Eren, Jin, and Aria pressed deeper into the heart of the crystal labyrinth, their recent victory bolstering their spirits but not dulling their caution. The twisting corridors seemed to pulse with an otherworldly energy, growing more intense with each step forward.

"We must be getting close," Aria whispered, her eyes darting from shadow to shadow. "The mana concentration here is off the charts."

Jin nodded, his muscles coiled and ready for action. "Stay sharp. I doubt our last encounter was the toughest we'll face."

As if in answer to Jin's words, the narrow passage suddenly opened into a vast circular chamber. The ceiling arched high above them, shimmering with constellations of embedded crystals. At the center stood a raised dais, upon which rested a pulsing orb of pure, crystallized mana.

"The Nexus Core," Eren breathed, his eyes fixed on the prize they'd fought so hard to reach.

But they weren't alone.

From three other entrances, teams emerged almost simultaneously. Eren's group tensed, recognizing the caliber of their new opponents at a glance.

The first team was led by a young woman whose very presence seemed to distort the air around her. Heat shimmered in her wake, and her eyes glowed with an inner fire. Flanking her were two men, one wielding a massive war hammer, the other with hands wreathed in crackling electricity.

"Lira of the Blaze Realms," the woman introduced herself, her voice carrying the roar of a forge. "Descendant of Vulcan himself. And these are my companions, Bjorn and Raijin."

Bjorn, the one with the war hammer, stepped forward. His presence crackled with barely contained power, and his eyes held the storm-grey of thunderclouds. "I am Bjorn Thorson, descendant of the mighty Thor himself. Our victory here is preordained by the gods."

From another entrance strode three figures clad in flowing robes adorned with mystical sigils. Their leader, a man with piercing eyes and a dragon tattoo coiling up his neck, stepped forward.

"I am Fenghuang of the Azure Dragon Sect," he announced, his voice carrying the weight of ancient tradition. "We claim the Nexus Core in the name of Murim."

The final team to enter was a trio of individuals who seemed to blur at the edges, as if they weren't fully anchored to this reality. Their leader, a woman with silver hair and eyes that reflected entire galaxies, spoke with a voice that echoed strangely.

"Greetings, fellow contenders. I am Nova, representative of New Terra and the Adventurers' Guild. My companions are Quasar and Nebula. We've come too far to leave empty-handed."

For a moment, the chamber was filled with tense silence as the four teams assessed one another. Then, as if by some unspoken signal, chaos erupted.

Lira unleashed a torrent of flame that forced everyone to scatter. Fenghuang countered with a sweeping gesture that sent blades of wind slicing through the air. Nova and her team moved with uncanny speed, striking with precision.

Eren's sword blazed with alternating shadow and light as he parried blows from multiple directions. Jin moved like a blur, his fists connecting with devastating force against anyone who came too close. Aria's spells created shields and launched counterattacks in rapid succession.

The chamber became a swirling maelstrom of elemental forces and esoteric techniques. Lira's team brought the raw power of primordial elements to bear, with Bjorn calling down lightning that resembled his legendary ancestor's. Fenghuang and his sect-mates demonstrated the refined techniques of Murim cultivation. Nova's group utilized advanced combat techniques, moving with incredible agility and striking with enhanced strength.

As the battle reached its crescendo, Eren and Jin exchanged a quick glance. It was time to unleash their full potential.

Eren's eyes blazed with determination as he channeled his mana into his most powerful techniques. "Mana Armor: Advanced!" he shouted, and instantly, a shimmering field of energy enveloped him, hardening into an iridescent second skin. The very air seemed to ripple around him as attacks from their opponents dissipated harmlessly against the impenetrable defense.

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With a swift motion, Eren raised his sword high. "Valestrian Technique: Lunar Eclipse Slash!" The blade became wreathed in writhing shadows that seemed to devour the light around it. As he brought the sword down, a crescent of pure darkness erupted forth, carving a path through the chamber and sending Lira and Bjorn diving for cover.

Not to be outdone, Jin's body began to glow with an intense inner light. "Murim Art: Heavenly Force Palm!" His hand shot forward, trailing streams of qi The air itself seemed to compress before his palm, creating a shockwave that sent Fenghuang and his teammates stumbling backward.

Aria, her eyes glowing with arcane power, began weaving a complex spell. "Elemental Convergence: Primal Fury!" she intoned. The air around her crackled with energy as swirling vortexes of fire, ice, lightning, and earth materialized, orbiting her like miniature planets before launching towards their foes.

