The Witcher: Son of the Planes.

The battle scene between Colin and Balrog was magnificent, with sparks of fire flying everywhere and colorful scenes. After Colin's mana was depleted to three-fifths, Balrog could no longer cast any spells.

However, the Balor Flame Demon who does not use spells is definitely the backbone of the Abyss Demon Clan. With a strong physique, good magic resistance, and skilled whip combat skills, he is still a powerful existence among the first-level professionals.

There was no need to engage in magic confrontation. The Balrog naturally swung his flaming whip towards Colin, and Colin naturally used spatial displacement to avoid the Balrog's attack.

Since he had painstakingly studied space magic, Colin had acquired many more means of fighting the enemies. After Colin dodged, he cast a spell again, using the clone spell to confuse the Balrog, and then a quagmire swamp was cast towards the Balrog's feet.

The Balrog swung his flaming whip again, but it only hit Colin's clone. The clone dissipated under the Balrog's attack, but it also gave Colin a good opportunity to use his witchcraft.

The Balrog's feet twisted and he almost slipped, then his movement speed dropped sharply. Since Colin could perform spatial displacement, the Balrog's speed increased while his speed decreased. It was basically impossible for the Balrog to hit Colin, and Colin kept hurting the Balrog with slow movements.

Balor the Fire Demon felt a little aggrieved. "Damn! Human wizards are so cunning. When they can't win, they resort to such despicable means. If they have the guts, they should just stand up and fight honestly."

Colin has grown from a slave to today and has experienced countless battles. No matter what method you use, as long as it works, history is always written by the victors. If you are dead, what's the point of being powerful?

Balrog looked helplessly at his companions around him. Each of them had his own opponent and no one had any spare time to help him. Until now, he had the first thought of escaping. Wizards were indeed the masters of the wizarding world. Balrog kept retreating, trying to withdraw from the range of the quagmire swamp.

Naturally, Colin would not give him this opportunity. He would take time to replenish the coverage of his spells. Later on, Colin's mana was almost exhausted. With no other choice, he could only drink a bottle of mana potion and continue to fight against the Balrog.

Let's see who will give up first, or the Balor Flame Demon.

It can only be said that Colin's luck once again determined the outcome of the battle. After such a long battle, Balor was actually a little dazed. Colin's dimensional slash actually penetrated Balor's flaming whip and cut his arm fiercely.

Balrog's arm was cut in half, leaving only a trace of flesh and blood, and he had to switch the flame whip to his other hand.

While Balrog was changing to his flame whip, Colin seized the opportunity and released the Dimension Slash again, aiming directly at the wound and perfectly cutting off one of Balrog's arms.

In the following period of time, Colin continued to attack the side of Balrog's broken arm, and the injury on this side became more and more serious, until Balrog was hit by a dimensional cut in the abdomen. Balrog could no longer hold on, and he fell to the ground in pain.

"Surrender, if you become my subordinate, I will allow you to live." Colin advised after seeing that the Balrog had lost most of its mobility.

"Don't even think about it, you despicable human wizard, do you dare to remove the spell under your feet and fight face to face?"

"...Did you not sleep well last night? What were you talking in your sleep? I'll ask you one last time. If you don't surrender, you'll become my specimen." The battlefield was changing rapidly, and Colin didn't want to waste time arguing with him.

"Damn it, come on, the Balrog who hasn't surrendered yet is born." Balrog struggled to stand up again, endured the severe pain, and swung the flaming whip towards Colin again.

"You're pretty tough. Let's see how tough you are after you become a specimen." Colin said nothing more and continued to inflict new wounds on the Balrog according to his previous fighting style. After cutting off his other arm again, the Balrog was already dying.

However, before he died, Colin stepped forward and forcibly controlled the Balrog, sealing off his ability to move and putting him into a different dimension.

This was Colin's most valuable trophy on the battlefield. The subsequent battles were much milder. Colin casually harvested those low- and medium-level abyss demons until the next day.

The next day, a new group of friendly troops arrived at the battlefield, and Colin and others were able to withdraw safely. The next battle would be twenty days later.

……

The contract Colin signed with the first level of the underground world was for five years. After Colin got used to the battle rhythm of the third level underground, he gained something in every battle in the following years.

Not only that, he also used the intervals between battles to refine the blood of a lot of abyss demons.

Although their subsequent evolutionary directions were different, and after being integrated into the wizarding world and localized, they evolved a reproductive system, but their common roots from the abyss worms still influence the abyss demons in these wizarding worlds.

Colin can feel the power of the devil. If it was before he was promoted to the next level, Colin might have considered whether to integrate into the devil's bloodline, but now Colin's direction has been determined and he will not change it easily.

However, he preserved the extracted bloodlines and can pass them on to his descendants. It is said that there are families among warlocks that specialize in demonic power, but Colin has only heard of it and has not seen it, so he has no idea what specific power it has.

After the last battle, Colin's contract in the underground world was completed. During this period, Colin only saw Dara Beng twice. According to him, it was because his potential was exhausted and he just wanted to serve the first-level wizard tower safely, so he never fought once and the tasks he did were all of this auxiliary nature.

Although Ode's life span is not long, after taking Colin's Fountain of Life, he still looks younger than before. His contract with Colin is different, and he still has three years to go. He can only watch with envy as Colin leaves, hoping that he can buy a treasure that can increase his life span again in his lifetime.

Colin's return journey is naturally risk-free. The war between the underground world and the abyss demons has reached a fever pitch. However, since the abyss dragons have not participated in the war, Colin has no expectations and can only leave it for later.

After returning to Megwen City, he reported to Teacher Lina immediately. This time, Lina said that Colin would not leave Megwen City again and needed him to wait for the task arrangements of the Heaton Family at any time.

Colin naturally appreciated teacher Lina's preferential treatment, and he would strictly abide by the teacher's requirements. Moreover, he had a premonition that the Heaton family was in an upward stage. After winning the last battle in the Acacia Plane and digesting the gains, they would naturally launch a new plane war.

While waiting for the Heaton family to assign him a task, Colin bought all the materials for the manganese heart potion. It didn't cost much, and Colin began to try to refine it. After years of alchemical experiments, Colin had quite a bit of experience in refining. After failing several times, he finally succeeded.