Here's your scene with improved grammar, flow, and BTTH-style narration while keeping all of your plot points:
As Xiao Feng was thinking about how to counterattack and inflict real damage on Maple City and the Eight Gates Auction House, his expression gradually turned cold.
The Fire City faction could not afford to appear weak.
If they simply endured this attack without responding, others would begin to think that Fire City was easy to bully.
Sometimes, to warn the wolves, one had to kill a chicken in front of the monkeys.
Only then would others understand the consequences of provoking them.
As these thoughts circulated through his mind, time quietly passed.
A few hours later, more injured members arrived one after another.
Fortunately, there were no deaths.
This was entirely because Xiao Feng had previously distributed large quantities of Third-Rank and Fourth-Rank healing pills, Qi Recovery Pills, and Body Strengthening Pills to the important members of Fire City before they left.
Many people had considered it wasteful at the time.
However, during a true life-and-death situation, those medicinal pills had become priceless treasures.
Numerous members had managed to survive critical injuries because of them.
Although Fire City had suffered losses in resources, their casualties had been reduced to the minimum possible level.
Nearly ten hours passed in the blink of an eye.
Most of the elders and students had already left to rest.
Only a few people remained.
Xiao Feng.
Lin Xiuya
Grand Elder Su Qian.
And Fire Elder Huo.
At their cultivation levels, staying awake for a few days was not a problem.
Besides, both elders were extremely curious.
They wanted to know what kind of heavenly opportunity Xiao Li and Xiao Ding had encountered that allowed them to leap from the Dou Grand Master realm to the Dou King realm within such a short period of time.
The transformation was simply too abnormal.
Even the strongest medicinal pills could not normally achieve such a result.
Meanwhile, Xiao Feng already had a rough guess regarding the situation.
The white hair.
The depleted life force.
The abnormal increase in strength.
All signs pointed toward one possibility.
They had exchanged lifespan for power.
Thinking about this possibility, Xiao Feng immediately began making preparations.
If his guess was correct, then the most important thing right now was not increasing their cultivation.
It was restoring their lost lifespan.
Among the medicinal formulas recorded within his inheritance, there was one pill that perfectly suited the situation.
The Sixth-Rank Medicinal Pill—
Deep Green Longevity Pill.
A rare medicinal pill capable of increasing a person's lifespan by nearly ten years.
However, each person could only consume one pill during their lifetime.
The required ingredients were also extremely precious:
Deep Green Fruit.
King Longevity Starch.
Ten Thousand Year Vine.
Any one of these ingredients would cause countless experts to fight over them.
Fortunately, Fire City's intelligence network had expanded greatly during the past year.
Finding information about these ingredients was not impossible.
As he sat quietly beside the resting Xiao brothers, Xiao Feng began calculating the refining process in his mind.
With his current alchemy skills, successfully refining the pill was not difficult.
What he truly wanted was perfection.
If he could refine a Perfect-Rank Deep Green Longevity Pill and successfully produce Pill Patterns, the medicinal effects could increase even further.
According to his estimates, a perfect pill might increase the lifespan gain from ten years to thirteen years.
If several refinements succeeded and he obtained a high-quality result, the total lifespan increase could possibly reach sixteen years.
Sixteen years.
For ordinary people, that was an enormous amount of time.
For cultivators, it was enough time to completely change their fate.
As long as Xiao Li and Xiao Ding could break through to the Dou Huang realm before exhausting their vitality, their lifespan would naturally increase once again.
At that point, the hidden danger would largely disappear.
Thinking of this, Xiao Feng finally relaxed slightly.
His gaze landed on the sleeping Xiao Li and Xiao Ding.
No matter what price they had paid to obtain this power, they were still his brothers.
And as long as there was a solution, he would find it.
The room gradually fell silent.
Only the sound of breathing could be heard.
Yet beneath that calm atmosphere, everyone knew that a storm was slowly approaching.
Maple City.
The Eight Gates Auction House.
Han Feng.
Yuan Yi.
Sooner or later, Fire City would settle this debt.
Seeing that Xiao Feng remained calm despite the tense atmosphere and was quietly writing down several medicinal ingredients on a piece of paper, Fire Elder Huo could not help becoming curious.
The old man's gaze swept across the list several times before finally asking,
"Little fellow, what are you doing?"
Nearby, Lin Xiuya also noticed Xiao Feng's unusual behavior.
Among everyone present, he understood Xiao Feng's personality quite well.
If Xiao Feng was calmly preparing something while his two brothers were lying unconscious nearby, then whatever he was doing had to be extremely important.
Thinking this, Lin Xiuya moved closer.
Even Su Qian, who had remained silent until now, slowly walked over with curiosity in his eyes.
Seeing the three gazes focused on him, Xiao Feng finally put down the pen in his hand.
