The Greatest Assassin Gets Reincarnated in Tensura

The first year in Hell passed in a blur of grueling training, endless experimentation, and small victories. Every moment, every breath, was a step closer to mastering his newly acquired powers. The MC had learned to control his skills with precision, turning raw, untamed force into a weapon of calculation and purpose. The training was slow at first, but as days turned into months, the progress became more apparent. The barren, desolate landscape of Hell—blackened, jagged rocks stretching endlessly beneath a crimson sky—served as his crucible.

The beginning had been the most difficult, especially trying to understand the full scope of his abilities. Abyssal Devourer and *Sovereign of Shadows were especially challenging, requiring patience and control.

Lara had first instructed him to practice Abyssal Devourer* with inanimate objects. He focused on absorbing energy from the very rocks beneath his feet, draining them without turning them to dust. He'd felt the weight of it at first—the pull, the hunger—but he learned to regulate it. Slowly, the energy he absorbed didn't feel like a hunger but more like an extension of himself. The more he drained, the stronger he became. Each time, he felt his power grow—each time, his will strengthened.

One night, he practiced on an old, rusted piece of metal that was scattered around the barren plains of Hell. He reached out with his power, and the metal groaned as it began to disintegrate into nothingness, feeding him. He paused, immediately recognizing his error. The metal should not have completely dissolved. He retracted his power, the energy he'd taken pulling away reluctantly, but obediently, as his will controlled it.

"Careful, Master," Lara's voice echoed, her tone both encouraging and cautionary. "You can only absorb so much before you risk exhausting the energy of the surroundings. Always stop before you reach your limit."*

"Got it," he said, wiping the sweat from his brow. It was a constant battle to stay within control, to learn when to stop. But with time, the power he wielded became as natural to him as breathing.

His next task had been to focus on Sovereign of Shadows, manipulating the shadows around him into forms that were both practical and controlled. At first, the shadows were unruly, like a wild, untamed beast. But soon, he was able to create sharp tendrils of dark energy, capable of cutting through the air. He used these tendrils to practice attacks, then learned to change their form into defensive barriers. One day, as he summoned his shadowy tendrils, a demon—a low-ranking creature, barely stronger than the monsters of Earth—attacked him.

The demon was a twisted, hunched creature, with horns curving down its back and eyes that glowed a dull red. It charged at him, swinging a jagged sword, its grotesque form slithering toward him. Without thinking, the MC formed a wall of shadows, his tendrils lashing out and wrapping around the demon's limbs. He pulled, yanking the demon into the air, watching as it struggled against the dark bindings. Then, with a flick of his wrist, the shadows constricted, crushing the demon's form until it lay still.

"Well, that was easy," he muttered to himself, observing the remnants of the demon. It was barely a challenge. But as the years went on, the demons grew more frequent and slightly stronger, a necessary part of his training. Every fight brought new lessons.

"That was a Lesser Demon, Master," Lara's voice came again, as calm as ever. "While their power is insignificant compared to yours, they can still serve as useful practice. Take advantage of these encounters to test your skills in real combat. Only then will you learn the true extent of your abilities."

By the end of the first year, the MC had grown accustomed to his powers. He could manipulate his Dark Telekinesis with ease, lifting and tossing objects of various sizes without a second thought. At first, he'd been limited to lifting pebbles and small boulders, but now he could move entire rocks, reshape the land beneath his feet, and even hurl massive boulders with devastating force.

His Demon Resilience had seen the greatest improvement. He'd subjected himself to controlled torture in a sense—enduring the harshest of conditions Hell had to offer. He'd walked through flames that could burn flesh from bone, and yet, his skin had hardly singed. The pain was still present, but it was manageable, and his body had grown used to such extremes. In fact, he felt the resilience deepen, and the constant challenges made him stronger. There were times when even the environment seemed to want to break him, but his Demon Resilience made sure he never broke.

The Dark Aura Manipulation was another skill he spent significant time perfecting. Initially, his aura had been difficult to control, spilling out of him like an uncontrollable force. Now, he could control it as he pleased, shaping it into powerful barriers or explosive bursts of dark energy. He practiced releasing it in waves, watching as the air around him shimmered with dark energy that made the very ground tremble. It felt intoxicating, but he learned restraint was key. If he allowed it to overflow, it would overwhelm everything in its path, so he kept it in check.

As his skills grew stronger, the Lesser Demons continued to come for him. These demons—wretched, weak creatures—were no challenge now. Some were powerful enough to be slightly annoying, but none could keep up with him for long. However, these attacks were valuable in their own right. Each encounter tested a different aspect of his power, forcing him to grow.

One day, a particularly aggressive Lesser Demon—a towering beast with massive claws—rushed at him. It howled, shaking the very ground as it swung its claws toward his face. The MC smiled, his eyes glowing as he tapped into his newfound power.

Without moving, he extended his Magicule Shield, a protective barrier of invisible energy surrounding him. The claws slammed into it, sending a jolt of magicule-based force into the air, but it did nothing to him. He felt a ripple as the shield absorbed the impact, but there was no break, no crack. His Magicule Absorption kicked in, siphoning the remaining magicules from the attack into himself.

"Nice try," he muttered, his hands raised. He focused, his *Dark Telekinesis* lashing out and sending the demon flying backward, its claws digging into the ground as it skidded to a stop.

In these moments, he felt invincible, but he knew this wasn't the final test. There was always more to learn, more to master.

During this time, Lara also reminded him of something crucial.

"Master," she said one night as he meditated under the crimson sky, "you are still nameless."

He opened his eyes, glancing into the darkness that stretched before him. "Nameless? What does that mean?"

"In this world, names carry great power. Those who are given names by powerful beings can evolve beyond their natural limits. The name serves as a catalyst, unlocking latent potential and increasing power. However, the one who names you must be someone of significant strength, as there is a risk to them in doing so. If they are not powerful enough, granting you a name could result in their death."

The MC absorbed this information, understanding its gravity. "So, I need to find someone powerful enough to name me… or else they risk dying?"

"Correct. There are primordial beings, much like yourself, scattered across the world. Some reside in the deepest pits of Hell, while others remain in the farthest reaches of the universe. You must find one of them. They will be able to name you and allow you to evolve further."

The MC frowned. Primordials? Who were these beings, and where were they located? "Can you tell me more about them?"

Lara's voice turned even more serious. "There are a few that stand out. One is Rouge, located in the deepest chasm of Hell, currently the strongest. Another, Noir. Who is as strong as rouge, there are also Blanc, Jaune, Bleu, Vert and Violet, all scattered across the world in their own territories. But you should avoid them for now."

The MC pondered for a long moment. He knew what he had to do. He was getting stronger by the day, but without a name, he couldn't reach his true potential. He would have to find someone strong enough—and survive long enough to receive a name from them.

But for now, he would continue his training, refining every aspect of his power. The day would come when he would need to confront these beings. And when it did, he would be ready.