The synergy between Eren, Jin, and Aria was breathtaking to behold. Each move flowed seamlessly into the next, their attacks and defenses perfectly complementing one another. Where Eren's shadows struck, Jin's Murim techniques followed. When Jin drove an opponent back, Aria's spells were there to ensnare them.

Lira attempted to counter with another blast of flame, but Eren was ready. "Valestrian Sword Art: Frost Lotus Blooming!" His blade traced an intricate pattern in the air, leaving behind a trail of icy mana that coalesced into a giant, crystalline lotus. The flower unfurled its petals, releasing a wave of freezing energy that instantly extinguished Lira's fire and encased her feet in ice.

Bjorn, enraged by seeing his teammate immobilized, charged forward with his war hammer crackling with lightning. But Jin was there in an instant, his Murim mastery allowing him to redirect the god-descendant's momentum. "Murim Secret Technique: Flowing Stream Redirection!" In a move that seemed to defy physics, Jin sent Bjorn crashing into Fenghuang, leaving both warriors stunned.

Nova and her team, realizing the tide had turned decisively against them, attempted a strategic retreat. But Aria's voice rang out, "Arcane Binding: Ethereal Chains!" and suddenly, the New Terran team found themselves ensnared by glowing magical chains, their movements restricted.

With their opponents reeling, Eren, Jin, and Aria pressed their advantage. Their movements were perfectly synchronized, each attack flowing into the next with fluid grace. It was as if they were performing an intricate dance rather than engaging in combat.

Eren's blade wove a tapestry of light and shadow, each strike precise and devastating. "Twilight Technique: Twilight Requiem!" he called out, his sword becoming a blur of radiant light and consuming darkness. The air around the blade shimmered and warped as it struck, each hit resonating with the power of dusk and dawn.

Author's Note: That is one of Azar's Trademark Techniques!(Just for your info)

Jin's movements flowed like water, his unique Murim techniques leaving their opponents gasping for breath. "Murim Art: Thousand Whispers of the Wind!" he called out, his body seeming to multiply as he struck from multiple angles simultaneously.

Aria, her hands tracing complex sigils in the air, unleashed her most powerful spell yet. "Cosmic Invocation: Astral Bombardment!" The ceiling of the chamber seemed to glow with an otherworldly light. Beams of pure magical energy rained down, each impact sending shockwaves of arcane force rippling through the battlefield.

In a matter of moments, the outcome became clear. Lira's team, for all their elemental might, found themselves outmatched by Eren's masterful swordsmanship and control over light and shadow. Fenghuang and his sect-mates, despite their refined Azure Dragon techniques, could not keep pace with Jin's mastery of his unique Murim arts. Even Nova's advanced combat skills proved inadequate against the perfect synergy of Eren's team and the sheer magical might of Aria's spells.

As the dust settled, Eren, Jin, and Aria stood tall, their opponents sprawled around them in various states of defeat. The chamber fell silent, save for the heavy breathing of the combatants.

Lira, her fire completely extinguished, was the first to speak. "I... I've never seen anything like that. Your power,... it's unreal."

Bjorn, his godly heritage humbled, nodded in agreement. "Even Thor himself would be impressed by such a display. You have truly earned your victory."

Fenghuang, despite his injuries, managed to bow deeply. "Those techniques... I've never seen their like before. The Valestrian sword arts, those unique Murim techniques, and magic that rivals the heavens themselves... The Azure Dragon Sect acknowledges your supremacy."

Nova, her form battered but still standing, shook her head in amazement. "Inmy adventures, I've never witnessed such perfect synchronization between teammates. The Adventurers' Guild will be fine with our performance if we state we went against you guys."

Eren nodded to each of them in turn, acknowledging their words. Then, with Jin and Aria at his side, he ascended the dais. As his hand closed around the Nexus Core, he felt a surge of power unlike anything he'd experienced before.

The labyrinth trembled, and a voice that seemed to come from everywhere and nowhere spoke:

"Champions have been chosen. The trial is complete."

In a flash of blinding light, Eren found himself and his team transported back to the entrance of the labyrinth. The other teams appeared moments later, looking dazed but unharmed.

As the reality of their victory sank in, Eren exchanged tired but triumphant smiles with Jin and Aria. They had faced the best of the best from across the realms and emerged victorious. But even as they celebrated, Eren knew that this was just the beginning.

The real challenge – The True Test– lay ahead.