Exchanging unknown knowledge is a complex and enormous undertaking, especially if there is little trust between the two parties.

In order to avoid being deceived, both Zhang Cheng and Iolem were very careful at the beginning, trying not to touch those costly core knowledge and technology, but choosing to start with less important gadgets that could distinguish the value of the system.

After a full ten hours, they had exchanged hundreds of spells, as well as many magical item making, scroll transcription, and alchemy techniques.

In the end, Zhang Chengcheng didn't want to continue to waste time on endless temptations, so he directly pointed to the last few pages of the list and said, "I want all the creation techniques of the core of Mythera and the Floating City!"

"Oh, you want to build your own floating city?" said Iolem, with a hint of surprise in his tone.

"No! I don't have any plans for this yet!" Zhang Cheng shook his head slightly. "I'm just a little curious about what kind of magic can keep a mountain floating in the air for long periods of time, and what kind of technology can ensure a steady stream of magical energy from its surroundings. ”

"Hehe, you know what? You're not the first to want information about Floating City, and you won't be the last. But I have to say that in fact, the Floating City is far from being as powerful as you think, especially the core of Mythera, which needs a relatively stable energy input state, that is, the magic net, which cannot directly draw power from the manic primordial energy, otherwise it will not fall directly from the sky when the disaster strikes. Of course, the most important thing is that this knowledge is very expensive. Iolem patiently explained.

"I've already decided!Please make an offer!" Zhang Cheng was obviously not interested in hearing this, and put on a straightforward posture of trading.

The reason is simple, as the most important cornerstone of the ancient Netherel civilization, the core of Mithera means that it does not require too much energy to maintain the effect of magic, as long as it stays within the radius of influence of the core of Mithra.

There is no spellcaster who does not desire such a treasure.

What's more, several powerful spells to create a floating city, one can instantly flatten a mountain, and two can reverse gravity, causing thousands of tons of rocks to float in the sky, even as a large-area destructive spell.

"Well, if you insist......" Iolem sighed nonchalantly, quickly scanning the list in front of him, and then tapped twice on it with his tentacles. "I'm going to create and control the way to create and control evil energy, as well as the demon rune system. ”

Zhang Cheng narrowed his eyes and hesitated for a moment, then quickly nodded: "No problem!

The words just fell!

Both of them took the corresponding memory fragments from their own minds and handed them to each other.

Moment!

Vast amounts of knowledge are transmitted directly through the psychic connection to the cerebral cortex, from which it is stored in the hippocampus, and finally into the long-term memory area.

All of a sudden, a large amount of complex and jerky knowledge made Zhang Cheng feel dizzy.

Fortunately, he is now an out-and-out divine creature, otherwise this act of forcibly infusing memories into the brain alone would cause a cerebral hemorrhage and even brain death.

I don't know how long it was, maybe a few minutes, maybe an hour or two......

Anyway, once he fully understood the jerky knowledge, Eolem had begun to experiment with distorting arcane energy to create large expanses of green demonic flames.

Although he can't fully control it yet, he has undoubtedly brought this powerful and evil force under his control.

"How are you feeling?" the Grand Arcanist asked nonchalantly, fiddling with his newfound power.

"It's okay, it shouldn't be a big problem. Let's move on. Zhang Cheng shook his head a little flat.

"If I'm not mistaken, the next thing you want is the magic that creates the Undead Mastermind and merges with it, right?" Iolem teased, smirking.

"Yes, I found that most creatures in this world have a limit to intelligence, and this limit is determined by the size of the brain. Only the Mind Flayer Mastermind, who can increase its size infinitely, can get rid of the limitations. Zhang Cheng didn't intend to hide it, and gave a straightforward affirmative answer.

In fact, the two biggest purposes of his trip were to obtain the full set of construction techniques for the Floating City, and the other was to obtain a magical ritual that fused with the Mind Flayer's mastermind.

"I don't understand! You are already a divine creature, in principle, as long as you continue on this path, you will inevitably gain the authority of divine power, and then the attributes of mortals are nothing at all, so why bother to do more?"

"I never intended to be one of the gods! Plundering divinity is just about figuring out what the gods are and how they can actually kill them. You may not believe it, but even the dragon body I have now is only a temporary shell, and I don't mind using it for some crazy and dangerous experiments. ”

"I see, I see. Your own body didn't enter the world, did you?" said Iolem as if aware of something, meaningfully tentatively.

Zhang Cheng opened his mouth and nodded with a smile: "That's right." So I don't care about death at all, and I can even say that I have no scruples. ”

"Very interesting! I would venture to ask, did you come to this world because of some kind of magical technology, or because of some accident?"

"It's because of a piece of parchment! In general, I'm more of a puppet under control, or a mercenary on a mission. It might be a bit complicated to explain, but once you've read this, you should understand......"

After that, Zhang Cheng unhurriedly took out the magical parchment scroll.

Perhaps it was the hope that the greatest spellcaster in human history could crack the secret behind the parchment and give himself a little guidance, no matter how bad it was, that was why he made such a bold move.

But the moment the parchment scroll appeared, for some reason it released a dazzling golden light!

Next second!

Rumble!

A terrifying energy descended from the sky!

Slam it on top of Iolem's head!

Although he foresaw the danger in advance, he propped up a huge protective lock.

But these shields, which were woven together by dozens of protective magics, didn't hold up for even ten seconds before they shattered on the spot, and the left half of the brain was blown to the point of flesh and blood by the remaining energy.

Luckily, the energy came and went quickly, shattering the left pool of the brain and then disappearing without a trace, as if it had never appeared.

"Damn! put it away! hurry!" said Iolem, who had no grace and roared like crazy.

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