The Greatest Assassin Gets Reincarnated in Tensura

The air around us crackled with raw energy as my lovers and I trained in our secluded domain. Velzard's icy breath froze the air itself, while Testarossa's crimson destruction magic clashed against Ultima's chaotic spells. Carrera, ever the battle-hungry one, grinned as she fired off blasts that could level mountains.

I parried a strike from Velzard, smirking. "You're holding back."

She huffed playfully. "Maybe."

Just as we were about to escalate, one of my spies appeared, kneeling before me. His aura was tense, meaning whatever news he carried was of great importance.

I raised a hand, signaling to my lovers. "That's enough for now."

With a slight sigh, Velzard withdrew her icy presence, while Testarossa, Ultima, and Carrera ceased their attacks, each of them exchanging glances of mild curiosity.

I turned my attention back to the demon spy. "Speak."

The spy didn't hesitate. "Lord Arion, I have returned with the intelligence you requested regarding Leon Cromwell and his involvement in summoning people from other worlds."

I narrowed my eyes slightly, motioning for him to continue.

"Leon Cromwell is indeed summoning people from another world, and he is doing so with the assistance of the Moderate Harlequin Alliance."

I frowned at the mention of those troublesome clowns. They had their hands in too many schemes already.

Testarossa scoffed. "Those freaks again? I should have killed Footman and Tear when I had the chance."

Carrera grinned. "Oh? Should we pay them another visit?"

Ultima, ever eager for violence, chuckled. "Sounds fun."

I held up a hand to silence them as the spy continued.

"His reason for these summonings is… unusual. He is not doing it for power, nor for creating an army."**

Now that caught my attention.

"Then why?" I asked.

The spy took a breath before revealing the answer.

"Leon is searching for someone. His childhood friend—Chloe."

The moment the spy uttered that name, something clicked in my mind.

Chloe.

I had heard that name before, in fragments of time and whispers across dimensions.

I glanced at Velzard, who immediately caught on. "That's… interesting."

Testarossa tilted her head. "You recognize the name?"

I nodded slowly. "If it's the same Chloe I'm thinking of, then Leon's actions just became far more intriguing."

I leaned forward, contemplating the implications. Chloe was no ordinary summoned individual.

In some timelines, she was a warrior beyond compare. In others, she was the key to Rimuru's survival. She was a being who had traveled through time itself, desperately searching for the perfect future.

But did Leon even know what Chloe truly was?

Or was he blindly chasing a ghost of his past, not realizing the ripples of his actions?

Velzard's gaze turned sharp. "So what now, Arion? Do we interfere?"

Ultima smirked. "Or do we let Leon continue his search, unaware of the bigger picture?"

Carrera cracked her knuckles. "If he becomes a problem, I'll blast him."

I exhaled slowly, processing the possibilities.

Leon was acting on a personal obsession. The Harlequin Alliance, likely under Yuuki's manipulations, was assisting him, possibly for their own unknown motives.

And now, with Rimuru growing stronger, and Chloe's fate already intertwined with his in one way or another…

I finally spoke. "For now, we observe. We let Leon continue, but we keep a closer eye on him."

I turned to my spy. "I want more details. Monitor the Harlequin Alliance's movements, and find out exactly how many summons have been conducted."

The spy nodded. "Understood, my Lord."

I then glanced at my lovers. "If Leon oversteps, we will remind him that he is not the only player in this game."

A small smirk played on Velzard's lips. "He won't even see us coming."

Carrera laughed. "Now this is getting fun."

I leaned back, watching as Rimuru's future continued to unfold before my eyes. The game was getting more complex.

And I, Arion, would make sure that I remained several steps ahead.

----____----

I sat in the dimly lit chamber, swirling a glass of deep crimson wine, its surface reflecting the flickering candlelight. My throne-like chair, lined with black velvet, was the perfect contrast to the elaborate chessboard placed before me. Clayman, Frey, and Carrion had decided to play a game… but they didn't realize that I had already arranged the pieces.

I glanced at my lovers—Velzard, Testarossa, Ultima, and Carrera—each of them seated elegantly, their piercing gazes awaiting my plan. Diablo, standing nearby, was already smiling, sensing the delicious schemes that were about to unfold.

Clayman, ever the arrogant fool, thought himself a mastermind, yet he was nothing more than a puppet himself, dancing on strings he couldn't even see. He was convinced that by manipulating Milim, and with the backing of Frey and Carrion, he could finally bring Jura Tempest under his control.

