The marking on Merlin's chest turned darker, just like a black mole. However, it gave off a cool aura as Darkness Elements had gathered at that area.

The Spell Models of Dark Mist and Dark Light Realm in Merlin's awareness had begun to absorb Magic Power at a quicker speed because Merlin had succeeded in cultivating Darkness Heart.

Darkness Heart attracted Darkness Elements by nature. Moreover, it could also enhance the power of Darkness-type spells drastically, especially when Merlin possessed the third type of Darkness Heart.

"Let's try it. Dark Mist!"

Merlin instantly cast Dark Mist and at once, the mist shrouded the entire room. The mist also seemed to continue in spreading outward.

The anechoic chamber was quite spacious. However, Merlin's Dark Mist was much stronger than before where its range was only within less than a hundred meters' radius.

Now, when Merlin cast Dark Mist, he could clearly sense that the marking of Darkness Heart had heated up rapidly. Furthermore, a strange force was imposed on the Spell Model of Dark Mist. Instantaneously, the power of Dark Mist rose as if it was cast by using an Enhancing casting tool.

Even the humblest estimate would suggest that the power of Dark Mist had doubled.

Merlin was gripped with shock. Dark Mist with a doubled strength was completely comparable to a First-level spell. If he cast the strengthened version of Dark Mist, its effect would be fearsome.

Upon thinking of this, Merlin could not wait to cast his First-level spell, Dark Light Realm. This was the crucial point. If the effect on the power of Dark Light Realm was as terrifying as this, Merlin's overall strength would be improved drastically.

Merlin waved his hands and got rid of the mist. Then, he cast Dark Light Realm. Different from Dark Mist, Dark Light Realm was able to refract light and made a certain region go completely dark. Moreover, it had a powerful hallucinating effect.

The hallucinating effect of an ordinary Dark Light Realm was able to pull a Second-level Spell Caster into its illusion, while a strengthened version of Dark Light Realm was able to easily put a Third-level Spell Caster into its illusion.

Now, Merlin wanted to test how far Dark Light Realm could be enhanced after he had cultivated the third type of Darkness Heart.

Along with the refraction of light, Merlin clearly found that the effect of Dark Light Realm was greatly increased. Even an ordinary Dark Light Realm could easily pull a Third-level Spell Caster into its illusion after the enhancement of Darkness Heart.

"Dark Light Realm!"

Merlin cast the spell again. Instead of casting an ordinary Dark Light Realm, he cast the strengthened version. At the same time, the marking of Darkness Heart on Merlin's chest gave off a scorching sensation.

This showed that Darkness Heart was also enhancing the strengthened version of Dark Light Realm. In fact, he was able to enhance all Darkness-type spells after he cultivated Darkness Heart. In addition, only a small number of Spell Casters was able to cultivate the third type of Darkness Heart even during the most glorious ages of Abyss Fort.

Furthermore, the true effect of Darkness Heart would be more apparent after the user had become a Fourth-level Spell Caster. After it was merged with a Darkness-type Fourth-level spell, the power of the final spell could be increased by of five to ten times.

At that time, Merlin's third type of Darkness Heart would be in its most fearsome form!

Now, the ability to enhance the power of spell had proved the strength of Darkness Heart. If it was the first or second type of Darkness Heart, it could only barely enhance the Darkness-type spell by a small amount.

"The strengthened version of Dark Light Realm that has been enhanced is so strong! Even a Third-level or an ordinary Fourth-level Spell Caster won't be able to escape from its illusion."

Merlin exclaimed wholeheartedly. If he cast the strengthened version of Dark Light Realm with the enhancement of Darkness Heart, its power would be fearfully strong. Spell Casters with Third-level Mind Power had no way of blocking it.

Even ordinary Fourth-level Spell Casters would be dragged into the illusion. However, Merlin did not know how strong Fourth-level Spell Casters truly were since he had not fought with them before.

Furthermore, there was still distinctions of strength among Fourth-level Spell Casters. Merlin's Dark Light Realm could not have any effect on the strong ones who had extremely powerful Mind Power.

Hence, the effect on Merlin's overall strength was quite apparent with the addition of Darkness Heart. He would even able to stand against Fourth-level Spell Casters.

"The Matrix, how long have I been cultivating?"

Merlin asked the Matrix.

"You've been cultivating for nine hours!"

Merlin thought about it for a moment. He had cultivated the third type of Darkness Heart in nine hours. This speed was relatively quick. This could also be due to Merlin's strong conviction where no illusions could delude him.

"It's time to go out."

Thus, Merlin stood up and left the anechoic chamber.

