Leon was not someone who enjoyed torturing others.
Even though he had become a Devil in this life, possessed power, and set his true self free, Leon had not discarded certain bottom lines and habits from his time as a human.
Nearly twenty years of life as a Devil had made him a qualified Devil, but it had also made him someone who would not easily lose control of his emotions.
Therefore, even when facing an enemy, Leon usually only wanted to defeat them cleanly and efficiently. If he felt intent to kill, he would strike directly, killing them as quickly as possible rather than toying with them or seeking pleasure from their agony.
This was the moral boundary he once held as a human. Even if he needed to kill, even if he needed to discard unnecessary mercy, he had no fetish for abusing his opponents or enjoying their wails.
But this time, Luffy's actions had truly enraged and revolted him.
Thus, he didn't mind using a slightly more cruel method to let him taste the bitterness of defeat.
Puchi!
As the second sound of tearing rang out, a second pair of bat-like Devil wings was forcefully ripped from Luffy's back by Leon, causing blood to splatter everywhere in an exaggerated spray.
"Get... away from me!!!"
Luffy was tightly locked down by countless rocks. He could only watch in excruciating pain as his wings were torn apart by Leon one after another, falling deeper into madness.
Boom!
The demonic power of a Ten-Winged class Devil erupted from Luffy's body once more. Like the most brutal force, it violently shattered the countless rocks binding him, turning them into a spray of gravel.
Swish!
Leon flapped his wings and glided away before Luffy's power erupted, avoiding the storm-like aura of demonic energy.
He raised a single hand toward the sky, causing lightning to thunder within the dark clouds once more. Bolts of lightning crashed down directly toward Luffy, one after another in a relentless barrage, causing bursts of thunderous light to explode continuously.
But this time, it was Leon's attacks that were repelled by the storm of energy swirling around Luffy. However, what appeared on Luffy's body was a pure storm of demonic power, a massive aura that shook the very space around them.
"So what if you're a Sacred Gear user? So what if you have the power of the second strongest Longinus in the world?"
Luffy's back was a bloody mess, with only two pairs of Devil wings remaining. His image looked exceptionally miserable, yet also exceptionally frenzied.
"It's merely a creation of God! This power I possess was taken directly from a God!"
The demonic aura on Luffy's body had become pitch-black like ink, much like the mysterious little black snake from earlier.
"With my current strength—I shouldn't lose! I won't lose!"
The skin all over Luffy's body began to crack, and the seeping blood dyed him red, making him look like a man marching toward self-destruction, his physical body on the verge of collapse.
And that was essentially the truth.
"This demonic power—!"
"He's outputting demonic power beyond his limit. He's throwing his life away!"
Rias and Sona were forced to retreat from the edge of that terrifying demonic power, maintaining a distance from Leon and Luffy. As they watched this scene, their expressions shifted uneasily.
Every Devil had a limit to their demonic power output. High-class Devils had their limits, Ultimate-class Devils had theirs, and even Satan-class beings had their own output thresholds. Otherwise, if they released all the demonic power in their bodies at once, the instantaneous destruction caused would be far more terrifying than a nuclear bomb.
Luffy's strength had indeed skyrocketed because he swallowed that mysterious little black snake, and his output had become greater than normal, but it was roughly equivalent to a Ten-Winged Devil—the same level as the power he had obtained, not exceeding it by too much.
Now, however, Luffy was disregarding the safety of his physical body to output power at an overload, causing the demonic power released in a single moment to be even greater than that of a Ten-Winged Devil.
This certainly bought him impressive destructive force, but his body was crumbling and disintegrating because of this overloaded output.
"I don't believe it! I won't lose to a mixed-blood piece of trash!"
Luffy's eyes were blood-red as he converted all his demonic power into massive pillars of light, firing them one after another toward Leon.
Leon looked at the blood-soaked Luffy with indifference. He remained oblivious to his roars, his madness, and his life-threatening outburst. He simply channeled his own Eight-Winged level demonic power steadily into his Sacred Gear, letting the aura of the Sacred Gear replace his own demonic aura, burning around his body.
If Rias's demonic power was a vivid red like her hair, and Sona's was a blue indistinguishable from water, then Leon's demonic power was purple.
The purple demonic aura was very restrained and easily diffused into the surroundings. This was a standard characteristic of the direct Eligos bloodline's demonic power, which could easily serve as a detection tool, making them adept at discovering secrets or unearthing hidden ruins and treasures.
