The Greatest Assassin Gets Reincarnated in Tensura

The moment Chloe vanished in a flash of light, she expected to arrive in the Jura Forest, where she would seek out Veldora.

But the moment she reappeared, she knew something was wrong.

The air was thicker, heavier, ancient. Instead of the lush, green trees of Jura, she found herself standing in a vast, mystical realm that stretched beyond her understanding. The sky was a swirling mass of golden and violet hues, with celestial bodies moving in unnatural ways. Floating black monoliths hovered in the air, inscribed with glowing runes, humming with an otherworldly energy.

She had never seen a place like this.

Her heart pounded.

"Where… am I?" she murmured, her eyes scanning her surroundings. "I was supposed to be in Jura. I know I didn't miscalculate the coordinates."

Then, a voice rang out, deep and commanding.

"Indeed, you didn't. But I had… other plans."

Chloe whipped around, instinctively gripping the hilt of her sword. From the shadows of this surreal world, a figure emerged.

A man, tall and imposing, draped in an elegant black cloak, stepped forward. His face was completely hidden beneath the shadow of his hood, but his presence alone sent a chill through Chloe's spine.

She couldn't see his face, but she could feel his power.

This was no ordinary being.

Her instincts screamed danger.

Without hesitation, she unsheathed her sword, its radiant blade gleaming as she took a defensive stance. "Who are you? Where am I? What do you want?"

Arion walked forward, unbothered.

And then, with the simplest touch of his fingers, he pressed against the edge of her blade.

Her sword vanished.

It didn't shatter. It didn't fall. It didn't disintegrate.

It simply ceased to exist.

Chloe's eyes widened in shock.

"What?!" she gasped, instinctively jumping back, her entire body on high alert. This was impossible. Not even the strongest magic she had encountered could simply erase a weapon from existence.

This man… was beyond anything she had ever faced.

"Relax." Arion's voice was calm, almost amused. "I didn't bring you here to harm you. If I had wanted you dead, you wouldn't have even realized it before it happened."

Chloe gritted her teeth. He was right. If he could do this with just a touch, then she wouldn't stand a chance in a fight.

She took a deep breath, forcing herself to stay composed.

"…Then why am I here?" she asked cautiously.

Arion gestured with a flick of his wrist.

In an instant, the ground beneath them shifted, transformed. A magnificent golden table materialized in the void, surrounded by floating chairs. Above them, the sky warped, forming a shimmering dome of cascading lights, as if reality itself bent to Arion's will.

With another flick of his hand, an assortment of drinks and delicacies appeared—foods Chloe had never seen before, their aroma rich and enticing.

Arion sat down gracefully, motioning to the chair opposite him. "Sit. Have a drink. Let's talk."

Chloe hesitated.

She didn't trust him, but… he hadn't done anything hostile. And in truth, she had no choice.

Cautiously, she sat.

Arion poured a shimmering golden liquid into an ornate glass and placed it in front of her. "Try it. You might like it."

Chloe took the glass, sniffed it cautiously, then took a sip.

Her eyes widened.

The taste was indescribable. It was unlike anything she had ever had—a perfect blend of sweet, savory, and refreshing, a drink that carried the essence of stars and time itself.

Arion smirked, sensing her amazement. "Enjoy it."

Chloe set the glass down and stared at him. "Enough games. What do you want from me?"

Arion leaned forward, his fingers intertwined.

"Tell me about the future. The one you came from."

Chloe's breath hitched.

"How do you know about that?"

Arion chuckled. "Come now, girl. You think I wouldn't know? My reach extends further than you realize. I knew the moment you arrived in Luminous's territory. And I knew what you told her."

Chloe's mind raced. Who was this man?

She exhaled slowly, her grip on the table tightening. At this point, there was no point in hiding it.

"…Alright." She locked eyes with him. "I came from the future."

Arion nodded, unfazed. "And in that future, what happens?"

Chloe hesitated. Then, she spoke.

"The world will change. A slime named Rimuru will be reincarnated, and he will become one of the most powerful beings in existence. He will bring balance, reshape the world, and bring peace where there was once endless war."

For the first time, Arion was silent.

Chloe watched him carefully, but his expression remained unreadable beneath his hood.

Then, he laughed softly.

"A slime, you say? How amusing."

Chloe narrowed her eyes. "You don't seem surprised."

Arion's smirk deepened. "I already knew about Rimuru."

Chloe's breath caught in her throat.

She stared at him, eyes wide with shock. "What? How?"

Arion leaned back, his arms crossed. "Veldanava told me."

