The Witcher: Son of the Planes.

Colin observed the warriors coming out of the camps. In addition to the elemental wizards and knights that Colin saw most, there were also some highly modified mechanical wizards? Colin was a little unsure. In addition, there were a small number of warlocks and some races from other worlds.

There are thousands of passages in the underground world, and each layer has many entrances. The countless layers below the third layer of the underground world are where the Abyss Demons live. The Abyss Demons is a unified name, but not a unified race.

Although the Abyss Demons are already part of the wizarding world, the brutality and destructiveness that come from their blood still affect them from time to time. When they are not attacking upwards, the underground world is open to them. People from various races of the Abyss Demons come to travel to various levels of the underground world from time to time, and some even appear on the surface world.

Although there are many races of abyss demons, they can be roughly divided into three categories. The first is the abyss dragon clan (that is, the part of the dragon bloodline that Colin absorbed), the second is the dark elf clan (the race of Akona that Colin met in the underground world), the third is the gray dwarf clan, and the fourth is the abyss demon clan of the original abyss world.

Every time an attack is launched on the third layer of the underground world, it is usually the Abyss Demons who take the lead, but later on, the other three tribes may also get involved.

Speaking of the underground abyss demon clan, after being localized in the wizard world, they have also become very different from the demons of the original abyss world in the long evolution. First of all, in the derivation of their offspring, they are no longer evolved from the demon worms born from the abyss Styx, but gradually evolved a reproductive system, and offspring are produced by the combination of demons.

Secondly, there are not as many types of demons as those in the original abyss world. It may be that some weak races have disappeared in the long-term war.

Finally, although the strength of the underground abyss demons has decreased, their thinking is no longer so confused, but has become much smarter.

The third layer of the underground world has been suppressing these abyss demons for a long time. Although they have the support of the first two layers of the underground, it is not enough if they rely on the third layer alone. In fact, all the major forces on the surface have provided assistance, but Colin did not know it before.

In fact, in the earliest times, there were no wizard towers in the underground world. Affected by the abyss world, the underground world was inevitably polluted during the invasion of the abyss will.

After destroying the abyss demons on the surface, all the major forces also wanted to launch a large-scale extermination campaign and continue to advance towards the lower levels.

But after many years of fighting, the war had to be stopped because there were too many passages below. After repeated division of troops, it was easy to be ambushed and defeated one by one. If the troops were not divided, the time spent would not be worth it. They had no choice but to accept the status quo. Thus, a three-story wizard tower was built to prevent the abyss demons from causing chaos.

Over the past few hundred years, this kind of war has also acquired special significance. For the Abyss Demon Clan, on the one hand, it consumes too many people, and on the other hand, it is a hidden thought in their hearts, hoping to break through the constraints of the three underground layers and attack the surface.

For the major forces in the wizarding world, in addition to preventing the abyss demons from causing chaos, it also serves the purpose of training troops. Such on-site teaching is no less than a plane war, and consumes more slave creatures mobilized from the occupied planes.

Such a war would be launched every few decades and would generally last for several years. When the Abyss Demons felt that the fight was almost over, they would symbolically ask for peace, and then the cycle would repeat itself.

After Colin arrived at the battlefield, the scene he saw was countless abyss demons swarming towards this side, and the warriors of various races who gathered there also went towards the abyss demons without fear.

The scale of the battlefield is indeed not small, and fighting is going on all the time. However, no matter where, the biggest losses are still suffered by the low-level combat forces. The wizard tower has a large number of slave creatures, as well as reinforcements from various major forces, so naturally the losses are not taken into account.

As for the Abyss Demons, the war had only started for a few years and had not yet achieved the goal of attrition, so naturally they did not consider any losses.

Colin watched for a long time and became a little bored. The Abyss Dragon Clan that he wanted to see the most did not seem to participate in the battle, at least not on his side of the battlefield.

As for the forces on the Wizard Tower's side, the bottom-level ones are naturally needless to say, with endless slave legions fighting forward involuntarily. The middle-level combat power comes from the volunteers of various races and the support of major forces. As for the high-level combat power, it is mainly composed of the personnel trained by the Wizard Tower on the third floor of the underground world.

Colin felt that there was really not much difference between the war here and the war in the other planes. His gains, apart from what he gained from the contract, were the spoils of war.

Well, these underground abyss demons can definitely increase our experimental specimens.

Now that he had understood everything, Colin naturally prepared to return to the camp. It would be half a month before he came here again.

……

Colin returned to the camp and soon received a message that there would be an internal exchange meeting held in the camp tomorrow, and those who were interested could participate.

Colin had nothing to do, so he thought it would be a good idea to take a look, hoping there might be something he needed.

The next day, following the message, Colin easily found the place where the exchange meeting was held. It turned out to be a small exchange meeting. The organizer was actually the wizard Gareth, and it was aimed at professionals above level one. This made Colin feel relieved.

Colin had participated in this kind of exchange meeting many times. Under the chairmanship of Gareth, the exchange meeting was held in an orderly manner. Colin looked at the items taken out by the people in front of him, and he was not very interested.

Some items were useless to Colin, some were also owned by Colin, but the majority were abyss demons, some alive and some specimens. These things could be obtained by himself after a while, so Colin would naturally not waste money on buying them.

It wasn't until a wizard showed up and took out his item for trade that Colin became interested.

"This is a book about how to stimulate the growth of spiritual power. I spent a lot of effort to get it. I hope to exchange it for the Leaf of Life. If anyone is willing to exchange, it can be done now."

After saying this, he looked at the professionals present, waiting for someone to propose an exchange.

After he finished speaking, not only Colin, but everyone present became jealous. Since they had embarked on the path to transcendence, who wouldn't want to go further? Even those knights looked very interested. It would be great whether they could use it themselves or sell it to others at a higher price.

He chose to exchange for the Leaf of Life, but it looked like no one had it. However, seeing everyone whispering, someone must have talked to him silently. However, Colin didn't know what others had taken out.

Although he might be able to provide a dictation copy, Colin did not want to fall behind, so he also expressed his intention to exchange with him.

The exchange plan Colin could offer was the Clone Technique plus the Fountain of Life plus Wizard Coins. After he sent the message, he waited for the other party's decision.

The wizard pondered and was still weighing the pros and cons. These items were good, but not what he wanted most. Only the Fountain of Life provided by the wizard named Colin was somewhat helpful, but it was far from enough. He didn't have much time left, and even if he had a way to stimulate his mental strength, he might not be able to survive until the time of advancement.

In the end, he chose to talk to Colin again after the exchange meeting.

After receiving the reply, Colin felt that he was one step closer to the book. He waited patiently for other wizards to take turns showing their exchange items.

When it was Colin's turn, he casually released some blue-blooded slaves and orc slaves in exchange, and when a wizard offered items of equivalent value, Colin exchanged them.

Finally, the small exchange meeting ended. Some people were smiling, while others were silent. Here, with the strong suppression of the three-story wizard tower, there would not be any blind people who would do something disgusting to everyone for the time being.

After the exchange, Colin and the wizard naturally came together spontaneously to discuss how to conduct the exchange.