Wizard Leo and Wizard Hobbes became wide-eyed when they saw Merlin walking out of the anechoic chamber; their powerful Mind Power kept on sizing up Merlin.

"Merlin, have you cultivated Darkness Heart?"

Wizard Leo asked hurriedly, seemingly anxious as well.

Wizard Hobbes exchanged glances with the others. They had all heard about Wizard Leo but they were under the impression that Wizard Leo was an arrogant Spell Caster with a weird temper. Why would he be so caring toward a student?

Even if Merlin was a Six-Elemental genius Spell Caster, Wizard Leo did not have to help him by giving away such a precious thing – the cultivation method of Darkness Eye.

Looking at Wizard Leo's anxious looks, Merlin was grateful but confused. Wizard Leo had paid a great price in Abyss Fort for him to cultivate Darkness Eye.

Such help seemed to be beyond the defined relationship of a "teacher" and a "student".

However, Merlin stifled the question in his head and answered with a smile, "Teacher Leo, everything went smoothly. I've cultivated Darkness Heart!"

Wizard Hobbes was not surprised that Merlin had successfully cultivated Darkness Heart. When Merlin walked out of Darkness Void, they already knew that it was a piece of cake for Merlin to complete the cultivation of Darkness Heart. Generally, Spell Casters who were able to break through the illusions during the seventh day in Darkness Void could definitely succeed in cultivating Darkness Heart. In addition, they were able to cultivate the third type of Darkness Heart!

"Good!"

Wizard Leo only replied with one word, then revealed a pleased expression. He turned around and took out a delicate, thread-bound book from his ring. He said in a calm tone, "Wizard Hobbes, this is the cultivation method of Darkness Eye that I've devised, but there's only half of it here. You can first have a look."

After saying that, Wizard Leo handed the cultivation method of Darkness Eye to Wizard Hobbes.

Wizard Hobbes, Wizard Gryzllo, and Wizard Bahrain shot passionate glances at the book. They quickly came together and flipped the thread-bound book open, then scanned the pages.

Although there were only a few pages, Wizard Hobbes and the others had read it for half an hour. Even Merlin was a little intrigued by it. This was the cultivation method of Darkness Eye, after all.

On the contrary, Wizard Leo appeared rather calm. He did not rush them. Instead, he simply waited for them to finish reading.

After about half an hour, Wizard Hobbes raised his head and exchanged a glance with Wizard Gryzllo and Wizard Bahrain. The three of them saw the shock in each other's eyes.

"Incredible. Truly incredible. Wizard Leo, even the creator of Abyss Fort, the Great Wizard Damani, won't be able to devise such a cultivation method of Darkness Eye. Wizard Leo is able to devise the method which seems plausible to yield a result. Just by this, I'm truly impressed!"

"That's right. Although this is only half of it, we can understand some situations clearer now. Wizard Leo's cultivation method of Darkness Eye is indeed unique and marvelous!"

The three Seventh-level Spell Casters showered Wizard Leo with compliments after only reading the first half of the cultivation method. It was not surprising that Wizard Leo had directly handed them the first half with such confidence.

"Wizard Leo, when will you be able to give us the other half?"

Wizard Hobbes' eyes were brimming with passion. He seemed to have let go of the fight with Wizard Leo after reading the cultivation method of Darkness Eye.

"After Merlin has chosen his spells, I'll naturally hand the other half to you when we leave Abyss Fort."

Wizard Leo had already thought this through where he planned to pass the complete cultivation method of Darkness Eye to Abyss Fort.

Wizard Hobbes nodded, then said to Merlin hurriedly, "Wizard Merlin, we'll bring you to the library immediately. You can choose whatever Darkness-type spells that you want – from Second-level to the Sixth-level. However, you can only choose one for each level!"

Merlin nodded, and followed Wizard Hobbes to the library. Before having the first half of the cultivation method, Wizard Hobbes and others did not rush at all. However, after reading the first half, they were looking forward to reading the next half. They could not wait for Merlin to finish choosing the spell so that they could obtain the complete cultivation method.

Darkness Eye could only be cultivated after having a Sixth-level Darkness-type spell. In addition, Wizard Hobbes and other Seventh-level Spell Casters had constructed many Darkness-type spells. They would be able to cultivate Darkness Eye if they obtained the complete cultivation method. Thus, it was natural for them to be excited about Wizard Leo's cultivation method.

Soon, after walking past many mysterious passageways, Merlin and the others had reached a place which was rich with Darkness Elements. There were two large stone doors in front of them. On the wall beside the stone doors, there were many weird murals that made the people's skin crawl.

"Alright, this is the library!"

Wizard Hobbes turned around and pointed at the stone doors, with a smile on his face, to Merlin and Wizard Leo.