1800 per second, compared to 10 seconds 700 per second when fighting a sand scorpion, the experience gain speed is more than twenty times more than the speed!

In other words, it takes more than a week to fight the sand scorpion before Chen Kai can upgrade from level 8 to level 9. When fighting the white silk spider, Chen Kai can upgrade to level 9 in just three hours!

Of course, the magic value of silk spiders is limited, so it is impossible to always supply white silk spiders.

So when the silk spider has dozens of magic points left, Cui Xisi asked everyone to stop and let the white silk spider kill Xiao Hei first, and then the silk spider comes up to eat the white silk and recover blood and blue, and then call Xiao Hei to start the second round.

Although it takes more than one minute for the silk spider to chew on white silk, the speed of the experience gain is about 900 points per second, and the effect is quite good.

And when five minutes later, the second silk spider joined the battle, and the speed of gaining experience increased sharply again.

Three hours later, when the number of silk spiders rose to 3, Chen Kai also rose to level nine.

"This upgrade speed is invincible!"

While sighing, Chen Kai added the twenty attribute points obtained from the upgrade to the spiritual attributes, and then converted them into power attributes.

"But if we come to spit silk spider again, we can only kill one."

Cui Xisi said helplessly: "Little Hei will be extremely limitless to carry three silk spiders. If there are more, there will be no way."

Although white silk spiders do not have any physical attack power, their attack speed is very fast. Even if they can only survive for 2 seconds, they can attack 6 times, and 2 seconds can cause 45 points of real damage.

The attack speed of the silk spider is nine times a second. In other words, the white silk spider spits out by the silk spider in one second can bring 315 real damage to Xiao Hei.

When three silk spiders come together, they will have 945 real damage per second, and 9450 damage per second.

Nami's protective water shield and healing water elf can only offset 4,000 damage in 10 seconds, so every 10 seconds, Xiao Hei's health will drop by 5,450 points, barely lasting for 30 seconds, allowing Cui Xisi's summoning skill to cool down.

If another silk spider comes, Xiao Hei will not be able to withstand it for 30 seconds, and the perfect balance will be broken.

"But it doesn't matter. Then we kill a few spiders, and you will resurrect and get a few more fresh forces to output, and compress the time to clean the white silk spiders into one second, so we can carry a few more silk spiders."

If the time to kill the white silk spider can be compressed to within one second, the damage of the white silk spider will be reduced by 80%. Xiao Hei alone can carry fifteen silk spiders, and the speed of experience can be improved...

"When you go back this time, you should learn a skill like a bone burying place that can summon corpses. It's true that your broken skill must be used to summon corpses, and it's useless at critical moments!"

Chen Kai smiled awkwardly. He had this idea before, but this kind of skills is pitifully few and the audience is too small. NPC stores do not sell this kind of skills at all.

Just when Chen Kai was depressed, the fourth spider came.

"A new spider is here!"

When he discovered the new spider Elegy immediately, he immediately greeted him. Of course, in terms of vision, he could not compare with Cui Xisi, who is a archer profession and Chen Kai, who has the Blue Light Eye, but who made him have nothing to do now? So Cui Xisi arranged to do a ward-keeping job.

"This is...the crypt spider, very good! Chen Kai, come, kill this one directly and use it to summon."

"good!"

Name: Crypto Spider

Race: Zerg

Level: Leader level

Level: 25

Power: 625

Intelligence: 0

Physical constitution: 0

Spirit: 0

Agility: 0

Health: 30000/30000

Magic value: 6250/6250

Physical Attack: 1250

Magic Attack: 0

Physical Defense: 0

Magic Defense: 0

Attack speed: 1 time/second

Movement speed: 10 meters/sec

The crypt spider is a 25-level leader monster. It is characterized by being invisible and good at killing with one blow.

Its first skill is called Revenge Raid, which is similar to Chen Kai's stealth. After using the skill, it enters the stealth state for ten seconds and adds 50% absolute movement speed. The breaking of the hidden attack within the duration will cause 100% real damage bonus of physical attacks. This damage can enjoy the critical effect, lasting for 30 seconds and cooling time for one minute.

In addition, the vengeance raid cannot be interrupted.

The second skill is naturally a fatal blow, which adds 10% critical hit chance and 250% critical hit effect.

The third skill is called lethal puncture. You can get a lethal puncture state every minute. When attacking in this state, you will get an additional 100% critical hit chance.

The fourth skill is wielding power, adding an additional 30% attack sputtering effect.

The fifth skill is a life-sacrificing attack like the Shadow Skeleton, which consumes 50% of the health and causes 10 times the damage on the next attack.