Chloe's heart pounded. Veldanava? The Creator himself had known about Rimuru? Did that mean… Rimuru's existence was predestined? Or was it something more?

Her mind raced with questions, but before she could ask, Arion simply tilted his head and spoke again.

"Continue."

His voice was calm but commanding. It wasn't a request—it was a command, wrapped in an unshakable presence of authority.

Chloe hesitated for only a second before nodding.

She took a deep breath. "Very well. I will tell you what happens next."

"At first, Tempest was just a small nation, a place where monsters and humans could live together in peace. Rimuru built it with kindness, accepting all who sought shelter. He believed in a future where humans and monsters could coexist…"

Chloe's expression darkened.

"But not everyone shared his vision."

Arion listened in silence as she continued.

"The Kingdom of Falmouth saw Tempest as a threat. They feared Rimuru's growing power, the unity he brought between species. So, they launched an attack…"

Her fists tightened.

"They slaughtered Tempest's people. Burned villages. Killed innocent lives."

Arion remained still, but the air around them subtly shifted, as if reality itself reacted to Chloe's words.

She looked down at the table, her voice quieter.

"And then… they killed Rimuru's friends. His people. His family."

She exhaled sharply. "That was the moment everything changed."

Her eyes met Arion's.

"Rimuru, in his grief, made a choice. He performed a massive summoning and slaughtered 20,000 soldiers from Falmouth. Their deaths fueled an evolution unlike anything seen before. He ascended… and became a True Demon Lord."

Arion's fingers drummed against the table.

"A single slime, ascending to Demon Lord status. Interesting."

Chloe nodded. "After that, he revived his fallen people, reshaped Tempest, and became even stronger. The world took notice. But that was only the beginning."

She inhaled deeply.

"Not long after, the Eastern Empire launched an all-out war against Tempest. They had one of the strongest armies the world had ever seen. Their emperor, Rudra, had ruled for thousands of years, pushing humanity toward conquest."

Arion's head tilted slightly. "And?"

Chloe's gaze sharpened.

"Rudra… was never truly in control."

For the first time, Arion's posture shifted slightly, an almost imperceptible change in his demeanor.

Chloe continued, voice unwavering.

"He was a puppet. Controlled by his own Ultimate Skill—Michael."

Arion's fingers stopped drumming. "Michael…" he murmured, as if testing the name.

Chloe nodded. "Michael was an ability that had taken over Rudra's mind. He thought he was ruling, but in truth, his actions were guided by something beyond his control. The Empire waged war under Michael's influence, with plans to conquer the world."

"But in the end, Rudra died."

Arion was silent for a long moment. Then, he finally spoke.

"And after his death? What became of Michael?"

Chloe's expression darkened.

"That's when things got worse."

"After Rudra's fall, Feldway revealed himself."

Arion let out a quiet chuckle. "Ah… Feldway. That fool."

Chloe narrowed her eyes. "You know him?"

Arion smirked. "I know of him."

"Continue."

Chloe nodded, pressing on.

"Feldway was the true mastermind behind everything. He led an army of Angels and sought to resurrect Veldanava."

She took a breath, bracing herself.

"And they planned to control all the True Dragons as well."

Arion finally leaned forward, his presence intensifying.

Chloe could feel the air twist, warp. It was as if the very fabric of this realm responded to his emotions.

But his voice remained calm.

"And how did Rimuru and the Demon Lords respond?"

Chloe clenched her fists.

"They fought."

She looked at Arion, her voice filled with conviction.

"Rimuru and the Demon Lords stood together against Feldway and the Angels. The battle was unlike anything the world had ever seen. Gods and monsters clashed. True Dragons raged. It was war on a scale beyond imagination."

She hesitated.

Then, her next words came, slow and deliberate.

"And in the end… Rimuru was killed."

The moment those words left her lips, the entire world trembled.

Or rather—this space trembled.

It was subtle, like a ripple across a vast ocean. But Chloe felt it.

Arion's aura shifted. The sky dimmed. The very air crackled.

Chloe watched him carefully, waiting for his reaction.

Finally, after a long silence, Arion let out a slow, deep breath.

Then, in a voice calm but absolute, he spoke:

"That… is unacceptable."

Chloe's heart skipped a beat.

Arion leaned back, his hooded face unreadable.

"I see now why you are here."

Chloe narrowed her eyes. "What do you mean?"

Arion simply smiled.

"The future you saw is but one possibility. And now that I know of it… perhaps it's time I decide whether it comes to pass."

Chloe's blood ran cold.

She didn't know if that was a good thing… or something far, far worse.