However, when Leon used all his demonic power to activate his Sacred Gear, the aura of the Longinus known as "Zenith Tempest" would replace his demonic aura, appearing in this world with the fluctuations inherent to a Sacred Gear.
And the color of Zenith Tempest's aura was a pure white that could accommodate all attributes.
Boom! Boom! Boom! Boom! Boom! ———
In the high skies of the Master Chamber, the two Devils—one emitting a pure white aura and the other a pitch-black one—faced each other across the void. One continuously unleashed attacks of various attributes, while the other frantically vented demonic power.
Leon pushed his Sacred Gear's power to the limit and utilized it to its fullest, causing fire, lightning, ice, storm, rock, and flood to manifest one after another, attacking Luffy in succession.
Luffy, in turn, simply fired high-yield demonic energy attacks in a frenzy, letting massive pillars and orbs of light shoot out violently. They collided with the incoming fire, lightning, ice, storms, rocks, and floods, exploding against each other, entangling, and neutralizing one another, triggering deafening roars.
In an instant, the sky above the entire Master Chamber was filled with frantic shockwaves and explosions. The resulting aftershocks expanded rapidly, causing the vast room to vibrate frequently, with the magnitude of the tremors growing larger and larger.
Rias and Sona could not get close to that battlefield and could only stay locked in combat with the surviving Devils of the Old Satan Faction.
Though only a few remained and their numbers were greatly reduced compared to the beginning, these survivors were either High-class or Middle-class Devils. Attacking together, they caused considerable trouble for Rias and Sona, leaving them with no attention to spare for anything else.
In the eyes of Leon and Luffy, there was no one left but each other. One coldly activated his Sacred Gear, dominating various attributes, while the other became increasingly manic.
"Die! Die, die! Just hurry up and die for me!"
Luffy felt as if his nerves were starting to burn. Sharp pain radiated throughout his entire body, as if he were soaking in lava, as if he might explode at any moment. It was excruciating.
Before coming here, he could never have imagined that he would be pushed to this point by a new-generation Devil, forced directly into a desperate corner.
Originally, power at the Ultimate-class level should have been enough to easily handle a few new-generation High-class Devils. Furthermore, Luffy had utilized this labyrinth space, pre-arranging numerous rooms and trials to wear down his enemies.
In his view, even if Leon and the others reached him, having been drained by the gauntlet and possessing less strength than him to begin with, they shouldn't have been able to escape his judgment even with some unexpected tricks. Not to mention he had brought the "Snake" bestowed by that Great Person.
Even if there were an accident, as long as he used the power of the "Snake," he should have been able to resolve it easily, using absolute strength to kill these favored ones of the "fake" Satans and give the current Underworld a profound lesson.
But why did things turn out like this?
Why did a mixed-blood Devil, unheard of until recently, possess strength no less than his own at the very moment he reached adulthood? Why was he a genuine Eight-Winged Devil?
And why did this person possess one of the highest-tier Sacred Gears, a power said to be capable of eliminating even Gods and Satans?
To Luffy, all of this felt like a nightmare.
Unfortunately, in Leon's eyes, his despair and pain were exactly what he deserved.
"While it's a bit funny to tell a Devil that 'evil brings its own destruction,' there is no doubt that those words are the most suitable thing for you right now."
Leon finally spoke, his voice calm and indifferent in stark contrast to Luffy's madness.
"Your strength is actually decent. If I had faced you not long ago, I might not have been able to defeat you this easily."
"Therefore, the reason for your failure is laughable—it was simply bad luck."
"Of course, from the moment you set your sights on our group, perhaps this result was destined."
After all, setting aside himself and Sona, Rias's side was a genuine "protagonist squad."
"Take this nauseating madness and resentment with you, and go repent in hell."
Leon's voice was like the scythe of the Grim Reaper, cutting into Luffy's soul.
Boom!
In the next moment, the pure white aura on Leon's body erupted violently, causing earth, water, wind, fire, thunder, and ice to entwine together, transforming into a physical natural disaster that ground forward with overbearing and brutal force.
The massive pillars and orbs of light formed by Luffy's frantic demonic attacks were swallowed, annihilated, and crushed by the natural disaster.
"Ah—!"
Luffy's pupils shrank to the size of pinheads. His mouth hung open, as if he still wanted to say something, but all sound was drowned out by the massive roar.
Before long, Luffy's figure was completely swallowed by the disaster.
The violent demonic power gradually flickered out within the cataclysm until, like its master, it vanished completely———