Became The Son Of The Final Boss [EN]: Chapter 269

269.

As the sun reached its zenith, the Undead began to appear.

I narrowed my eyes and bit my lip tightly.

With more intense determination than ever, I summoned the Spirits.

As the highest-grade Spirits manifested above the Undead, wind, fire, water, and earth blanketed the battlefield with their respective powers.

At the same time, the castle gate swung open.

“Advance!” I shouted.

Following my command, we surged forward like a wave, crashing into the rear of Karen’s forces.

Olivia, Gale, and I spearheaded the charge.

The sky darkened.

Gooooooo-!

Lilian was unleashing an overwhelming amount of mana from atop the castle walls.

Kwaaaaang-!

The earth split and trembled.

It was hard to believe that such power could be wielded by a single human.

Earthquake.

A natural disaster was being unleashed by human hands.

The moment Lilian’s mana output intensified, a streak of light shot towards her.

Pshweek-!

Lilian’s magic was disrupted, and the earth, which had been splitting and shaking, stilled.

Olivia stepped into the air and flew towards the source of the light aimed at Lilian.

‘Karen!’ I thought.

My eyes widened, and I immediately prepared to summon the Spirit King.

At that moment, I sensed a strange, malevolent intent.

Instinctively, I twisted my body, guided by the flow of the wind.

Kwaaaaang-!

“Indeed,” a voice said.

Four wings, terrifying magical power.

Horns rising above his head.

Not Undead.

A dark energy completely different from the eerie energy of the Undead.

Watching the figure approach, radiating an energy identified as ‘Magi,’ I summoned the Spirits.

The Spirits arrayed themselves around me like bodyguards.

The appearance of a Demon was completely unexpected.

I immediately unleashed the Spirits’ skills, but the Demon blocked them effortlessly.

Kwaaaaang-!

Seeing the Demon effortlessly nullify even the wind blades unleashed by the highest-grade Spirit, I realized I was facing a formidable opponent.

Olivia was already engaged in combat with Karen.

My father and Gale were simultaneously facing a Demon on the castle walls.

The Demon who appeared before me seemed strong enough to contend with a Sword Master and my father at the same time.

Lilian’s magic was also being suppressed by a Demon.

‘Four Demons in total?’ I wondered.

The Demon approached and spoke.

“I’ve been waiting.”

Watching the guy say something incomprehensible, I bit my lip tightly.

The four Demons were a game-changing variable.

We had capitalized on the element of surprise and attacked the rear, and the defending forces had even opened the castle gates and poured out, but now the super-powered individuals were tied up by the Demons.

I summoned the Spirit King.

‘I have to end this quickly,’ I resolved.

Phoenix manifested.

Phoenix possesses stronger firepower than Aquilus.

This meant that the power of the Spirit Stone given by my father was still stronger than my own mana.

Aquilus is summoned using my mana, but Phoenix is summoned using the power of the Spirit Stone, which has not yet been fully integrated.

Therefore, every time Phoenix is summoned, the mana of the Spirit Stone that has not been fully integrated diminishes.

My mana can be recovered and steadily accumulated through breathing techniques, but the mana of the Spirit Stone is a consumable resource that decreases with use unless it is integrated.

Initially, summoning Phoenix was merely a temporary measure to deal with unstable mana that had not been integrated.

Unstable mana that has not been integrated has a negative impact on my body itself, and if it goes berserk, I could die.

Now it is stable and well-positioned.

I just haven’t been able to integrate it.

Even if it is a consumable, if I can integrate it with my mana core in the future, it would represent an incredibly large amount of mana.

I regretted it, but the situation on the battlefield was more pressing.

If I can’t defeat Karen here, the Empire will surely sink into an endless quagmire of war.

“Oh, a King,” the Demon observed.

A spear materialized in the Demon’s hand.

Phoenix frowned.

“It’s definitely a Demon, but I don’t sense the Demon Realm?”

“Quite arrogant for someone who has just ascended the throne,” the Demon retorted.

I immediately commanded Phoenix to attack.

Maintaining Phoenix’s presence was already a challenge in itself.

Phoenix flew towards the Demon.

A huge brown sphere formed on the Demon’s spear, blocking the flames pouring from Phoenix.

Kwaaaaang-!

The difference in power was immediately apparent with a single clash.

Phoenix held a slight advantage over the Demon.

‘Just ascended the throne, huh……’ I thought.

I realized something from the Demon’s words.

Just as my Spiritism is immature, the Spirit Kings are also limited in how much power they can exert in this world when responding to my summons.

I had been ‘mistakenly’ thinking that the Spirit Kings were exerting their full power until now.

Because their very existence annihilated the Undead and they played a tremendous role.

Phoenix felt much the same way.

His pride was wounded.

“A clumsy Spirit King is no King,” the Demon sneered.

The Demon’s figure blurred, leaving afterimages.

I felt a surge of danger and shook the ground around me using Claime [a technique to manipulate the earth].

Kwaaaaang-! Kwang-!

The Demon retreated from the rising ground as he attempted to attack me.

Phoenix reduced his size.

He judged that it was impossible to keep up with the Demon’s speed with an unnecessarily large body.

‘Pour mana into me,’ Phoenix urged.

I nodded in response to Phoenix’s will.

The other Spirits returned to the Spirit Realm, and mana flowed towards Phoenix from my original mana core as well as the mana of the Spirit Stone.

Phoenix’s appearance began to shift, taking on a humanoid form.

Any Spirit tends to adopt a certain form when summoned to the Intermediary Realm, but the Spirit King was different.

I newly learned that they can alter their form at will.

‘Come to think of it, Aquilus was just the wind itself,’ I mused.

Phoenix, now a flame soldier with his whole body burning, summoned a sword.

I took a deep breath.

