On the second floor of the Shadow Cave, Zhao Tianhe collapsed to the ground sweating profusely.

As Zhao Tianhe thought, with ten points of strength, he can indeed crush the first and second layers of monsters, but the problem is that there are too many monsters, right?!

"The number of these two floors is at least double that of yesterday, right?" Zhao Tianhe hammered his shoulder, frowned and took a saliva.

"yes, that's not right! Then again...... There won't be elites on the third floor, right? Rhaenys said with a look of fear.

"Hmm...... Let's summon Saber in a moment. Zhao Tianhe was also afraid of this, and sighed and said. Today, these five silver coins are considered to be in vain. ”

"Not really, right? If there is only one third floor, with Miss Saber's strength, it should be able to be done in ten minutes, and if you hurry up and run out, it will take about ten minutes to reach the slime cave at the top speed of the flying boat, and we will have at least half an hour or more to clean up the slime cave to our heart's content! Rhaenys calculated.

"Let's try, but it's better to have no elites on the third floor." Zhao Tianhe nodded.

But unfortunately, there are not only elites on the third floor, but also two!

Looking at the two caveman warriors with big shoulders and round waists, Zhao Tianhe summoned Artoria directly without saying a word!

However, under the crushing of Artoria's strong strength, it only took eight minutes to clear the entire third layer.

After knowing the plan of the two, Artoria nodded and didn't say much, and directly picked up the two of them one by one and rushed out of the dungeon on their shoulders!

"This is the Flying Boat?" Artoria looked at the speedboat in front of her, with eight magic props with metal brackets for take-off and landing at the bottom, nodded and threw the two of them up, took out a lunch box from the back basket on the boat, and activated the magic array of the flying boat while eating.

"Uh-huh, show the way." Artoria swallowed her meal and commanded the ship to take off with her mind.

"How do you drive this?! Although this thing is a mind-controlled civilian fool type......" Zhao Tianhe asked in surprise.

"Hmph, do you think what you see is all my strength?" Artoria picked up another bag of meat buns and said as she ate them. "Riding skills are a ...... The inherent abilities of this knight! ”

Although he was a little surprised, Zhao Tianhe still obediently showed the way.

Five minutes later, the flying boat landed in front of the Slime Cavern at full speed.

"Huh?" Pixie looked at the slime cavern, tilting his little head and frowning. "Something seems wrong here......"

"Then, I'll leave the food to the Pixie elves!" Although Zhao Tianhe heard her words, he didn't take it seriously, and rushed into the cave with a casual hello.

However, as soon as he entered the door, he realized that something was wrong!

"Discolored?" Zhao Tianhe looked at the several stone pillars on the first floor of the open space and the surrounding walls, and found that everything was showing a faint crimson. "The temperature has risen so dramatically, what's going on?"

Not only that, but the original ordinary slimes have also turned into red fire attribute slimes at this time, and their volume has also become larger.

"Rush! Miss Saber! Lenys hadn't been to the Slime Cavern before, but thought it was like that, and shouted at Artoria with a positive face.

And although the latter knew that the first layer was not like this, she didn't care about this change, and she rushed directly in one go, and all the slimes were slashed and exploded all over the sky by her.

Seeing that the two of them were about to rush into the second floor in one go, although Zhao Tianhe felt a little bad, he had to keep up, and at the same time carefully thought about what was going on in his mind.

Is it related to yesterday's dungeon mutations?' Such a huge change, how can it feel a bit like the rarest dungeon upgrade situation...... 'Zhao Tianhe has also been in the Hero Academy for so long, and he is still somewhat knowledgeable, he has seen this situation in books.

Dungeon upgrades are anomalous changes caused by changes in the leylines. The most significant phenomenon is that the environment of the dungeon will change significantly, and the monsters will also be greatly strengthened, which is almost exactly the same as the situation on the first floor of the Slime Cave!

'I see, is the anomaly in the nearby dungeon due to the upgrade of the Slime Cave?' Zhao Tianhe suddenly figured out what the abnormal situation was yesterday and today, but the question is, why did the Slime Cave upgrade?!

Moreover, once the dungeon is upgraded, it means that there will be a dungeon boss 100%!

“saber！ Lenies! Listen to me! Zhao Tianhe stepped forward and told the two of them about the current situation.

"What a chance!" Rhaenys' eyes flashed when she heard this! "There will be a boss when the dungeon is upgraded, but only the dungeon boss of the pre-upgrade level will appear! Change here, that is, the most rubbish F-class dungeon boss! And as long as it's a boss, there will definitely be high-quality equipment and even boss equipment drops! ”

Boutique equipment and boss equipment are unique drops of dungeon bosses, among which boutique equipment may be able to hit one out of thousands of elites, but boss equipment can only be dropped by boss, and it will definitely be attached to extremely powerful special attributes!

"With Miss Saber's strength, it may be difficult for an E-level dungeon boss, but F-level is absolutely fine!" Rhaenys said with great certainty, as she had seen F-class bosses.

In fact, the upper limit of the strength of the boss is linked to the level of the dungeon, but the lower limit is not, which means that the E-level dungeon may also spawn the F-level boss, and the chance is not small. When she was in the Brave School before, Rhaenys had surrounded and suppressed the F-class boss under the leadership of the teacher in the school's internship class.

"In that case...... Go all out! saber！ Zhao Tianhe weighed the pros and cons, and finally gritted his teeth and shouted.

"Yes! master！ Artoria nodded solemnly, and rushed into the depths of the cave with the strength of her feet!

Along the way, various elite slimes appeared frequently, but most of them were not Artoria's enemies, and after a full twenty minutes, Rhaenys and Zhao Tianhe were both promoted to one level and did not encounter anything enough to stop the three of them.

"There are a lot of mutant elites...... Thirty of them were killed, right? Will this be the case with dungeon upgrades? Zhao Tianhe recalled the information in his mind and glanced at Rhaenys.

"It must be because there are already a large number of elites here, right? However, there are still twenty-one minutes left, and there is no obstacle on the way back, and the time is in time. Leenys thought about it, looked at the timer on her sleeve again, and said excitedly. Anyway, there are five minutes left and we don't meet the boss, how about we retreat? ”

"Hmm...... It seems that it is not necessary. Zhao Tianhe stopped, swallowed his saliva, and waited with a long sword in his hand.

Not far away, Artoria also raised her holy sword in a rare posture.