Abyss invasion? As a demon cultivator, I laughed.

"This apartment building is not a cheap rental apartment. Although it does not use high-end materials, at least it does not cut corners and has good sound insulation."

"During the day, even in combat, as long as there is no particularly sharp sound, the range of ghouls that will be attracted is generally only two or three floors."

"At night, this number may double. If the perception of ghouls is enhanced, it is possible to double again!"

"But no matter how you estimate it, ten floors should be the limit, and the awakened ones should be about the same."

"And according to the reasoning that the nest of these ghouls is underground, the higher the floor, the less density of ghouls should be."

Chu Xiu chose the twenty-first floor to ensure that his hunting would not attract the attention of other awakened people upstairs, and to minimize the number of ghouls he encountered.

Then, the location he chose was also very particular.

This house is a high-end apartment in this apartment building, with a particularly large space, which can maximize the power of the bone blood-sucking array.

What Chu Xiu likes most is that the owner of this house arranged a two-meter-long corridor during the decoration.

On the left is a shoe cabinet and storage box, and on the right is a wall and fish tank. After Chu Xiu reinforced it with miscellaneous items, it became a perfect advantageous terrain, allowing Chu Xiu to face only one corpse ghost at a time.

Chu Xiu moved another wardrobe, removed some wooden boards to leave a gap for the bone spear to attack, and reinforced it with other furniture, and placed it at the end of the corridor, which now has another qualified cover.

Then add some causal points!

As Chu Xiu's mind moved, he directly added 54 causal points to the Yinfeng Blade! Almost all of his causal points were spent!

The later it is, the harder it is to upgrade the level. Chu Xiu experimented before, and one causal point can only provide 3 to 4 points of professional experience, which is far from enough to upgrade!

This is the result of his killing a lot of creatures during this period, and the increase in killing sins. If he changes to another profession, he will add even less!

The most cost-effective use of causal points is to upgrade skills!

These 54 causal points directly upgraded Chu Xiu's Yinfeng Blade by two levels! From entry to proficiency, and then to small success!

[Yinfeng Blade]

[Proficiency: Minor (2/800)]

[Release cost: 0.6-4.0]

[Release time: 0.8s-2.4s]

[Power: 2.0-9.5 (decay with distance)]

[Speed: 32m/s-55m/s (decay with time)]

[Limit distance: 35m-105m]

[Cooling time: None]

The current Yinfeng Blade can be released quickly within 0.8S, consuming only 0.6 energy, and directly has a power of 2.0!

You know, the power of 1.5 at the beginning tore a big hole in the chest of the black-haired corpse ghost! Although this 2.0 may not be able to cut bones, it is enough to severely injure the black-haired corpse ghost!

The speed and distance have also been improved, which makes the Yinfeng Blade easier to hit.

The most important thing is that with the increase of the charging time, the power of the Yinfeng Blade can grow rapidly, and finally reach an astonishing value of 9.5!

The power of 9.5! Chu Xiu didn't dare to think how horrible it would be. When a bunch of zombies crowded in the corridor, he could probably cut several of them in half at once!

The newly upgraded Yinfeng Blade plus the Bone Bloodthirsty Formation, as well as the +6 Bone Armor, gave Chu Xiu the confidence to take risks!

Of course, his preparations did not stop there.

As early as during the day, Chu Xiu had made backup preparations in advance.

In the camp, there were many potentially useful supplies found by the crowd in the process of searching in various rooms.

Among them, there was a climbing rope with a length of 60 meters.

The tensile strength of this rope would not be less than 1600kg. Although thirty years have passed, thanks to the high-density nylon material it uses and its good preservation, it still has good physical strength.

Chu Xiu used it to make a simple sliding device, the top of which was fixed to the upper floor with nails. The two ends of the hanging device were connected to a very heavy wooden sofa on the edge of the balcony, and the other end was tied with a knot that could be quickly retracted.

If he really encounters a critical moment, Chu Xiu can self-destruct the unformed soul in the white bone ghost banner, temporarily delay the enemy, put the knot on himself, and then kick the sofa off the balcony, and he can quickly rise and get away under the action of gravity!

Even if the opponent catches up, he can force the people in the stronghold to come as combat power and cannon fodder.

It is precisely because of so many preparations that he has the confidence to take risks!

After going through all the plans in his mind and making sure that there are no omissions, Chu Xiu took a deep breath and officially started the hunting operation!

With a flip of his wrist, the white jade-like bone spear appeared in his palm. Chu Xiu lowered his body and shuttled in the dark night, like a ghost hidden in the shadows.

His attention was highly concentrated, and all the movements around him were taken into his ears. Suddenly, Chu Xiu's expression moved, and when he passed the stairwell, the bone spear in his hand suddenly stabbed out!

At almost the same time, a black-haired corpse ghost rushed out from the corner!

A pair of scarlet eyes came into Chu Xiu's eyes.

His heart suddenly jumped!

Compared to the daytime, the black-haired corpses at this time exuded a crazy aura, just like the high-risk patients who had lost their minds in a mental hospital. They were as ferocious as wild beasts, but they were more fearless of pain than wild beasts. It seemed that all emotions had disappeared, leaving only the desire for destruction in their scarlet eyes!

"Puff!"

The sharp bone spear penetrated the corpse ghost's chest, but it seemed to be unaware, roaring and waving its claws, directly attacking Chu Xiu's face!

"Kaka!"

Two sharp claws hit Chu Xiu's shoulder hard. If this was the first time he met a ghoul, this blow would probably break his shoulder blades!

But at this time, Chu Xiu only shook slightly, and at the same time, he kicked out his right leg like thunder, hitting the corpse in the belly. The huge force kicked the monster directly away.

It just stabilized its body, and Chu Xiu had already strode to catch up. A spear pierced its eye socket and pierced its head!

"Crack."

[Slaughter creatures, professional experience +39]

"oh?"

Chu Xiu raised his eyebrows.

At night, the experience of these corpses increased by about 20%.

Although it’s not a huge amount, it’s still an unexpected surprise.

"However, this extra experience is nothing compared to the enhancement of the ghoul."

Chu Xiu frowned again.

No matter how much information he obtained before, it was only a rough estimate. Only after fighting in person could Chu Xiu have a quantitative feeling.

He could clearly feel that compared to the daytime, the power of this ghoul had increased by nearly 50%! And his movements have become faster, as if he has suddenly transformed from an ordinary person into an athlete who has been training for a long time.

"If I'm surrounded by such corpses, it will be too much for me if four or five of them come together."

At this time, the screams of the corpse had already sent the entire apartment building into a frenzy!

"Ta-ta-ta-ta!"

In the dark night, the sound of countless hurried footsteps sounded clearly in Chu Xiu's ears, as if there were countless huge spiders crawling towards him!