First, use Copperhead's new venom on people, so that when the second level of the game begins, they can be exposed to the laughing gas, making the timing of their death controllable.
Moreover, this poison seems to ignore individual physical differences, likely attacking the mind. Thus, the most lethal component is probably the laughing gas.
After analyzing the effective conditions of the venom, which are the combination of Copperhead's new venom and Joker's laughing gas, the antidote is naturally derived.
Batman knows the Hall of Justice has disappeared, and interrogating Copperhead now won't yield the antidote formula in time to concoct it.
The only option is to counter Joker's laughing gas.
It's undeniable, over the years, Batman and Ah Fu aren't confident with other toxins, yet with laughing gas, they've encountered it too many times and have successfully countered it numerous times.
Batman has Joker's blood, which means he possesses the Dionysus Factor, the foundational material for the laughing gas. He just needs to research the antidote based on this.
There are many types of Joker's laughing gas, and Batman's counter-laughing gas antidotes number over a dozen. He can use the Bat Plane, return to the Bat Cave, bring the antidote, spray it, and it's done.
There is enough time.
After using the laughing gas antidote, the poison within these people will lose half of its components, leaving only Copperhead's venom, making it no longer lethal.
As long as they don't inhale laughing gas in the future, they'll be fine.
It's like a shack with two pillars; removing one collapses it.
Batman is someone who always executes a plan with determination; he thinks it, and he does it.
Soon, like a Bat spreading its wings, the aircraft comes and goes, and Batman manages to slip out of the door with a Bane-style gas filter on his back.
The problem now is how to gather all of these Smiling Men together, rather than having Batman go around the museum capturing them one by one.
There are over a hundred people; even if it takes three seconds to find each one, the remaining time is insufficient.
However, Batman wasn't idle while waiting for the aircraft to deliver the antidote. He noticed and summarized certain patterns.
Sound and light.
The museum is the only illuminated place nearby, and Joker had set up various noises here, turning it into a chaotic marketplace offering free drinks.
Yet after releasing these madmen, Batman noticed that the speakers in the corridor, which kept playing laughter, had stopped.
He understood: Joker hypnotized these people, making them drawn to light like moths and sensitive to sound like bats. That's why they kept wandering in the museum.
Without light outside, they wouldn't leave; and by following sounds, they sought Batman.
When Batman fought, he used solid and direct Kung Fu. The moment someone got hit or fell, everyone would follow the sound to find Batman.
However, the game is the game; once he finds the key to clearing it, he can utilize it.
Batman directly pulled out one of Joker's speakers, casually took a bat battery from his belt, which was stronger than six regular ones, connected it to the speaker, making it emit a piercing noise.
Then, he took the gas filter from his back, hung it on the ceiling of a hall, and set up the Bat remote bomb.
As these Smiling Men rushed in seeking Batman, hidden in the ceiling's shadow, he detonated the small explosive, filling the enclosed room with black antidote gas.
The smiles on all the Smiling Men's faces gradually faded; this ultimate anti-laughing gas method, combining all types of laughing gas antidotes, was effective.
However, perhaps due to side effects, once they got serious, they all fell unconscious.
Batman checked a few individuals to ensure their vital signs were stable, then retraced his steps and found the third room.
The second level was tougher than the first. Who knows how many more levels Joker had prepared for him, and he had no way out.
Batman adjusted his breath, completely blocking out the nerve screaming in pain, and stepped into a darker place.
................
Mars, Shianna Valley, now.
In Martian, Shianna is a sacred word, meaning the 'Place of Inheriting Ancient Glorious Memories.'
Of course, as Su Ming would put it in the Celestial Dynasty's vernacular, Shianna means 'ancestral tomb.'
Ron looked up, gazing at the towering giant stone wall amidst the ruins. This was the entrance to the tomb passage, its exposure to the harsh environment of time leaving it revealed on the surface.
Fortunately, the enormous rock serving as the tomb door remained unbreakable, its eroded and smoothed surface etched with the vast 'Transcend' symbol, much like the current Hall of Justice's projection.
"This place...was once the most sacred location on this planet, with no non-Martian ever reaching here. If my race, my friends, the Justice League knew...me bringing you here demonstrates my trust in you exceeds others."
The Green Martian extended fingers like withered branches, caressing the hard stone wall, and felt the past Martian civilization.
"That only proves you trusted the wrong person, your journey ends here."
Walking behind him was indeed Luthor, clad in high-tech armor, pressing a Photon Beam Gun against Ron's head.