"I think I already know what happened to my two brothers."
The moment those words were spoken, everyone's expressions changed.
"You know?" Fire Elder Huo immediately asked.
Xiao Feng nodded.
However, instead of immediately explaining, he flicked his finger.
Three streams of Spiritual Strength entered the minds of Su Qian, Fire Elder Huo, and Lin Xiuya.
Within those streams was information regarding a medicinal pill.
Not the complete pill formula.
Only its name, grade, effects, and basic history.
Even so, Xiao Feng deliberately concealed the actual refining method.
A pill formula of that level was simply too valuable.
Once leaked, it would bring endless trouble.
Even though the Northern Region currently lacked an alchemist capable of refining it, Xiao Feng preferred being cautious.
After the three digested the information, shock immediately appeared on their faces.
Lin Xiuya's eyes widened.
Su Qian's expression became solemn.
Even Fire Elder Huo sucked in a cold breath.
"The Devouring Life Pill?"
Lin Xiuya spoke softly.
A trace of disbelief appeared in his eyes.
Soon, countless memories surfaced within his mind.
As one of the strongest geniuses of the Inner Academy and came from the central plans, he had naturally read many ancient records.
And among them was information regarding a notorious medicinal pill.
The Devouring Life Pill.
A miraculous pill that had once shaken the entire continent.
Its rank stood at the peak of the Seventh Tier.
The creator had been a renowned Seventh-Rank Peak Alchemist whose fame once spread throughout Zhongzhou.
The terrifying aspect of this pill was not its healing ability.
Nor was it its combat power.
Its true horror lay in a single effect.
It could forcibly create Dou Kings.
Mass-produce them.
The moment that information appeared in the world, countless experts had gone completely mad.
Dou King.
A realm countless cultivators could only dream of reaching.
Many people spent their entire lives struggling, only to remain trapped below that threshold forever.
Yet a single pill could allow someone to step into that realm.
Even if only temporarily.
Even if the price was severe.
People still desired it.
Because power was intoxicating.
And many were willing to pay any price for it.
"Back then, the entire continent was thrown into chaos because of this pill," Xiao Feng slowly explained.
"Many first-rate factions tried to obtain its formula."
"After all, if a faction possessed the ability to mass-produce Dou Kings, who could stop them?"
Everyone fell silent.
Even imagining such a scenario was terrifying.
An army of thousands of Dou Kings.
The thought alone was enough to make one's scalp numb.
Su Qian slowly frowned.
"But if such a pill truly existed, why isn't it known today?"
Xiao Feng sighed.
"Because its creator disappeared."
"Overnight."
"No one knew whether he died or was captured."
"Even the pill formula vanished together with him."
"The major factions searched the continent for decades."
"But they found nothing."
"As time passed, the Devouring Life Pill gradually became a legend."
"Eventually, many people forgot it ever existed."
Fire Elder Huo nodded slowly.
"I've heard fragments of this story before."
"But I always assumed it was exaggerated."
"Who would've thought it was true?"
At that moment, Lin Xiuya suddenly looked toward the unconscious Xiao Li and Xiao Ding.
His expression became somewhat ugly.
"If they really used the Devouring Life Pill..."
"Then the price they paid..."
Xiao Feng clenched the paper in his hand.
His voice became much quieter.
"Life."
Everyone's hearts sank.
"The Devouring Life Pill burns lifespan as fuel."
"The greater the increase in strength, the more lifespan is consumed."
"That's why their hair turned white."
"Their vitality has been severely depleted."
"The Dou King cultivation they possess now was purchased with years of their lives."
The room instantly fell silent.
Everyone finally understood why Xiao Feng had been writing down those medicinal ingredients.
He wasn't preparing for battle.
He was preparing to save his brothers.
Xiao Feng looked toward the sleeping Xiao Li and Xiao Ding.
His eyes gradually became firm.
"Fortunately..."
"I know a method to restore part of their lifespan."
He tapped the list of ingredients on the table.
"The Deep Green Longevity Pill."
"If I can gather these ingredients and successfully refine it..."
"Then there is still hope."
The gloomy atmosphere finally eased slightly.
Hope still remained.
And as long as hope remained, Xiao Feng would never give up.
Even after Xiao Feng finished explaining the origins of the Devouring Life Pill, the expressions of Su Qian, Fire Elder Huo, and Lin Xiuya remained somewhat confused.
Seeing their reactions, Xiao Feng could only explain more clearly.
"The situation isn't as bad as you're imagining."
"The Devouring Life Pill consumes lifespan and converts it into cultivation. That's why my two brothers were able to directly advance into the Dou King realm."
"They have paid a heavy price, but it isn't an irreversible one."
The three immediately focused on him.
Xiao Feng pointed toward the sleeping Xiao Li and Xiao Ding.