Frey, the calculating harpy queen, was only interested in maintaining her own power. She had aligned with Clayman out of caution, sensing the growing strength of Rimuru's new nation. However, she was a woman of pragmatism, not loyalty. If given the right nudge, she would turn against him the moment it suited her.

Carrion, the Beast King, was a warrior first, ruler second. His kingdom of Eurazania was strong, but he had a reckless streak. He agreed to Clayman's plan not out of trust, but because he saw an opportunity for his own gain. Yet he underestimated just how deep the shadows truly ran.

Milim… well, Milim was different. She wasn't truly part of their game. For her, this was just another fun distraction, a chance to fight, to break things, to enjoy chaos. She was unpredictable. But she was Veldanava's daughter, and as much as I enjoyed manipulating things from the dark, there were some beings too important to move directly.

So, I chose my targets carefully.

Clayman. Frey. Carrion.

I placed a single black chess piece down, letting the sound echo in the silence.

"We will not crush them directly," I said, my voice calm. "That would be too easy. No, we will make them destroy each other."

Velzard leaned forward, intrigued. "How do we begin?"

I smirked. "First, we feed their paranoia."

Phase One: Feeding Suspicion

Diablo was the first to move. He would infiltrate Clayman's information network, spreading 'rumors' through trusted sources. The message? That Frey and Carrion were playing their own game behind Clayman's back.

To Frey's subordinates, Diablo planted whispers that Carrion sought to use their alliance to expand his territory, intending to betray her the moment Tempest fell.

To Carrion's warriors, he whispered that Frey had struck a secret deal with Rimuru, intending to sell Carrion out in exchange for her own safety.

Doubt is the enemy of all alliances.

Phase Two: The Illusion of Treachery

While Diablo was playing with minds, Ultima and Testarossa executed the second part of the plan.

Testarossa led an 'ambush' on a supply convoy supposedly meant for Clayman. But instead of killing the messengers, she let them escape—with just enough damage to look convincing. They ran back to Clayman, swearing they had been attacked by Frey's forces.

Ultima then orchestrated a secret 'meeting' between Frey's generals and a disguised agent posing as Carrion's envoy. This meeting, of course, was leaked directly to Clayman.

Clayman, already paranoid, wouldn't be able to resist jumping to conclusions.

Phase Three: The Breaking Point

Carrera and Velzard played the final, most delicate part.

Carrera, with her love for destruction, unleashed a controlled attack near Eurazania's borders—making it seem like Frey's forces had violated their alliance.

Meanwhile, Velzard delivered a single, anonymous message to Frey.

"Carrion knows your secret. He plans to eliminate you first."

Frey was too smart to take such a message at face value, but with all the other incidents stacking up, doubt would gnaw at her mind.

And when Frey and Carrion began questioning each other's loyalty, Clayman—being the fool that he was—would see his chance to strike first.

Phase Four: The Final Blow

With paranoia at its peak, I sent Diablo for the final act. He infiltrated Clayman's castle and left behind false documents, 'proving' that Frey had been working with Rimuru all along.

Then, at the perfect moment, I had Ultima intercept a message from Clayman to his forces, twisting its contents before sending it to Carrion.

The message?

"Frey has been compromised. She is now working with Rimuru. The plan must change. She will be eliminated."

Carrion would not wait to be betrayed.

And Frey, seeing the sudden shift in Carrion's forces, would strike first to defend herself.

Days later, as my lovers and I watched from the shadows, the plan unfolded beautifully.

Carrion confronted Frey, accusing her of turning against their alliance. Frey, already suspicious of Carrion's growing power, refused to back down.

And then, Clayman made his move—believing he was the mastermind.

He ordered his forces to attack Carrion, thinking Frey would support him.

But Frey, now believing Clayman had set this up all along, turned against him instead.

The alliance shattered.

Carrion and Frey became enemies, each blaming the other for the betrayal.

Clayman, now isolated, was left scrambling for a way to regain control.

I sat back, exhaling in satisfaction as I watched them tear each other apart.

Velzard chuckled. "That was almost too easy."

Ultima grinned. "Watching them squirm was the best part."

Testarossa smirked. "Should we step in and finish them off?"

I shook my head. "Not yet. Let them bleed first."

Carrera laughed. "Clayman's panicking. He has no idea what's happening."

Diablo, standing behind me, bowed slightly. "A flawless execution, my Lord. I must say, you are truly a master of shadows."

I smirked, my eyes gleaming.

Clayman wanted to play the game.

I simply made sure he lost.