The fierce wind swept across the desert, blurring their footprints, while the weapon in Luthor's hand restrained Mars People, and a smile appeared on his face.
Ron calmly gazed ahead, not turning back at all: "You must remember I once brought you here, I believe you won't kill me."
"What trick are you up to now? My armor projected a field matching your mind frequency, your telepathy has been nullified, along with your transformation ability being suppressed."
Luthor had been skeptical throughout this journey, he hired Lady Vico to contact Batman but received no news, while Ron actively contacted him before that and invited him to a meeting at a coordinate on Mars.
Thanks to Brainiac's assistance, the two super geniuses swiftly modified equipment to fully counter Ron. Actually, Luthor hadn't disclosed that his Anti-Ron Armor was also equipped with a flamethrower and incendiary bomb.
Feeling assured of success, Luthor came alone, confident that with preparation, no alien could match him.
However, upon arrival, he saw Ron immersing himself in memories of the past, using his mind ability to manifest his deceased wife and children, relishing fake happiness with old phantoms.
The meeting place happened to be Ron's weathered home, precisely its remnants.
Ron stated he had no hostile intentions and invited Luthor here not for a duel, but to take him somewhere with fearsome answers.
Luthor was more than willing; he longed for additional intelligence anyway, and Ron indeed learned something from the Sena Gang, even bringing it right to him.
So in a bizarre atmosphere, through vast wilderness and ruins, they walked for a long time until they reached here.
Not unexpectedly, Luthor wanted to turn faces, Ron led him to the critical location, like putting a vault in front, what to do next was pretty clear.
A giant transcendence symbol was displayed on the stone wall, unmistakably here, and just a mere stone wall, destroying it with the Door Key would surely allow entry.
Just as Ron mentioned earlier, not Mars People's kin, friends, or those fools in the Justice League knew he invited Luthor.
This means if Luthor successfully kills Ron, he would gain tremendous strategic advantage.
Telepathy and global communication, these truly troublesome abilities.
Weakening the enemy equals strengthening oneself; without Ron, a girl like Megan can't be a presence. Even with a remaining mollusk? That thing's mind isn't even stable.
Luthor wouldn't hesitate to kill anyone for a noble purpose.
Despite Ron saying, "I am your friend, we met as children."
Luthor furrowed his brows, his smooth forehead squeezed out a few lines: "Is this your last words? Or your means of begging for mercy?"
"No, I'm telling the truth, I regained past memories." Ron turned to face Luthor, his red eyes fixed: "You can't recall me, maybe your memory is being blocked, I can help you remember, everything can help you understand what Papetua truly is."
The roaring wind dispelled the silence between them, and Luthor intensely stared into Ron's eyes, then gradually lowered his gun.
"... You have five minutes."
.............................
Time rewinds a bit.
"No! Barry, listen, you must keep us together, don't separate us!"
Within the Bullet Time Domain, Barry carries Deathstroke on one shoulder, Megan on the other, fiery flames nearby seemingly frozen in air.
However, concerning Barry's proposal to scatter and rescue people after leaving the nuclear blast range, Deathstroke clearly disagrees.
"Why?" Barry knew Deathstroke wasn't so harsh and extreme, past experiences indicate when he speaks, there's definitely a reason.
Cindy held the Nightfall Giant Sword, secretly rolling her eyes. Concerning the reactor leakage at the Hall of Justice, it was mere dirty bomb pollution and wouldn't explode.
Now the place called the Hall of Justice is blown sky-high, implying enemy infiltration.
If they could sneak into the Hall of Justice, it implies full acquaintance with superpowers and The Flash's abilities, meaning knowing a nuclear bomb couldn't kill them.
This is taking Washington, D.C.'s civilians as hostages, forcing heroes to scatter to save people!
Thinking is almost unnecessary; when Justice League heroes relying on team coordination disperse, they'll surely be defeated individually by enemies. Getting killed isn't scary, being captured is most troublesome.
'Heroes' acting in the name of justice are nearly all moral models; in life-and-death battles, fearing collateral damage's consequence goes without saying.
Earlier, Cindy optimistically felt earning money would be easy when contacting Su. However, just after the last contact, potentially almost eating a nuclear bomb? This money is extremely hard to earn!
Most critically, Barry, this naive fellow, hasn't even recognized her, let alone seen through enemy schemes, this kind of teammate, how did Su manage last time?
It's truly deadly.