When a God of Destruction Was Reincarnated in Tensura:

Deep in the abyss of an uncharted dimension, the seal that had bound Artemis, the Sovereign of Ruin, for eons finally shattered. A blinding, chaotic light erupted, casting jagged shadows across the desolate void as Artemis stepped forward. His alabaster skin shimmered faintly, his crimson eyes glowing with malevolent amusement. A resonant, maniacal laugh echoed through the dimension, reverberating like a symphony of destruction.

Artemis spread his arms wide, feeling the overwhelming surge of his fully restored power. The cursed weapon, Erebus, shifted fluidly between a blade, a scythe, and a spear in his grasp, responding to his chaotic will. He turned his gaze toward the distant cardinal world, his lips curling into a wicked smile. "Oh, how you've grown complacent in my absence," he murmured. "Y'all just wait. My return will be a tempest you cannot withstand. But first… the prelude."

He extended his hand, and the void around him began to warp and twist. From the remnants of his chaotic energy and the magicules lingering in the dimension, Artemis began shaping his minions—his harbingers of ruin. Each was crafted to embody a fragment of his will, a masterpiece of destruction.

Artemis's Minions

The Abyss Reavers

Appearance: Towering humanoid creatures clad in armor that seemed to be forged from the void itself. Their eyes burned with crimson fire, and their bodies were covered in jagged, pulsating runes that radiated chaos.

Abilities:

Entropic Slash: Their weapons, extensions of their bodies, emit chaotic energy that corrodes everything it touches.

Warp Step: They can phase in and out of dimensions, making them unpredictable in battle.

Void Shield: A barrier that absorbs attacks and converts the energy into explosive counterstrikes.

Role: Shock troops designed for frontline destruction and chaos.

The Umbral Stalkers

Appearance: Shadowy, wolf-like creatures with multiple glowing red eyes and elongated claws that drip with corrosive energy. Their forms flicker like living shadows, never fully solid.

Abilities:

Silent Hunt: They become completely undetectable, even to the most advanced perception skills.

Chaos Rend: Their claws tear through barriers and armor with ease, leaving behind destabilizing energy.

Pack Instinct: They coordinate their attacks with uncanny precision, overwhelming their prey.

Role: Assassins and ambushers, perfect for disrupting enemy ranks.

The Ruinborn Colossi

Appearance: Massive, hulking beings made of crystallized chaos energy, their forms glowing with a sinister light. Each step they take causes the ground to fracture and reality to tremble.

Abilities:

Seismic Ruin: They slam the ground, releasing waves of destructive energy that can topple fortresses.

Entropic Absorption: They absorb attacks directed at them and convert them into raw power.

Unyielding Presence: Their sheer size and aura instill fear, paralyzing weaker foes.

Role: Siege engines meant to break through enemy defenses.

The Harbingers of Oblivion

Appearance: Humanoid figures cloaked in tattered robes that seem to devour light. Their faces are hidden, and their hands radiate an eerie, violet glow.

Abilities:

Reality Shatter: They channel Artemis's chaos magic to fracture space and time, destabilizing their surroundings.

Mind Break: Their presence alone can disrupt the mental stability of weaker beings, causing hallucinations and fear.

Chrono Warp: They manipulate the flow of time, speeding up or slowing down the battlefield.

Role: Support units that manipulate the battlefield to ensure victory.

The Dread Sovereigns

Appearance: Elite generals of Artemis's army, humanoid in form but exuding an aura that rivals Demon Lords. Each wields a weapon forged from Erebus's shards.

Abilities:

Dominion of Chaos: They can summon and control lesser minions with ease.

Cataclysmic Strike: A devastating attack that combines chaos energy and their mastery of combat.

Resilience of Ruin: Even when defeated, they can reconstitute themselves unless utterly annihilated.

Role: Commanders and enforcers, leading the charge and maintaining order within the chaos.

Artemis observed his newly created army with a cold, calculating gaze. With a wave of his hand, he summoned a vast fortress made of shifting black crystal—a base of operations for his campaign. The fortress pulsed with chaotic energy, a beacon of despair in the dimension.

He began assigning roles to his minions, testing their abilities and honing their combat strategies. The Abyss Reavers sparred with the Ruinborn Colossi, their clashes shaking the dimension. The Umbral Stalkers darted between shadows, perfecting their ambush techniques. The Harbingers of Oblivion practiced weaving complex spells, creating maelstroms of destruction. Meanwhile, the Dread Sovereigns stood silently, watching over the preparations, their loyalty to Artemis absolute.

Artemis smirked as he surveyed his forces. "Soon, they will tremble before the might of my creations. But not yet. Let them enjoy their fleeting peace while it lasts. When I send my minions, their world will burn."

