The Witcher: Son of the Planes.

Colin and the wizard named Od did not hide anything and finally arrived at the residence of Wizard Od. According to Od, he did not have much time left, and even if he had mastered the method to stimulate the accelerated growth of mental power, he might not be able to catch up, so he sold this book.

"Wizard Oude, excuse me for saying so much, but the Leaf of Life you want is probably hard to buy even on the surface, let alone in the third level of the underground world. It must be picked from the Tree of Life on the Elf Plane. Do you think ordinary people would have this opportunity? Even if there is, wouldn't he use it himself?" Colin said.

"Oh, I am a little too hopeful, but other than the Leaf of Life, other things can hardly increase my lifespan in a short period of time. I know you have the Fountain of Life, but its effect is very ordinary. Maybe it is good for mortals, but it is not good enough for us wizards." Ode said with some disappointment.

"I have no intention of prying into your privacy, but I feel that you should still have a few decades to live. Coupled with the effect of the Fountain of Life, perhaps you can find another way in these decades, or you may succeed in advancing." Colin persuaded patiently.

"Hey, you're very accurate. My aptitude is very average. I'm already over 400 years old. If I don't advance in the next few decades, I'll gradually get old. Now is urgent. If you can't find the Leaf of Life, I can only return the rubbing to you." Ou De said after thinking for a while.

"Hey, there really is a rubbing." Colin thought.

"A rubbing is fine, but how can we ensure that it is exactly the same as the original?" Colin asked.

"This is simple. It is proved by the will of the plane. I can also let you watch the original version. It will not affect your learning of this method."

"Okay, I'll change. The Fountain of Life is most effective the first time it's used. It can generally extend your lifespan by about ten years. Subsequent uses will continue to sharply decrease until the effect disappears, so I'm going to exchange 5 drops for you. Since you're not going to give me the original, I can only add the Clone Technique, and I won't pay you with wizard coins." Colin thought for a while and said.

"Alright, I agree to the exchange."

Under the witness of the will of the plane, the two swore an oath together, using the integrity of the book as the original oath. After the oath, the two exchanged rubbings of the book. At the same time, Colin also paid 5 drops of the Fountain of Life to Wizard Ode, and the exchange was completed.

After the exchange was completed, Colin left Ode's residence and returned to his own side. Although he did not deliberately remember the original just now, there was no difference between the two, not to mention the supervision of the plane's will.

The rubbing copy in Colin's hand was already prepared by Ode. It seemed that he had a plan in place. If there was a suitable one, he would exchange it for the original and keep the rubbing copy. If not, he would give the rubbing copy in exchange for some of the things he needed.

The rubbing copy is not thick, or rather very thin, and does not contain much content, but it looks very effective. It requires finding a kind of winter primrose as the main ingredient, and adding some other common magic plants as auxiliary ingredients, to refine it into a medicine called manganese heart potion for consumption.

Similar to other common medicines, the effect is best the first time it is used and then gradually decreases, but there is one advantage, which is that the side effects are extremely small.

Well, if there are any more side effects, Colin might as well just take the advanced mental potion.

Now that I am on the third level of the underground world, I can’t find the winter primrose for the time being. I can only wait until I return to the surface. I believe that since Ode can find it, I should be able to do it too.

Having solved another big problem, Colin was in a good mood. He felt that this trip underground was a good decision. He prepared to go back and improve his mental strength after finishing the contract signed with the wizard tower on the first underground floor.

……

It was a lot of time, especially more than ten days was not enough for Colin to complete an experiment.

On this day, Colin and his camp finally went out to fight.

In addition to the dozens of people who followed Daraben to this camp these days, there are also dozens of people brought here by others one after another, and there are more than 200 people originally in the camp. A total of more than 300 people constitute the middle and high-level combat power of the camp. The accompanying slave army is generally released only when they arrive near the battlefield.

Just like what Colin saw more than ten days ago, the team of more than 300 people continued to merge with the fighters from other camps on the way to the battlefield, gradually gathering into a mid- and high-level combat force of tens of thousands of people, supported by hundreds of thousands of slave creatures, and attacked the battlefield in a mighty manner.

After arriving at the battlefield, the fight started immediately. The retreating friendly forces spontaneously went around to the back, waiting for the next battle.

Colin solved a big problem, so he naturally had a detached mentality. He thought of completing the task in a few years, and he did not stand out or fall behind, but cast his familiar spells steadily.

When he sees the right opportunity, Colin will capture some abyss demons alive and use them as specimens for future experiments.

Colin was enjoying the fight, but the abyss demon on the opposite side was a little unhappy. What? Do you look down on us abyss demons?

As the fight went on, Colin was targeted by a Balrog on the opposite side. At first, Colin didn't realize he was being targeted, and he felt annoyed. It was only after Dixing's reminder that he saw the Balrog that was attacking him.

According to Colin's understanding before the battle, the Balrog has two main types of spells. One is mind control, which is a kind of soul spell. The one that attacked Colin just now should be this one. The other is firestorm. There is nothing much to say about this one. It has a similar effect to the fire spells that Colin has mastered.

"If the tiger doesn't show its power, people will think I'm a sick cat." Colin's anger was also aroused, and then he slashed at me with a dimensional slash.

The Balrog's battle sense was also very sensitive. He raised the flaming whip in his hand and swung it over, colliding perfectly with the Dimension Slash.

The power of Dimension Slash was still a little small, and its main feature was concealment. Seeing that his intention was discovered, Colin switched to his strongest Lava Purgatory.

While the Lava Purgatory was being cast, the Balrog on the opposite side felt the intensity of the flames. The human wizard on the opposite side was actually a fire wizard, and he was not to be outdone and released a fire storm.

The collision of fire is bound to be the strong side absorbing the weak side. What surprised Colin was that the lava purgatory that had been invincible in the past seemed to have been weakened a lot. Although it forced its way through the fire storm, its subsequent power was much smaller and was beaten away by the flame whip of the Balrog.

Fortunately, unlike Colin's witchcraft, Balrog's spells can be cast infinitely as long as there is enough mana. His spells are limited in the number of times they can be cast each day. Colin plans to use Lava Purgatory to offset Balrog's spells before considering how to defeat him.