Eternal Mangekyō Sharingan!

"At that moment, boss disregarded the pain caused by the machete cutting into his body. His expression turned grim.

"You forced my hand!" he shouted as massive magic power surged from his body. He no longer suppressed the injuries he had sustained; he was determined to defeat the two individuals in front of him. Failing to do so would mean succumbing to his injuries.

"Avada Kedavra!" A brilliant green light shot towards Braun, resembling a venomous snake.

In the meantime, Boss seemed to hear the agonizing cry of the person facing death. However, he found the person's behavior rather strange. The person's face remained pale, devoid of panic. Instead, there was an unusual calmness. It was as if the person was dazed.

It was then that Boss realized something was amiss. The dazzling green light pierced through the opponent's forehead without harming them. Braun's motionless body shattered like a mirror as if it had never existed.

"It's an illusion!" The thought struck Boss, and a strong sense of crisis overwhelmed him.

Before he could react, intense pain surged through both his eyes. The familiar toxin invaded his body once again.

"What!" A piercing scream echoed throughout the cave, startling many animals outside foraging for food, making them retreat into the bushes, trembling.

Boss, now blind, flailed his arms wildly, attempting to cast spells. Braun remained silent. Utilizing his Mangekyo Sharingan, he not only controlled Boss but also distorted his sense of direction, causing his spells to miss. Most importantly, he used Sharingan to create an illusion, and he had already stealthily moved to Boss's side. He drove a dagger, coated with eight-eyed arachnid venom, into Boss's eyes.

Braun didn't fare well either. Boss's wild flailing had taken a toll on him, dealing him a severe blow. He felt like his body was on the verge of breaking.

After a long struggle, Boss's massive body finally collapsed. His breath vanished, and his face swelled from the toxins, resembling a water balloon.

Braun knew Boss was now dead. Acromantula venom swiftly coagulates the blood and dissolves flesh and blood into a liquid state, making it easier for spiders to consume their prey.

"Cassatt! Be on guard," Braun ordered, though Cassatt was unaware that his life and Braun's relied on him.

With his last ounce of strength, Braun gave one final instruction. Then he lost consciousness. Overusing Mangekyo Sharingan had severely drained his body, compounded by the dark days in the dungeon and the intense pain inflicted by Boss.

When he awoke, dawn had arrived. Braun, finding himself intact and lying on a pile of straw, sighed in relief. It appeared that Cassatt was alive; otherwise, he wouldn't have been cared for so well.

"It's a pity my eyesight has worsened," Braun sighed, looking at the somewhat blurred image before him and feeling a bit helpless. While Mangekyo Sharingan had immense power, it came with a significant drawback: overuse led to blindness.

Braun continued to lament as a voice resounded in his mind.

"Ding! You can sign in now. Check-in location: Werewolf Cave. Do you want to sign in?"

"Sign in!" Braun replied without hesitation. This time, the sign-in surprised him.

'Ding! Sign-in complete! Congratulations to the host for gaining the reward: Mangekyo Sharingan pupil power +1!'

Braun felt a cool sensation in his eyes, which had been blurred. They had returned to their original state. He could even sense a subtle enhancement in their power.

He never expected that repeated sign-ins at a single location would lead to an improvement in his abilities.

"System! If I continue signing in like this, can I achieve the Eternal Mangekyo Sharingan?"

'Ding! After testing, the host needs to log in here for ten consecutive days to obtain the Eternal Mangekyo Sharingan.'

"Ten days!" Braun grew excited. This was a remarkably short period, considering it took nearly ten years to obtain the Eternal Mangekyo Sharingan in the Naruto world.

With this in mind, Braun resolved to stay and wait for ten days without any hesitation. He would delay his return home, for he knew his parents were deceased. The only blood relative he had left was his grandmother, who resided in Godric's Hollow. She might be unaware of her son and daughter-in-law's fate. Rather than returning immediately, it made sense to recover here and gain the Eternal Mangekyo Sharingan before setting out to assert his dominance.

An excellent plan. Braun lay down peacefully, determined to seize this opportunity.

Though asleep, his body had yet to fully recover. The punch from Boss had likely broken his ribs, and the dull pain in his left rib persisted. Fortunately, the wizard's robust system prevented Braun from developing a fever due to the wound's inflammation. Otherwise, receiving treatment in this wilderness would have been incredibly challenging.

"Master, you've finally awakened!" A surprised voice reached Braun from outside.

A man in animal skins, limping, entered the cave. Braun couldn't see him clearly due to his somewhat blurred vision."