In Ayn Grandrie, each floor boss has a different room.

Like the boss room on the first floor, it is a hall similar to the Hall of Hearing.

Like the Boss Room on the 74th floor, it is a battlefield similar to an altar.

The boss room on the 75th floor is a fairly large egg-shaped space, covering an area the size of the arena in Corinia, and presenting an arc-shaped wall that gradually extends upwards until it is far above before bending and closing together, showing a sense of closure that the boss room on the floor did not have in the past, making the temperature seem to have climbed.

At this time, the top players of the total 737 SAO swarmed in and dispersed in batches, standing in various positions, raising their weapons.

"Boom!"

The door behind him closed with a loud bang, telling everyone that this battle could only be fought to the end, and there was no way to retreat.

"Knock... Knock knock..."

I don't know where the sound of a substantial heartbeat came from, but it was clearly audible.

“————”

The silent air seemed to turn into a viscous mire, making it impossible to breathe.

"Gollum..."

It seems that someone swallowed a mouthful of saliva, causing their voices to echo in this space.

One player formed a formation in groups of three or five, weapons clenched in their hands, and their eyes wandered around nervously, looking for the figure that must be extremely large, symbolizing the boss-level monster.

However, after waiting a full minute...

"No...?"

Holding two one-handed swords, one black and one white, Kirito who has fully learned the skill of "Seeking the Enemy" seems to be surprised and vigilant.

"Where's the boss?"

"Why not?"

Klein and Achill were equally surprised, causing all the players present to look at each other.

The boss of the defending layer did not appear for a long time, so that the scene gradually appeared noisy.

“......”

Even Asuna's face tightened, her gaze swept around her like a sharp sword.

Luo Zhen naturally also kept scanning every corner of the scene.

It's a pity that even Luo Zhen, who has the "Heart Eye", can't detect the existence of the Guardian Boss.

After all, the skill called "Heart Eye" can see the microscopic world, not the world in front of you, and the real power lies in peeking through phenomena, not looking at reality, so even Luo Zhen can't detect anything unusual.

(If there is a "Heavenly Eye" at this time...) ）

Then even if the enemy can be invisible, Luo Zhen can find it.

But what he didn't have was nothing, Luo Zhen didn't have the luxury of not having the cards left in his hand, so he could only look at the space in front of him with all his might.

That's when ...

"Goo!"

"Whew!"

Cai Butterfly and Hua Butterfly, who had been vigilant by Luo Zhen's side all along, let out a sharp cry at the same time.

Luo Zhen instantly understood the meaning of the screams of the demons.

The demons with superior perception ability are telling Luo Zhen.

"Upper!"

Luo Zhen raised his head violently and shouted at all the players around him.

“————！”

All the players present were suddenly shocked, raised their heads vigorously, and looked up.

In the next second, a foreign object filled the field of vision, making everyone's eyes widen.

"Click, click..."

This is the movement caused by the bones when they move.

That's what comes into the eyes of all players.

It was a monster about ten meters long, composed of most of the body segments, with a pair of sharp feet also made of bones sticking out from each segment, and a vicious skull in the shape of a human face, with sharp fangs on the jawbone protruding forward, and huge bone knives like scythes on both sides of the skull.

The moment they saw this monster, everyone could only think of one animal.

———— "centipede".

It was a monster with a ferocious human-like skull, a pair of scythe-like bone blades, and two pairs of four eye sockets hanging up high on the skull, glowing red blood on the inside, and the whole body was made of bones.

When all the players focus on the monster, the monster's official name and the color of the buoy are revealed.

Officially known as ———— "Bone Hunter".

The color of the vernier is blood red, which is very close to black.

The moment he saw this, Luo Zhen understood.

This is a boss-level monster second only to the Scythe of Destiny in the underground labyrinth of the Black Iron Palace.

The monster known as the Bone Slayer was red-eyed, wriggling countless steps, clinging to the ceiling, looking down at all the players below.

“————！”

The screams that were like the cry of a baby and the howl of a terrible ghost resounded from the other party's bone jaws without any vocal tissue.

The terrifying appearance, terrifying screams, and equally terrifying ferocity made the players present tremble uncontrollably while their eyes widened.

This is the Tier 75 Boss Guard.

After the 25th and 50th floors, the strongest monster that stood in the way of the 100th floor descended here.

"Click, click...!"

With a stupid sound of bone joints, the bone centipede jumped from the ceiling like a falling spider.

Luo Zhen reacted in time.

"Spread out!"

The oppressive shout was like a blow to the head, waking up all the players who were intimidated by the bone hunters.

"Scattered... Disperse! ”

"Spread out!"

"Disperse!"

So, under the desperate shouts of Kirito, Klein, Akyll and others, one famous player dispersed desperately.

The formation is out of order.

However, this is all it takes for now.

“————！”

The Bone Slayer let out a terrifying howl and swooped down as he raised a pair of bone scythes alof.

And the person who confronted the pair of bone sickles was the only player who did not disperse———— Luo Zhen.

"Luo Zhen!"

Asuna, who was running out, suddenly stopped and exclaimed.

But Luo Zhen had no more time to respond to Asuna.

Luo Zhen just stared closely at the bone hunter who swooped down from above, bringing a vicious aura.

Although a drop of sweat was dripping from his forehead, a fearless smile appeared on Luo Zhen's face.

"Do you want to kill me?"

Luo Zhen clenched the crystal sword in his hand.

"Then let's try it!"

The moment the shout sounded, the effect light of the sword technique bloomed on Luo Zhen's crystal sword.

The basic stage advance technique of the one-handed sword ———— "Sonic Impact".

"Drink, ah!"

With a loud shout, Luo Zhen slammed on the ground, and under the system propulsion provided by the sword technique, he rushed towards the direction of the sky.

“————！”

The Bone Hunter howled again.

The two sides are closing in on each other at breakneck speed.

In the end, the crystal sword that shone with green light and the bone scythe that shimmered with cold light suddenly slashed at each other as if cutting through space.

"Bell ————!"

The crashing sound loud enough to stir up a wave of sound turned into an echo and wandered through the room of the boss on the floor, causing the effect light to explode like a flash of light, causing bursts of sparks.

"Goo!"

"Whew!"

The colorful butterflies and flower butterflies also immediately flew upwards and turned into two rays of brilliance.