Fang Ka glanced at the still unconscious Sonam and then raised an eyebrow: "You mean after the construction of the Underground City?"

Xia Lin immediately realized that she had expressed herself unclearly, and quickly added: "The completion of the Underground City and the concealment of the island took roughly nearly two years. I mean after the completion of the Underground City."

Fang Ka gently nodded: "The Underground City within that island must be vast, right? Even with the goblins' specialized alchemy excavation tools to assist, it still took so long."

Xia Lin promptly nodded: "Yes, it's extremely vast."

"By the way, Master Fang Ka, I think I should first read the memory of that Goblin Knight before continuing to speak with you."

"Because Sonam usually stays in his exclusive Royal Palace conducting research, and only goes out for a round every six months, the routine management and planning of the Underground City are all left to those managers."

Fang Ka glanced at the Goblin High Tier Knight: "Hmm."

Xia Lin stopped speaking, then began to read the memories of that Goblin High Tier Knight.

However, during this memory reading, Xia Lin's emotions were clearly off, her face paling to the extreme, alternating between blue and white.

After a good while, Xia Lin finally opened her eyes, looking at that Goblin High Tier Knight with an expression as sharp as a knife.

"What's wrong, Xia Lin?" Fang Ka asked in a slightly puzzled tone.

Xia Lin was silent for a moment and then glanced at the adorably clueless Noel in the distance, finally leaning close to Fang Ka and speaking in a voice only the two of them could hear:

"All daily affairs of the Underground City are handled by these two Goblin High Tier Knights. They don't treat those slaves as people at all, viewing them as livestock, breeding them, abusing them, and sometimes even eating the babies of those slaves..."

"And there are many other unspeakable things; it's hard for me to mention..."

Listening to Xia Lin, Fang Ka's face also darkened.

He never considered himself a person of justice, and could accept many of Kain's inhuman alchemy experiments, but this kind of purely psychological distortion, completely to satisfy one's twisted desires without any bottom line of a sentient being, was indeed somewhat revolting to him.

Originally, he hadn't planned to spare the other party. After all, a High Tier Knight, if approached while awake, was still quite dangerous. But now he didn't want to just kill him so easily and give him the easy way out.

After a brief silence, Fang Ka slowly spoke: "I'll teach you how to disable the Vital Acupoint; you help me disable his Vital Acupoint, then I have some alchemy experiments that require him as the main subject."

Vital Acupoint is different from Demon Source.

The Demon Source can only be damaged by causing a strong backlash of the Magic Pattern, which is generally one of the most serious backlashes when studying the Magic Domain.

This means that the Demon Source cannot be damaged by others, and even damaging it yourself is not easy. In most cases, one dies from the backlash of the Magic Pattern before causing any damage to the Demon Source.

Vital Acupoint, however, is different. Others can disable it, but the process is like being sliced by a thousand knives and will cause the Battle Energy within the Vital Acupoint to erupt explosively, allowing the disabled Knight to exceed their usual strength temporarily.

There are many ways to disable the Vital Acupoint, most using Battle Energy to disable it, and a few using Magic to disable it.

Fang Ka happens to have a Dark Element magic 'Abyssal Corrosion' that can be utilized.

This is a 'Series Type' magic.

The creator of this Dark Element magic is said to be a Top Tier Necromancer.

Therefore, this Dark Element magic possesses a whole series from Basic Level Abyssal Corrosion up to Top Tier Abyssal Corrosion.

The effect of 'Abyssal Corrosion' is simple. The victim will have their Battle Energy and magic power rapidly corroded.

Simply put, it's energy burn.

If a Mage doesn't block it with Defensive Magic, they can only clear it with a same-tier Purification Type Support Magic or drink a same-tier Purification Type alchemy potion if hit.

If neither is available, once magic power is completely corroded, there's no real harm to the body.

The only side effect is that once magic power is generated again within the body, it will continue to be corroded.

However, as long as one can withdraw from combat, there is plenty of time to seek help from another Mage who knows Purification Type Support Magic or to buy a Purification Type alchemy potion.

If a Knight is hit, they face it head-on. If their Battle Energy is of high tier, they can directly extinguish this abnormal erosion.

For example, if a Top Tier Knight is hit by a High Tier Abyssal Corrosion, they can rely on their high-quality Battle Energy to directly extinguish the Abyssal Corrosion effect.

But if hit by the same tier of Abyssal Corrosion, they can only drink a same-tier Purification Type alchemy potion.

If unavailable, once the Battle Energy inside is completely corroded, unlike Mages, Knights will have their Vital Acupoint directly corroded until it disappears completely, turning them into an ordinary person.

The Mage who created this magic probably started trying it specifically against Knights.

It's quite convenient to use this magic to destroy the Vital Acupoint of this Low Tier High Tier Knight.

The only danger is that damage to the Vital Acupoint will unleash all potential, causing a surge of Battle Energy far exceeding the usual state.

However, with Noel around, nothing will go wrong.

Not to mention, Xia Lin, this High Tier Mage, is not just for display.

Listening to Fang Ka's instructions, Xia Lin looked disdainfully at that Goblin High Tier Knight, nodded through gritted teeth: "Alright, Master Fang Ka, I'll definitely take care of it for you."

Fang Ka glanced around, then in a voice only the two of them could hear, taught Xia Lin 'High Tier Abyssal Corrosion.'

He did not teach the entire series to Xia Lin, as that would be like turning on a light in broad daylight, redundant.

Basic, Low Tier, and Middle Tier Abyssal Corrosion, Xia Lin didn't need those, and she couldn't use Top Tier Abyssal Corrosion.

After listening to Fang Ka's teachings, Xia Lin then instructed Noel to keep an eye on the state of that Goblin High Tier Knight, ready to act at any time.

Then she cast it on that Goblin High Tier Knight.

At first, the High Tier Goblin Knight didn't react much, but when his Battle Energy was completely corroded and started corroding his Vital Acupoint, the searing pain woke him instantly.

At the same time, his Vital Acupoint was damaged, exhausting all his potential and erupting with a powerful Battle Energy.

Noel moved instantly, punching fiercely at him, and the Goblin High Tier Knight, with bloodshot eyes, swung a punch at Noel in return.

However, Noel's figure flickered slightly, dodging directly, and in the next moment, his fist smashed into the shoulder of the Goblin High Tier Knight.

The Battle Energy exploded suddenly; the Goblin High Tier Knight's arm emitted a sickening crack of broken bones.

His arm hung limp, and the Battle Energy covering his fist struck the ground, creating a deep pit on the surface.

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