope towards the ground in the valley, which was a lot higher than in the rift. Coupled with the large number of platforms on the rock walls on both sides, the favorable terrain planned by Chen Yuan has been built.

After the Earth Dragon Knights quickly leveled out the irregular trampling on the bulging terrain, all the more than three hundred knights jumped off their mounts, of which nearly forty knights knelt in a semicircle and set up their shields in front of them, and the same number of knights stood and put their shields on the shields of their companions in front, forming the first layer of defense. Then, with the same numbers and formations, the second, third, and even fourth layers of defense were also in position, ready to take over when the companions on the upper floor were ready to retreat and heal.

On either side of the cliffs, a group of six Forest Elf archers are ready to rain fire on a protruding firing platform. There are also several platforms where archers and mages from the Warcasters are standing, also ready to go.

As for the other melee fighters and the Knights, the Ground Dragons began to march up the cliff face along the path on either side, silently with the help of the 'Cloak of Shadows'.

Chen Yuan stood at the forefront of the first layer of defense.

He had tried before, and the 'Ten Directions Gomori' moved the shield behind him forward, and if all the shields were spread out in a semicircle, the widest defensive distance would be exactly about ten meters.

At this time, the valley mouth, which can accommodate twenty people, is the best terrain for Chen Yuan to exert his group defense ability.

When the knight in the gap in the shield protection is unable to bear it, the knight of the same defense layer protected by the invisible shield next to him will take over the defense, and then withdraw to the last side for healing. At the same time, the knights in the same position on the second layer of defense will also fill the gap of the replacement, and the layers will also take turns to take over the defense in this way.

The knight who is healed at the end will also form the same defensive formation after the heal, forming a defensive loop with the knight in front of them.

.....

The shaking of the ground heralded the approach of the 'Pollution Demon' army, and not far away, more and more 'Pollution Demon' army began to appear in everyone's field of vision.

In the face of the approaching army, everyone's momentum is no longer as low as when Chen Yuan first saw it, whether it is the Earth Dragon Knights, the Forest Elf troops, or the fighters, their eyes reveal the courage to die.

The favorable terrain and perfect layout not only gave everyone the capital to fight against the army of 'Pollution Demons', but also gave the hearts of all those who were shrouded in despair the hope of winning.

Even a little spark of hope is enough!

The ignition of momentum has undoubtedly greatly improved the cohesion and combat effectiveness of all soldiers.

The first wave of sulfuric acid spews after the 'Pollution Demon' approached was easily dissolved under the connected shield array.

The narrower terrain and the disadvantage of being located in a low position meant that only a dozen or so Pollution Demons at the front could hit the shield circle's defensive circle.

And the light on the shields of the knights has long been connected, and the defensive power of the light curtain forged is far stronger than that of the previous scattered fight.

Block, attack, block, attack, retreat to replace, look for healing, and set up again.

With the help of an orderly defensive rhythm and a small terrain, the alternating alternation of the four layers of defense successfully withstood the onslaught of the 'Pollution Demon' army.

The encouraged long-range on the cliff wall also played harder, and everyone had excitement on their faces.

After all, it was just a disgraced beating, and now it is natural to fight to the death if it can be returned.

"Lux, that John, how much do you know about him?"

"I'm sorry, teacher, Senna and I just met Mr. John last night, and we didn't know much about him."

"Really..... It's just that a rookie who has just entered the official battle position has this kind of strength and brains, if nothing else, Bai Xiao Kingdom, I'm afraid that there will be another 'legendary' defender. If you can win him over, hurry up, not only for yourself, but also for the current situation in the royal capital. ”

“..... Well. ”

Chen Yuan didn't hear the discussion of the teachers and students above him, and his attention was all focused on the black wave in front of him.

It seems that countless 'pollution demons' are impacting the defense circle over and over again, and Chen Yuan's experience is also growing little by little.

Although Chen Yuan did not kill any of the 'Pollution Demons', the system seems to determine that he and the surrounding knights are in a friendly state of teaming, and all the 'Pollution Demons' killed by the knights provide Chen Yuan with an ally experience, although it is not much, but the huge number still brings rich benefits.

Just now, Chen Yuan's level was increased from LV.7 to LV.10, and while obtaining a little attribute point, Chen Yuan opened the system without saying a word and directly chose to be promoted.

Seeing that the 'Shield Spirit' in the rank column on the attribute bar panel gradually changed into the 'Shield Armor Guard', and the bonuses provided also increased a lot, Chen Yuan swept the specialty column and skill column at the bottom, and sure enough, the proficiency of all specialties and skills was also steadily improving.