"Based on my estimates, after reaching the Dou King realm through the Devouring Life Pill, they only have around three years of lifespan remaining."
Hearing this, everyone's expressions changed.
However, Xiao Feng quickly continued.
"But that doesn't mean they only have three years left to live."
"As cultivators, our lifespan isn't fixed."
"The stronger the cultivation, the longer the lifespan."
"Many people only know that Dou Zong experts experience a significant increase in lifespan, but they overlook the fact that every major realm increases one's vitality to some degree."
"There is already a considerable difference between a Dou King and a Dou Huang."
Fire Elder Huo slowly nodded.
He naturally understood this.
Xiao Feng continued.
"If my brothers can successfully advance to the Dou Huang realm within these three years, their depleted life force will stabilize."
"Once they become Dou Huangs, the situation will become much easier to handle."
A trace of hope appeared in everyone's eyes.
Su Qian asked,
"And after that?"
Xiao Feng smiled slightly.
"After that, I can help them recover."
"I already have several plans."
"First, the Deep Green Longevity Pill."
"It can directly restore around ten years of lifespan."
"If I manage to refine a perfect-quality version, the effects may become even better."
"Second, once they reach the Dou Huang realm, I can prepare Earth Core Tempering Pills and use special body-tempering methods."
"Combined with certain opportunities involving Strange Flames, not only can they recover their original talent, but there is even a possibility that their aptitude may improve beyond what it was before."
The room fell silent.
Even Fire Elder Huo was somewhat stunned.
What Xiao Feng was describing sounded less like treating a side effect and more like completely rebuilding a person's foundation.
Seeing their shocked expressions, Xiao Feng shrugged.
"Fortunately, they consumed the pill while already being high-level Dou Grand Masters."
"If they had taken it at the Dou Master stage or at the lower levels of Dou Grand Master, things would have become much more troublesome."
"The amount of lifespan consumed would have been far greater."
"And I would have needed to spend considerably more effort repairing their foundations."
Lin Xiuya subconsciously swallowed.
Only now did he realize how fortunate Xiao Li and Xiao Ding truly were.
Xiao Feng continued calmly.
"Besides, they aren't without advantages."
"They are already Dou Kings."
"With their current foundations, I can provide them with Dou King Pills, Body Tempering Pills, and suitable cultivation resources."
"Their cultivation speed over the next few years will be far faster than normal."
"As long as they don't waste time, reaching the Dou Huang realm isn't impossible."
"And even if they somehow fail within three years..."
Xiao Feng tapped the ingredient list on the table.
"The Deep Green Longevity Pill will buy them another ten years."
"Ten years is more than enough."
The three listeners were completely speechless.
Especially Lin Xiuya.
He had only broken through to the Dou King realm a short while ago.
To him, advancing another major realm was a difficult task that would normally require many years.
Yet in Xiao Feng's mouth, it sounded like a problem that could be solved through proper planning.
Looking at the calm young man before them, they suddenly felt that Xiao Li and Xiao Ding were incredibly lucky.
Not only had they survived the Devouring Life Pill's side effects...
They also happened to have a younger brother who already possessed solutions to those side effects.
Just then, Su Qian suddenly thought of something.
His expression became strange.
"Wait a minute."
"How did you even think of all this?"
The others immediately looked toward Xiao Feng.
They were curious too.
Hearing the question, Xiao Feng scratched his head somewhat awkwardly.
"It came from one of my other master's inheritances."
"That inheritance contains a lot of information regarding ancient medicinal pills."
"I happened to come across the Devouring Life Pill before."
Fire Elder Huo nodded slightly.
That explanation was reasonable.
But Xiao Feng's next sentence nearly made them choke.
"When I got bored a while ago, I started thinking about ways to counter the pill's side effects."
The room became completely silent.
Su Qian blinked.
Fire Elder Huo blinked.
Lin Xiuya blinked.
"...You were bored?" Lin Xiuya asked.
"Yes."
Xiao Feng nodded naturally.
"I thought it was an interesting problem."
"So I tried finding a solution."
"Although it would still take me quite a long time before I can actually refine a peak Seventh-Rank medicinal pill, there's no harm in preparing the theory beforehand."
The three people stared at him as if he were some kind of monster.
When normal people had free time, they relaxed.
They fished.
They drank tea.
They listened to music.
They painted.
They played chess.
Some people cultivated.
Some people rested.
But Xiao Feng?
When he was bored, he apparently researched methods to counter ancient continent-shaking medicinal pills.
The gap between geniuses and ordinary people suddenly felt impossibly large.
After a long while, Fire Elder Huo helplessly shook his head.
Su Qian laughed bitterly.
Lin Xiuya directly gave up trying to understand.
Perhaps this was simply how true monsters thought.
The rest of them were probably never going to understand it.