Ronald's eyes remained fixed on the Caster holding the "Essence Theory".

This was the most formidable enemy present.

And truly the only one who posed a threat to him.

If he wanted to win this battle, Ronald knew that taking care of this guy was the key of keys.

However, the difficulty in winning this battle lay precisely in this.

The other members of the "Nine Commandments Assembly" were also aware that this Caster was their utmost core priority, so not only did the Caster create multiple duplicates, but even the one whose emotions were intensifying was also consciously standing in front of the holder of the "Essence Theory".

One of these two maintained an unbreakable Klein Shield, while the other created several duplicates to fill other gaps.

With only two of them.

They managed to create an impenetrable defense line, making it difficult for Ronald to rush over and defeat the enemy first.

"In December 1831, I had the good fortune to become a naturalist and board the Royal Navy ship 'Beagle' for a five-year global scientific investigation..."

Ronald recited the incantation swiftly.

He fully activated the power of "The Origin of Species", starting to modify and enhance his leg muscles to boost his next move's speed.

At such times, there's no room to consider miscellaneous aspects.

Securing as much advantage as possible is the optimal choice.

Furthermore, Ronald was quite confident in his physical capabilities.

Even though these two guarded the Caster holding the original "Essence Theory" behind them, Ronald's speed was still a notch faster. Now with a further specialization enhancement by "The Origin of Species".

He was fully confident that he could overwhelm the opponent's reaction limit with peerless speed before they could react.

—The assault was imminent!

Ronald gripped the Longsword of Saint Catherine tightly, and the flames of the Power of Daylight ignited on the blade.

He was just about to sprint forward.

But right at that moment, an unexpected event occurred again.

The effects Ronald had just applied to himself with "The Origin of Species" suddenly vanished!

Whether gradual or intense evolution, or actual physical transformation, all failed abruptly, even the vital force that always resided in Ronald vanished without a trace.

What did this mean?

This meant that nearly half of the spells from "The Origin of Species" were unusable, as the life power provided by the [Mutation] ability is foundational to the entire original spell's execution.

At this moment, only the special abilities like [Instinct] and [Adaptation to Environment] were still effective on Ronald.

"..."

Out of shock, Ronald moved his gaze forward, immediately realizing the source of the situation.

—The effect still stemmed from the "Essence Theory" spell.

The so-called support from the opponent was, at the moment Ronald activated the spell, sealing his casting ability to enhance their companion's odds!

Meanwhile, the enemy maintaining the Klein Shield had already rushed to confront him.

Several more distant duplicates also spread out again, ready to surround Ronald in the same manner again. However, unlike before, this time he intended to include the shield-bearing companion within the barrier too.

Once the opponent's goal was achieved.

This place would become an inescapable arena.

Forcing Ronald and the enemy with the Klein Shield to fight to the death within!

The battle situation took a sharp turn for the worse, but Ronald still remained calm.

By drawing on his combat experiences since crossing into this world, he realized a rather unreasonable situation.

If it could continuously seal enemy spells without any limit.

The spells of the "Essence Theory" were indeed too powerful and bizarre, in complete defiance of Ronald's understanding of the original abilities.

These books, as sources of magic, are indeed strong, and the Complete Techniques can achieve rule-level extraordinary effects. But for common spells, they couldn't be that invincible.

There must be something he hadn't noticed.

Thinking like this, Ronald tried to conceal his actions as much as possible and murmured softly:

"Its name is Styx,

The black water flows downward, to the foot of the dim and steep cliff."

The next second, the ability to perceive human emotions returned to Ronald, and a wisp of Hell's black mist reformed at his sleeve.

Ronald guessed correctly.

The spell-sealing ability of "Essence Theory" was indeed not the unbelievable effect that could block all enemy spells completely. Instead, when the enemy cast a spell, it could anchor onto one spell and completely seal it.

Once the target of the seal was switched, the previously locked spell would be liberated again.

Ronald felt relieved at once.

The first volume of "Essence Theory" had a strong critique against creationism, reflected in the original spell as a critique of the mystical and a sealing against spells.

If the opponent truly possessed the ability to lock down all spells...

Then Ronald would need to consider not how to defeat the enemy but how to escape from this island!

With the current situation, Ronald finally had relatively ample operational space...

"Fight me! You still dare to be distracted?"

Just then, an angry shout rang out from in front of Ronald.

As Ronald calmly analyzed the opponent's ability and his situation, the enemy keeping the Klein Shield had already rushed to his face.

Facing Ronald, who seemingly didn't consider him worth his attention.

This already furious Caster regarded this as an insult and became even more violent.

And so, as he shouted loudly.

He raised his fists high and smashed down directly towards Ronald's head.

Bang——

Without a word, Ronald lifted his sword to block, resulting in a situation much the same as before.

The perfect physical defense capability provided by the Klein Shield meant he couldn't break the opponent's defense at all. In essence, no matter what action Ronald took, it was like fighting himself.

Because any attack, as long as it struck the Klein Shield, the two-dimensional surface characteristic would transmit the force back entirely, coupled with the force of the enemy Caster's attacking.

This constituted a terrifying effect that suppressed anyone.

This attack seemed decisive.

Ronald leaned back and fell directly to the ground.

Seeing this, the Caster maintaining the Klein Shield felt as if victory was at hand.

"Hahaha!"

"Get up, keep fighting me!"

"Why aren't you as arrogant as before now?"

He laughed arrogantly, while continuing to punch down.

Under his successive attacks, the ground kicked up dirt and stones, and the earth trembled.

And Ronald, holding the Longsword of Saint Catherine, was seemingly immobilized by his attacks, lying on the ground as if completely defeated.

But if observed closely.

One would discover that although Ronald seemed thoroughly suppressed, his hand gripping the Longsword was still clutching tightly, not at all showing a state of impending death!