As the Zynigami Jr. thinned the ranks of the Soul Army, the path to the center of the void finally lay open. Towering over the chaos, the Terrible Demon—the horrific fusion of Lucifer and a thousand ancient nightmares—let out a sound that transcended a roar; it was a frequency of pure extinction. The demon's six eyes locked onto Erif × Daniel, and with a burst of speed that defied its colossal size, it charged. The ground beneath its feet didn't just crack; it vaporized. Lucifer, deep within the beast's psyche, pushed the fusion to its absolute limit, feeding the demon's hunger with his own burning desire for redemption and vengeance.
Erif × Daniel did not move until the demon's shadow fell over him. With a snarl of annoyance, he unleashed a wave of "Reality Erasure" from his crown, a beam of white nothingness designed to delete anything it touched. But the Terrible Demon was not made of ordinary matter; it was a construct of the "Unwritten" void and forbidden hells. It took the hit, its flesh smoking and dissolving into black ash, only to regenerate instantly as it swung a massive, clawed hand. The blow caught Erif's fortress, shattering the soul-stone architecture and sending the God-King plummeting into the grey dust of the battlefield.
The fight intensified into a blur of cosmic violence. Erif rose from the crater, his Second Form radiating a black aura that distorted the air. He summoned "Soul-Blades" the size of skyscrapers, raining them down upon the demon in a relentless barrage. The Terrible Demon countered by exhaling a breath of "Abyssal Fire"—a flame so cold it burned the soul rather than the body. The two forces collided, creating a vortex of energy that began to pull in surrounding debris, stars, and even fragments of the torn Script. It was a battle between the ultimate Tyrant and the ultimate Monster, and reality was the victim of every strike.
Erif, realizing the demon's power was fueled by Lucifer's indomitable will, tried to strike at the pilot's mind. He used the power of his crown to flood the demon's consciousness with the faces of the friends Erif had once loved, trying to weaken Lucifer with guilt. But Lucifer didn't flinch. "I have lived in the fire for eons, Erif!" he roared through the demon's throat. "Your lies have no heat here!" The demon grabbed Erif in a grip that crushed divine armor, its claws sinking into the God-King's chest. They wrestled through the sky, crashing through the overlapping dimensions of the broken multiverse.
The final moment came when the Terrible Demon pinned Erif against the very rift from which the Zynigami had emerged. Using the combined energy of the thousand demons within it, the beast began to glow with a blinding, terrifying violet light. Lucifer channeled every ounce of his demonic essence into a single point—a "Void-Piercer" strike. With a scream that shook the foundation of the Final Story, the Terrible Demon drove its fist through Erif × Daniel's crown, shattering the artifact of the Rings and piercing the King's heart. The crown's energy backfired, a golden explosion that began to consume Erif from the inside out.
Erif × Daniel looked up, his fused eyes finally clearing of the dark fog. For a split second, the old Erif—the teacher, the seeker—seemed to look back at Lucifer. Then, the demonic rot of the curse took hold of his remaining spirit, and he dissolved into a pillar of dark energy that was instantly inhaled by the waiting Zynigami Jr. The King of Souls was gone. The fortress crumbled into dust, and the Soul Army vanished into the wind. The Terrible Demon stood alone in the center of the crater, its breathing heavy and its form beginning to crack, having achieved the impossible: the death of a God-King.