It took half an hour for Ye Kai to come to the outer wall of the Shadow Castle at noon.

As prompted by the system, in the first 10 minutes, the defense of the castle perimeter was quite lax, so Ye Kai controlled Ye Wuxian to pass through four lines of defense and one patrol.

But as the relaxation period passed, the shadow city wall was obviously not far away, Ye Kai still took nearly 20 minutes to come to the bottom of the wall, and the two sneaks in the middle were almost investigated, fortunately, the assassin in the stealth state also had a [stun] skill that could stun people, Ye Wuxian first fainted people and then ran away without breaking the concealment, and finally escaped this catastrophe.

The first half of the second entrance to the Shadow Temple had passed, and Ye Kai wanted to use the assassin's stealth or a more powerful [Invisibility Cloak] to enter the first floor of the castle, but the two guards at the gate of the Shadow Castle had a pair of blue virtual eyes above their heads.

Normally, no one can see this eye, and it will only work if a stealth creature is close to it, as the Eye of Void is specifically designed to detect stealth.

"It's not neat."

Ye Kai, who was leaning on the bed pillow, muttered: "Although there are only two guards at the castle gate, every minute a team will patrol in or out, and the guards are less than 15 yards apart, as long as one of the guards finds the enemy, the other will follow." ”

"Hmm...... The two guards can barely deal with it, and once the battle lasts more than a minute, the patrol team will come in and out, and it is a big deal that they can't see the guards around them. ”

Turning the perspective, Ye Kai looked at the surrounding scene, the Shadow Castle was flat and flat, there was no terrain that could be used at all, plus more than thirty yards away was the sentry defense line of the Shadow Creature Trace, Ye Wuxian's range of activities was quite limited, to sum up, the probability of his success in entering the first floor of the Shadow Castle from the main entrance was almost zero.

"Xiaoqi Xiaoqi, have you come back?" Ye Kai tried to call his mobile phone butler again, but no one answered.

At this time, the elf Xiaoqi was surrounded by a group of enthusiastic tigers, and naturally he couldn't hear the call of the master.

"This cowardice, the chain fell at a critical moment...... Now I'm left to figure it out on my own. ”

Giving up the idea of asking for help from the sidelines, Ye Kai began to observe the Shadow Castle again.

Controlling Ye Wuxi, Ye Kai turned around cautiously, he had the experience of jumping the window of Thuram's house, Ye Kai wanted to jump out of the window again, but unfortunately, there were two closed ventilation windows on the second floor of Shadow City, and the stone wall on the first floor was smooth and windowless, so he didn't even have a chance to climb up.

"Rub, this is a competition."

Ye Kai took a deep breath and looked up at the window on the second floor, although the square window was only a dozen yards away from the ground, it was impossible to go up just by jumping, Ye Wuxian did not have the flashing technique of the mage department, unless he ......

"Unless there's a person standing at the window on the second floor, and then I'll walk up through the shadows."

In the second half of the night, the wind gradually rose, and the wind after the autumn was cold and swishing, who was not overconfident in his body, how could anyone take the initiative to open the window?

Frowning, Ye Kai thought for a while and thought of an unsafe idea.

Since no one took the initiative to open the window, he wanted to hook up with the people inside to open the window.

"Try it, if you can't do it, you can only wait for Xiao Qi to come back."

After making up his mind, Ye Kai opened Ye Wuji's backpack, pulled out the assassin's long-range throwing knife weapon, adjusted the perspective upwards to aim at the square window, and took out the knife!

"Bell"!

The knife was slightly off and hit the exterior wall by the window.

"Use a flying knife without a target, and the assassin is not a long-range profession...... "Seeing that no one noticed, Ye Kai shook his head, and drew the correction direction for the second time, and Ye Wuxian took out the knife!

"Bell"!

The knife was still a little off, and a shadow sentry rushed to hear the sound, and the shadow sentry wall wandered around for a while, sniffing with the tip of his nose, but he didn't notice anything abnormal, and he returned to his original position after a while.

"No insurance is no insurance." The human shadow thorn blade, which was 23 yards away, spoke silently.

"The last time, if you don't succeed, you will wait steadily!"

Back to the root of the wall, Ye Wuxian drew the knife for the third time to adjust the angle, and the two failures turned into experience, Ye Kai looked at the crosshair on the three-dimensional projection, which was sometimes large and sometimes small, and clicked to launch!

With a "poof", the flying knife finally pierced the wooden square window, and there seemed to be movement in the window.

"Hum"~

Ye Kai added a swift wind step, and the human shadow stabbed the breeze under his feet.

"If it's an ordinary monster that opens the window, it's a shadow step directly, and the boss will flash immediately."

The square window trembled, and the people inside seemed to be trying to open the window, but unfortunately, the shadow sentry on the other side once again discovered the movement of the wall root, the red eyes were puzzled by the color, and the shadow sentry twisted his dark blue big ass and moved in the direction of Ye Kai.

"I'll go!" On the big bed, the upper part of the body made a sound, looked up, turned his head to look, and moved sideways without a trace.

The limit distance for safe sneaking is 20 yards, and the casting limit of Shadow Step is also 20 yards, so there are a number of steps that Ye Wuxian can move.

Open the window, open the window, open the window!

Open the window, open the window, if you don't open it, I'll have to run!

At this moment, "squeak", the square window parted left and right, and a cloth-robed shadow creature with the name of "Shadow Alchemy Apprentice" poked its head out and looked down.

"It's not a boss!"

As soon as the black pupils condensed, Ye Kai instantly exploded his hand speed, and the target clicked on the shadow to step up, followed by a faint attack!

I saw that the translucent human shadow thorn on the projection suddenly disappeared on the spot, appearing behind the alchemy apprentice's head, the single dagger held the dagger tail back, knocked on the back of the shadow apprentice's head, and the 2-second vertigo circle turned around!

Two seconds later, the alchemy apprentice woke up, he had no idea what had just happened, especially remembering, a throwing knife stabbed the window of the alchemy laboratory, he came to check, and there was only one sentry under the window.

"#*&#......" the alchemy apprentice snorted.

Hearing this, the shadow sentry shrugged his shoulders and replied with a whining that no one knew what the two shadows were communicating, but neither of them seemed to get the answers they wanted.

The alchemist closed the window, and the shadow sentry returned to its original position.

At this time, the human shadow thorn in the stealth state was standing against the wall at the other end of the house, and seeing that the upper and lower shadows did not find anything, Ye Kai breathed a sigh of relief.

The shadow apprentice who closed the window scratched his head and thought for a while, and finally gave up after confirming that he couldn't figure it out with his own intelligence.

It was a room of about forty or fifty square meters, with two walls covered with all kinds of books, and in the center was a large square table filled with colorful potions.

"This is the alchemist's laboratory." After reading it, Ye Kai said certainly.

However, the shadow apprentice was still wandering, Ye Kai didn't dare to act rashly, after all, it was the second half of the night, and the apprentice in charge of guarding the laboratory yawned for a while, and after holding on for another five minutes, he went to sleep in the next room.

"Finally gone." Ye Kai's heart was completely relaxed.

It was easy to enter the Shadow Castle, Ye Kai had no intention of studying the alchemy of the old dark family, and was ready to go downstairs to take a look.

Xu is a great contrast between nervousness and relaxation, Ye Kai missed when he clicked the arrow key, so that the human shadow thorn accidentally touched the magic lamp hanging on the wall.

"Smack"!

Before he was worried about the movement of the heavy object falling to the ground, the magic lamp suddenly turned 90 degrees to the right, and the bookshelf behind Ye Wuxian opened.

Hint: You have discovered the Secret Passage.