Reborn as Jon Snow with God System

It had been seven long years since I first entered the training dimension of the gods. Seven years of relentless training, pushing my body and mind to their absolute limits. I had mastered techniques that were once considered impossible for anyone but the greatest shinobi. But today, I had achieved something truly remarkable: the mastery of the 100 Sealing Technique, created by none other than Tsunade Senju, the legendary Sannin.

The 100 Sealing Technique was an incredible feat of medical ninjutsu. Tsunade, renowned for her unparalleled strength and healing abilities, had created this technique to store an immense amount of chakra in a diamond-shaped mark on her forehead. When activated, it granted her an insane speed of healing, allowing her to recover from wounds that would be fatal to any other shinobi. During the Fourth Great Ninja War, Madara Uchiha had once blown a hole through her stomach, but with this technique, Tsunade had healed the wound in mere moments, seemingly defying death itself. She had even claimed that when she used this technique, she was practically immortal.

But I wasn't Tsunade, and the diamond-shaped seal wasn't on my forehead. No, the seal I had created was on the palm of my hand, a symbol of the path I had chosen and the power I had harnessed. For the past six months, I had been storing my healing chakra in this seal, pouring my godly reserves into it. With the vast amount of chakra at my disposal, I was confident that I had amassed more than enough to fully utilize the technique.

The time had finally come to test my mastery. I could feel the anticipation building within me as I prepared to activate the 100 Sealing Technique for the first time. My heart raced as I focused on the seal, channeling the chakra that had been stored for months. The moment I activated the technique, I felt a surge of power flow through my body. The marks from my palms spread like wildfire, coursing across my skin until they covered my entire body. It was as if my very essence was being supercharged, my chakra reserves bolstered to unimaginable levels.

I needed to test this newfound power, to see just how much my healing speed had increased. Without hesitation, I created two wood clones, their expressions mirroring my own determination. I gave them a simple command: attack me with everything they had.

The clones didn't hesitate. They each took up a twin sword and, in a blur of movement, stabbed me simultaneously on both sides of my torso. I felt the cold steel pierce my flesh, the sharp pain radiating through my body. My clones quickly withdrew the swords, leaving four gaping wounds in my body.

Ordinarily, even without the 100 Sealing Technique, I could have healed these wounds easily. My natural healing abilities were already incredible, allowing me to recover from injuries that would leave others incapacitated for days. All I had to do was focus my chakra on the wounds, and they would close up in seconds. But this time, I held back, resisting the urge to heal myself immediately. I wanted to see how much faster the 100 Sealing Technique would work.

To my astonishment, the moment the swords were removed, my wounds began to heal at an unprecedented rate. I could feel the flesh knitting itself back together, the blood vessels sealing shut, and the skin regenerating in mere seconds. The pain was fleeting, replaced by a warmth that spread through my body as the injuries vanished. In less than a second, the wounds were completely healed, leaving no trace of the damage that had been inflicted.

My breath caught in my throat as I realized what I had done. The 100 Sealing Technique had worked even better than I had anticipated. It had taken my already incredible healing speed and elevated it to a level that defied all logic. It was as if I had taken Tsunade's technique and pushed it beyond its original limits, refining it into something even greater.

I had upgraded the 100 Sealing Technique to the next level.

A sense of accomplishment washed over me as I deactivated the technique, the markings on my body fading back into the seal on my palm. I had done it. I had truly mastered the technique and taken it to new heights. But just as I was reveling in my success, a familiar voice echoed in my mind, breaking the silence.

"Ding. Congratulations, host, for not only mastering the technique but even upgrading the technique. For upgrading the first technique, the system gives you a reward."

I froze, my heart skipping a beat. But now, it had returned, and it was offering me a reward for my achievement.

"Reward: Deadpool Healing Factor."

The words echoed in my mind, and for a moment, I could hardly believe what I was hearing. Deadpool's healing factor? The legendary regenerative ability that allowed its wielder to recover from virtually any injury, no matter how severe, and to live indefinitely?

I clenched my fists, feeling a new power coursing through my veins. My journey was far from over, but with this newfound ability, I was ready to face whatever challenges lay ahead. The future was uncertain, but one thing was clear. I was something more, something greater. And with the Deadpool healing factor now at my disposal i can be immortal.