Upon hearing the question, Du Chen Immortal King and Ji Ming Immortal King from the Celestial Pavilion looked over in surprise.

"You don't think this person found the entrance through some special method, do you?"

"This is clearly a wild guess."

"With a fifty percent chance, it's quite easy to guess correctly."

The two spoke through transmission, so Brother Cheng didn't hear it.

However, Miao Yu felt things weren't that simple, and she was becoming increasingly attentive to Sect Leader Jiang.

The team of twenty continued forward, and six days later, they encountered a new challenge.

Brother Cheng was quite accustomed to it. It seemed like each realm had different checkpoints.

Moreover, he also discovered a pattern; each checkpoint was actually a test of a certain rule.

For example, the first checkpoint tested the Power Rule.

The second checkpoint, which involved three cities in a row, tested the Illusion Rule.

In such checkpoints, having a group of people teaming up had a definite advantage.

Even if one's understanding of that rule wasn't deep, the strength of the group could make up for it.

In front of them, the scene was a massive circular arena.

Aside from the empty stands surrounding it, the combat area spanned over a thousand miles in diameter.

As usual, no one could activate their Immortal Country.

Everyone looked around, cautiously releasing their Immortal Soul to probe every corner, but there were no special findings.

"What rule will this checkpoint test?"

"Could it be the Rule of War, making us enter the arena for combat?"

"It's possible!"

"But, there are no opponents here."

A few Immortal Kings had already entered the massive arena, but nothing happened.

"Surely, it won't make us fight each other?"

"What's that?"

Miao Yu suddenly pointed to a corner of the arena, where a few colorful butterflies were fluttering.

These butterflies were very small, only the size of beans, and were almost transparent.

Counting carefully, there were five in total.

Just moments ago, when they had scanned the entire place with their Immortal Souls, they hadn't discovered these five butterflies.

Du Chen Immortal King stroked his beard and concluded solemnly, "This challenge should be related to these butterflies."

The others also agreed one after another.

This was obvious; a few butterflies appearing in this dead silence was too unusual.

Xiao Kun Demon King frowned and asked, "So how do we pass? By killing these butterflies?"

As he said this, he couldn't help but look at Sect Leader Jiang, seeking his advice.

Brother Cheng, being here for the first time, didn't know a thing.

But seeing Xiao Kun looking at him with such expectation, he had to at least make a gesture.

So he raised his hand and swung a sword towards the butterflies.

"Don't..."

Miao Yu hurriedly tried to stop him; many checkpoints couldn't be recklessly attacked.

If those butterflies were the key clues, destroying them would be a disaster.

But, it was already too late.

Bang!

A surging Fire Dragon roared through the area, sweeping everything before disappearing in an instant.

The crowd thought, brother, you're a bit too direct, aren't you?

But looking back in the arena, those butterflies were still there.

And at some point, hundreds more had appeared.

The colorful butterflies fluttered, dancing in the arena, appearing beautifully enchanting.

"Could it really be that we need to exterminate these butterflies?"

"It might be!"

"Then let's all make our move together!"

This time, Miao Yu had no objections, so everyone flew to the sky.

They unleashed their respective ultimate techniques, bombarding the arena wildly.

The stance was practically a carpet bombing.

If it weren't for the special nature of this arena, it would have long been destroyed.

They bombarded for a full minute before gradually stopping, staring dumbfounded at the billions of continuously fluttering butterflies before them.

Even the slowest among them now realized.

These butterflies seemed to multiply because of their attacks.

If they didn't attack, there would be fewer of them.

Well-traveled Du Chen Immortal King sighed, "We might have made a mistake. These butterflies likely use our attacks as a source of nourishment."

"That's why they multiply so much."

In the outside world, such a thing would be unbelievable, but within the Immortal Tree, anything could happen.

"So... what do we do now?"

Looking at the dense butterflies, everyone felt a headache coming on.

Miao Yu remained silent; she quietly observed the chaotic dance of the butterflies, her Immortal Soul seemingly scanning every detail.

No one knew how long it took, but just as everyone was at their wit's end, she finally had a discovery.

"Among these butterflies, there's one that's not colorful but transparent and colorless."

Everyone, being Immortal Kings and Demon Kings, immediately remembered.

Indeed, among the initial five butterflies, there was one that was colorless, but at the time, everyone hadn't thought it was special.

Now, with Miao Yu's reminder, as they looked again, they found that among the billions of butterflies, there was every color except there was still only the one colorless butterfly from the start.

Only they could do it; if it were anyone else, finding a single colorless butterfly among billions would be impossible.

"That's right! It seems it's the true key!"

"But shouldn't our earlier attacks have hit it?"

"Yeah, earlier my attack covered the whole area; it couldn't have escaped!"

"No!"

Miao Yu shook her head again, a spark of wisdom shining in her eyes.

"Look at its erratic flight path, it's like it's instant teleporting."

"If I'm not mistaken, catching this colorless butterfly will allow us to pass."

"This test is on the Speed Rule!"

Her analysis suddenly enlightened everyone.

"As expected of Miss Miao Yu, truly intelligent!"

"Indeed, with her around, no puzzle is unsolvable!"

Once again, Brother Cheng elegantly became a side character.

No way around it, besides showing off, he wasn't very focused on other things, while Miao Yu was exceptionally focused and intelligent.

"It's a pity there are too many butterflies now, which makes it quite a disruption."

"Let's give it a try!"

After confirming this was a Speed Rule test, everyone was eager to get onto the field to catch the butterfly.

Then, Brother Cheng directly activated Time Reversal.

Recently, having used this skill frequently, he found it very suitable for showing off.

In the next instant, time rewound to the moment they first entered the arena.

At this point, the arena was empty, and everyone was searching for clues.

Brother Cheng flew into the arena alone, and then five butterflies appeared.

He clasped his hands behind his back, lifted his chin slightly, and lightly coughed.

"Alright, no need to search aimlessly, the clue is right here."

"Ah?"

So quickly?

Upon hearing this, everyone rushed over, including Miao Yu.

"What did Sect Leader Jiang find?"

"Five colorful butterflies?"

"This really seems like a clue."

"Sect Leader Jiang has such sharp eyes!"

"To notice something unusual right upon entering!"

Brother Cheng, not blushing or gasping, continued to 'educate' everyone.

"These butterflies can't be attacked."

"Ah, why?"

"Could it be that killing them cuts off the clue?"

"No."

"The reason they can't be attacked is that they can turn our attacks into nourishment."

Sect Leader Jiang gravely warned everyone.

To prove this point, he lightly flicked a finger towards one of the butterflies, and that butterfly immediately turned into two.

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