The sixth skill is the Spike Case, which is immune to and rebounds all damage within 5 seconds, and fires spikes with toxins to stun the attacker for 2 seconds.

The seventh skill is the ground-digging and piercing skill like the sand scorpion. It can teleport 20 meters underground (at the bonus of casting distance, it is now 44 meters) and stun enemies on the path, causing 1,000 real damage to it at the same time.

In the case of a fatal piercing of the revenge raid, if the crypt assassin can deal a breaking attack, it will cause 43,000 real damage. At the same time, under the action of the powerful awakening force, it will cause 85% sputtering damage to the enemy within a radius of 5 meters behind the target.

For more than 40,000 real damage at a time, except for lords above level 22 or other units with many physiques that can have more than this damage, most NPCs may be killed directly by the crypt assassin.

However, as long as you know the other party's existence in advance, there will be no problem.

After seeing the crypt spider through reconnaissance guards and sentry guards, Chen Kai prepared in advance.

Although the crypt spider is very threatening, its movement speed is relatively slow. This movement speed is completely invisible in front of Chen Kai's increasingly mature prediction technology. The figure of the crypt spider appeared in the field of view of the Blue Light Eye, and the next second, it was trapped in the white bone cage.

Then there are only two options left in the crypt spider, either using the attack that is enough to kill anyone in the Darkmoon Guard on the White Bone Cage, or resisting Chen Kai and his output until the White Bone Cage disappears.

The crypt spider chose to resist, and then he found that he could not withstand it - not to mention that the others, Cui Xisi, who had full firepower, approached five arrows in one second, and suffered more than 5,000 injuries in seconds. At his heyday, he could not withstand Cui Xisi's attack, let alone that he has used a life-sacrificing attack now.

So he used the spike shell in time and surrounded himself with the hard shell.

Cui Xisi, who couldn't stop, shot two arrows on the shell of the crypt spider, and was immediately reflected with two spikes. Not only did they not cause damage to him, they also resisted two attacks that happened to be critical.

"Hmph, I'll kill you later."

Cui Xisi said harshly, Chen Kai and the others stopped in time, she was the only one who could not stop because of the fast attack speed, and became the only person to be reflected, which made her feel very embarrassed.

Five seconds later, the crypt spider just removed the shell protection and was then inserted into the body by several arrows. At the same time, a vine drilled out of the ground and tightly bound it.

The crypt spider showed despair on his face - for two seconds of control, it would definitely not be able to hold on with less than 10,000 remaining blood...

After 3 seconds, Chen Kai changed 253 points of strength and 67 points of agility, and then used the Necrotic Resurrection to pull up the crypt spider.

Cui Xisi looked at the attributes of the crypt spider, then asked in confusion: "Huh? Why don't you just use pure power to add points, but add power and agility?"

Chen Kai said confidently: "This is the best ratio."

Cui Xisi looked disbelief: "How do you know that such a strange proportion is the best?"

Chen Kai explained: "Because it takes at least 100 agility to trigger a critical hit, I will not consider the critical hit here."

"If it's not considered a critical hit, the attack damage is nothing more than attack power multiplied by attack speed."

"My total attribute is 320 points now, and the equipment physical attack power is 30, and then I can list an equation to calculate it."

Cui Xisi was stunned: "Equation?"

Chen Kai reacted and explained with a wry smile, "Well... it is a special way of math calculation, you may not know..."

Cui Xisi raised her eyebrows: "I know."

This time, Chen Kai was stunned: "Do you know?"

"Yes, it's just an equation with unknown numbers."

Cui Xisi said: "I just don't understand how to make the equation."

Chen Kai looked at Cui Xisi half-believingly and then explained: "If I set the power attribute to x and the agility attribute to y, I can get two equations."

“xy=320.”

"Output value = (2x30)*(10.005y)."

"Integration gives the output value = (2x30)*(520-x)/200."

"Finally, the output value is obtained = [7800x*(505-x)]/100."

Cui Xisi blinked: "And what? How do you know what the maximum output value is?"

Chen Kai smiled and explained: "After listing the formula for output value, you will find that the one that really determines the maximum output value is the number ‘x*(505–x)’. This number can take the maximum value, and the output value can take the maximum value."

"So, under what conditions can this number reach its maximum value?"

Cui Xisi pondered for a moment, then suddenly realized: "When x=505-x, it is when x*(505-x) reaches its maximum value!"

Chen Kai nodded: "That's right, just like a square and a rectangle, when the circumference is the same, the square has the largest area."

"Awesome, were you a mathematician during your lifetime?"

"Is there any mathematician in this world..."
Chapter completed!