As the most famous hero in the Ulster Cycle of Celtic mythology, in the Land of Shadows, Cú Chulainn once obtained a spear bestowed by his mentor Scáthach.
This spear is Cú Chulainn's ultimate move and ace in the hole. It has the ability to reverse cause and effect, manipulating the order of events.
Once unleashed, the spear creates the "effect" of piercing the target's heart at the moment of release, making it irreversible.
In other words, it's an Noble Phantasm that guarantees a lethal strike, even if the user is killed before the spear's power is fully released. Once the power of the spear is truly unleashed, it follows the rules of causality and still manages to pierce the enemy's heart.
Although this Noble Phantasm is only ranked as a B-level anti-unit Noble Phantasm, its one-hit kill effect is astonishing. If used skillfully, it can be more practical and effective than Noble Phantasms of a higher rank.
There is no Noble Phantasm more frightening than this.
There is no more troublesome technique than this.
As the causality of "heart being pierced" has already been created, the trajectory of this spear is almost impossible to track. It follows a path that is guaranteed to hit the heart, and unless there is an extraordinary stroke of luck that unintentionally avoids the vital point, most enemies will fall under its strike.
At this moment, the power of such a magic spear is unleashed.
Moreover, the power of this spear surpasses its legendary rank, being thrown with astonishing strength and speed, not only demonstrating its lethal effect but also gaining power and velocity.
This magic spear's rank now surpasses its original B-level classification, reaching the realm of anti-army Noble Phantasms.
Now, this lethal strike pierces through space, coming from behind Rozen with formidable power and effect.
"Splurt!"
The sound of flesh being pierced echoes through the sky.
"Rozen!"
Scáthach, who couldn't reach in time, shouts in shock.
"Rorelai!"
"Rozen!"
Inside Chaldea, Olga Marie and Da Vinci also cry out, especially Roman, looking like he can't believe his eyes, wearing a terrified expression.
In the basin, the rest of the people finally sensed the commotion.
"Master!"
"Master!"
Karna and Rama, one with a stern expression and the other shocked, both exclaimed.
Then...
"Sen...pai...?"
The nearest Mash, with wide-open eyes, watched blood float before her and a stunned expression on her delicate and beautiful face.
Under the gaze of everyone, Rozen was pierced by a gruesome crimson magic spear, slipping through the seams of his ornate cloak.
Even though he wore the cloak transformed by Kinu, providing automatic defense, it seemed that not even Kinu had time to react. As a result, this lethal strike followed an inevitable trajectory, threading through the cloak's seams and hitting Rozen's body beneath.
In this way, carried by the astonishing power of the demonic spear, Rozen spewed blood as he flew backward.
"Boom!"
With a roaring sound, Rozen, taken away by the magic spear, crashed into the edge of the basin's cliff. Under the influence of the spear, now elevated to the level of an anti-army Noble Phantasm, the entire cliff seemed to be shattered and exploded, rolling down countless rocks, burying Rozen.
Everyone stared blankly at everything, their minds going blank.
Including Jason, Medea, Atalante, and Arjuna, they were all stunned by this sudden change.
Not long after, a spear shot out from the direction of the buried cliff, like a crimson beam of light, darting back and forth in mid-air for a while, then returning to the direction it had shot from.
There, an evil figure slowly walked out of the forest.
"Tap!"
With a crisp sound, the figure extended his hand, catching the returning magic spear.
"It seems it wasn't entirely unnecessary to make this trip."
Like an embodiment of a ferocious beast, covered in thorn-like spikes and evil patterns all over, with even his limbs transformed into something beastly, leaving only a fierce appearance and a tail-like appendage extending from behind, the man entered everyone's field of vision.
It was the Cú Chulainn, the King of the Celtics.
"Hiding in a place like this. If I hadn't seen that shabby ship flying over, it wouldn't have been easy to find you."
The Mad King Cú Chulainn spoke in a cold, cruel tone.
From his body, a terrifying aura, murderous intent, and even malevolence emanated, like a pitch-black tide, engulfing the entire basin.
"You...!?"
Jason was shocked.
"...!"
Atalante, Rama, and Arjuna subconsciously stepped back, causing Medea on the Argo to pale.
This Child of Light from the Celtic mythology exhibited none of the legendary brightness and heroism but only frightening evil and cruelty.
Rozen was directly pierced by the opponent's unleashed Noble Phantasm, the magic spear, and was instantly impaled.
"Ah... Aaaaah...!"
Mash emitted a despairing scream.
At this moment, Scáthach and Karna had already disappeared from the scene.
"Clang!"
Scáthach flashed beside Cú Chulainn like a gust of wind, brandishing a magic spear identical to his, turning into crimson lightning, fiercely striking.
"Boom!"
Karna also erupted in flames, carrying an icy killing intent, rushing to Cú Chulainn's side. Together with Scáthach, they unleashed their divine spears, making the spears resemble a sun in full bloom, directly assaulting Cú Chulainn's head.
"Roar!"
Finally, even the Berserker let out a raging roar, charging forward like a shell. With an axe-sword raised high, he fiercely swung it down toward Cú Chulainn.
The three top-tier, even extraordinary, Servants simultaneously launched a full-force assault on Cú Chulainn. Filled with overwhelming anger and fury, they attacked Cú Chulainn.
"Hmph!"
Cú Chulainn remained cold-faced, with only a hint of hostility in his eyes. He raised the demonic spear in his hand.
"Boom——!"
The next moment, a deafening roar echoed, unleashing flames, storms, and magical energy, transforming into shockwaves, expanding in all directions.
In the basin, a battle different from the one just now unfolded—a genuine and fierce fight.
And Rozen's scattered blood on this battlefield seemed particularly glaring.
...
Chaldea, Central Command Room.
"Ro...zen...?"
Watching Rozen being directly hit by Cú Chulainn's magic spear, slammed into the mountain wall, and subsequently buried under countless rolling rocks, Roman completely lost all reactions, standing there dumbfounded.
From his body, a magic power that seemed capable of overturning the entire world suddenly burst forth.
"Romani...!?"
Olga Marie, with a pale face, looked at Roman in utter astonishment.
"This is bad!"
Looking at Roman like this, Da Vinci's expression became more serious than ever before, completely taken aback.