Properly controlling the amount of mana flowing into Phoenix is the essence of ‘Spiritism’ [the art of summoning and controlling spirits].

Spiritists do not fight directly.

They only fight through the medium of Spirits.

Therefore, the level of a Spiritist is determined by how well they resonate with their Spirit.

I was second to none in that regard.

Because I and the Spirit can read each other’s will.

Like instinct.

Phoenix instantly rushed towards the Demon.

* * *

The moment sword met sword, Olivia realized.

Karen was slightly stronger than herself.

It was hard to believe.

After reaching Grand Sword Master [the highest rank a swordsman can achieve], she thought there were no rivals.

Olivia, who considered the Demon King an exception and prided herself on being the strongest among humans.

She had heard stories about Karen until her ears were sore, but she never imagined he would be stronger than herself.

‘I don’t know his swordsmanship yet,’ she thought.

Olivia moved in the air as if she were on solid ground.

Karen’s eyebrows twitched at the fluid movement.

“Your mana control is excellent for a member of the evil forces,” Karen remarked.

Karen was surprised by Olivia’s precise attacks.

It was a continuous chain of attacks, making it difficult to find an opening.

Olivia knew that the moment her attack faltered, she would be immediately countered.

‘It will be fatal. I must never give him an opening,’ she resolved.

Through long combat experience, Olivia had become a seasoned knight.

If you can’t press your advantage, you will be countered by the opponent.

Chang-! Chang-! Chang-!

Even though they were fighting in the air, the two did not use Aura Blades [a technique to enhance a sword with mana] or other advanced techniques.

A pure swordsmanship battle!

That’s why Olivia was even more surprised.

Karen was like an unknown knight.

He was not from a prestigious family and was said to be a mercenary.

However, Karen’s swordsmanship showed signs of having been honed for a very long time.

The secrets of swordsmanship, called orthodox swordsmanship, which various families have accumulated for decades or hundreds of years, were integrated into Karen’s sword.

“Excellent swordsmanship,” Karen commented.

Olivia did not bother to answer Karen’s words.

Chang-! Chang-! Chang-!

She had no time to speak if she didn’t want to miss a single moment.

In other words, Karen had the余裕 [leeway] to spare against Olivia.

‘It’s disadvantageous,’ Olivia realized.

Olivia put more strength into the sword she swung towards Karen’s chest.

And the speed increased.

Karen widened his eyes.

Chang-!

Immediately after parrying Olivia’s sword, he aimed for Olivia’s shoulder.

Olivia sacrificed her shoulder to avoid the counterattack.

Pshook-!

The moment Olivia’s face contorted in pain, Karen’s pupils grew even larger.

She had grabbed the sword that pierced her shoulder with one hand, and the hand holding her own sword moved once again.

Humans tend to hesitate when their body is pierced by a sword.

When cold metal pierces the skin and reaches the bone, the pain cannot be endured by the willpower of ordinary humans.

Knights are not much different.

Olivia did not flinch for a moment.

Karen underestimated Olivia for a very brief moment, and the price was terrible.

Pshook-!

The sword dug in right above the heart.

Soon, the two began to fall to the ground with swords embedded in each other’s bodies.

“Kueeehk!” Karen screamed, biting his lip tightly.

He tried to pull out the sword stuck in Olivia’s body, but the sword did not budge.

Karen sent mana directly into the sword due to Olivia’s grip, which was much stronger than he had expected.

Pshusshushook-!

Smoke rose from Olivia’s shoulder.

The Aura Blade literally severed Olivia’s shoulder.

At the same time, Olivia also drew her sword upwards.

A pure white Aura Blade erupted from Karen’s body.

Kwang-!

The two fell.

Olivia immediately brought her hand to her shoulder and stopped the bleeding with mana.

A part of her shoulder was completely blown away.

Karen was completely split vertically from his heart to his shoulder.

It was quite a serious injury.

Nevertheless, Olivia immediately rushed towards Karen.

Karen also quickly stopped the bleeding and swung his sword once again.

Kwaaaaang-!

The swordsmanship battle disappeared, and before they knew it, the two began to use Aura Blades with such intense mana that they even distorted space.

Kwaaaaang-!

The aftermath was directly conveyed to the surroundings.

Not only the Undead but also the Imperial soldiers were swept away by the shockwaves of the Grand Sword Masters’ Aura Blades colliding and exploding, and their bodies were torn apart.

Before they knew it, no one was left around the two of them.

Olivia smiled.

“We don’t have much time, so let’s finish this quickly.”

“The fact that I can kill a great evil like you with my own hands is a blessing from God.”

“Crazy bastard,” Olivia retorted.

The two rushed towards each other.

* * *

Ron was not flustered by the appearance of the newly arrived Demon.

“Gale.”

“Yes, Your Majesty.”

“Hold the Demon for a moment.”

The Demon who was facing Ron and Gale smiled arrogantly.

“Human, do you think I’m toying with you because I can’t kill you?”

Before the Demon could finish speaking, a Spirit burst from the ground in front of him.

Pshook-!

The Demon barely dodged, but soon Gale’s sword dazzled the Demon’s eyes.

And Ron swung his sword in the meantime.

He unleashed magic in a short moment and dropped it into the Undead’s camp.

Kwaaaaang-!

If Ron himself didn’t help the soldiers in battle, they could be pushed back.

He did not forget to check on Arune.

‘You’ve grown a lot,’ Ron thought.

Ron was proud to see Arune freely wielding Phoenix.

He was enduring the Demon alone, whom even Ron could not handle alone, and helping the soldiers fight like Ron.

“Your Majesty!” Gale shouted.

Ron came to his senses.

“You can’t afford to be distracted. I told you, I’m not toying with you because I can’t kill you.”

The Demon’s sharp claws grazed Ron’s neck.