With another wave of his hand, portals began to open, leading to various corners of the cardinal world. Artemis's laughter filled the void once more as he whispered, "Let the games begin."

As Artemis's seal finally shattered, a cataclysmic surge of chaotic energy erupted, piercing through the dimensions and spreading across the cardinal world. The skies darkened unnaturally, clouds swirling in a tumultuous vortex. The ground trembled as an ominous crimson hue spread across the horizon, and a chilling wind howled through every kingdom, city, and wilderness. This was not just an energy surge—it was a harbinger of destruction.

All across the cardinal world, the strongest sensed it immediately. The Demon Lords, the nations' leaders, and even ordinary mortals felt the weight of Artemis's awakening. The air itself seemed to grow heavier, as though the very fabric of reality was straining under the chaos.

In Tempest, Rimuru stood at the heart of his kingdom, sensing the chaotic ripple. His golden eyes narrowed, and his expression grew resolute. He immediately activated his telepathic network, communicating with his generals and allies.

"All forces, prepare for the inevitable. It's time."

Benimaru, standing by Rimuru's side, clenched his fist, his flames flickering ominously. "It's unlike anything I've felt before. This… this is beyond terrifying."

Diablo, ever calm, smirked. "How thrilling. Let us see how this Artemis fares against Lord Rimuru's forces."

Souei and Zegion were already coordinating the deployment of Tempest's elite troops, while Shion cracked her knuckles with a grin. "Finally, some real action! Let's crush anything that comes our way!"

Veldora, hovering nearby with his arms crossed, chuckled. "This chaotic energy isn't bad! But it pales in comparison to me, the mighty Veldora!"

Rimuru sighed, shaking his head. "Focus, Veldora. This isn't the time for your bravado. We'll need everyone working together."

Dwargon, Sarion, and Other Nations

In Dwargon, King Gazel summoned his mightiest warriors. "We stand united with Tempest. Ready yourselves for a battle that will be etched into history."

In Sarion, Elmesia coordinated with Rimuru, sending their elven magicians to fortify defenses.

Blumund, Falmuth, and other nations gathered their troops, preparing to send reinforcements. Even smaller nations sent whatever forces they could muster, understanding that survival depended on unity.

The Demon Lords had also sensed Artemis's full awakening.

Guy Crimson stood atop his icy fortress, his crimson hair glowing faintly as he smirked. "So, it begins. I hope Artemis is as fun as they say."

Milim Nava, bursting with excitement, clenched her fists. "I'm ready! Let's see what this Artemis is made of!"

Luminous Valentine gathered her vampire knights, her pale complexion betraying no emotion. "This chaotic energy is vile… but it doesn't matter. We'll crush it."

Leon Cromwell, ever stoic, prepared his knights. "There's no room for error. Every move must be calculated."

Ramiris, now in her full glory, flitted about, coordinating with her spirit troops. "This is going to be big… but we'll win! I know we will!"

Draguel's eyes glinted with determination as he prepared his devastating physical might for the coming storm.

As Rimuru's communication network relayed instructions, the allied forces began moving into position:

Tempest's Army: The frontlines consisted of Tempest's strongest generals, with Benimaru leading the charge, Diablo controlling the vanguard, and Zegion guarding critical points. Souei's shadow network monitored for any surprise attacks.

Dwarven Forces: Equipped with indestructible armor and weapons forged in Dwargon's legendary forges, the dwarves stood as a bulwark.

Elven Magicians: Sarion's elite elven magicians created powerful barriers and enchanted weapons.

Demon Lords: Each Demon Lord took command of a separate sector, ensuring every part of the cardinal world was covered.

The labyrinth served as the main fallback point, its defenses bolstered by barriers designed by Rimuru and Ramiris. With its near-infinite levels and regenerative monsters, it was the ultimate stronghold.

Meanwhile, in the void of his fortress, Artemis observed the cardinal world through chaotic rifts. His laughter echoed ominously as he addressed his newly-assembled minions.

"My harbingers of ruin, the time has come. Spread chaos and despair across their lands. Crush their hope before they even see my face."

The Abyss Reavers, Umbral Stalkers, Ruinborn Colossi, Harbingers of Oblivion, and Dread Sovereigns stood ready, their forms pulsating with malevolent energy.

Artemis raised Erebus high, the weapon radiating chaotic light. "Go forth, my children. Bring them to their knees. And when their world is in ashes, I shall descend upon them and show them what true ruin looks like."

With that, his minions poured through rifts into the cardinal world, their presence triggering the start of a war unlike any other. The battle for survival had officially begun.