Ikiryō

Ikiryō (生霊, Soul of Living): Ill and bedridden was the past of the young Yashin. He had grown not only in height but also in strength, body strength, and healthier. He no longer wanted to suffer from this matter and it was only through fighting that he had survived. But he could not forget the aid his Auntie, Hanada, offered him on daily base whenever he was sickly ill, close to deathbed. Upon learning that his Auntie had kept him in the dark for his own good, he had been determined to find a way to ease the pain and cure her from the illness. Not that he was pronked to be a medical-ninjutsu or any at all.

But he never succeeded to find a cure for his Auntie nor a relative-lightning based technique to be used for healing before he enrolled the Academy. Of course his Auntie had taught him biology but not to the extern points as the current teacher was telling the class: Anatomy of the human and animal body. He whisked himself to read during the athelic classes and often skipped combat-based lessons to continue to read and define. Eventually the elders disgraced that such a highly profiled boy changed to a "dimwit" that should be tagged as trash, unworthy of the title of Shinobi. Getting the warnings that his grades were dropping to affect his end results, Izaya's health condition worsened. He didn't get unhealthy or ill, but he lacked sleep as he overworked himself after school hours and throughout the night, only getting a few to none hours of sleep on daily base.

All the sleepless hours proved that it was worthy to live in a hell hole of his own. His absent days never went unnoticed by the Sensei that had been commanded to pass any unusual activity to the Raikage. It was a mere debt he owed to Hanada, a deep one, and it would be paid off by taking care of her nephew, distantly. He personally went over to Izaya's place to find a mess of papers with drawings and notes of the anatomy of the human body. It crept him out to see a young boy to be obsessed with the human body even if it was related to medical ninjutsu. Seeing that Izaya was asleep in his chair with his head laying on the desk, he knew the boy would be fine. Knowing of the stories that Hanada told him: "He didn't sleep for days until his mind was rested and either proved himself that it was impossible, or he succeeded. The last one often occurred." Each sketch was focused on a certain part of the anatomy that deepened in the tenketsu and nerves of that area. Added to these sketches were notes that had summaries of the weaknesses and the procedures of what effects it could cause when lightning is injected at the nerves: With the intention to potentially numb or paralysis a limb or muscle fibrillation.

Having memorized the entire anatomy with the notes, Izaya proceeded to shape his lightning in a different form, which required a perfect control over his chakra flow and to release the elemental chakra at the right moment. This was necessarily to produce lightning through the skin like a small needle to disturb the signals with electromagnetic waves, which will directly affect the enemies' muscles and brain. After all, the signals jump from neuron to neuron and eventually to a part of the body that the signal is meant for. Another way Izaya found to use the lightning release is to use different light levels to influence the body to accelerate the natural healing procedure.However, this will have a certain drawback, considering the body is not used to be working overtime. Though, Izaya could relax his muscles out of combat. If in combat, Izaya could increase the rate at which organs processes, if he has mastered the healing form of Ikiryō to a certain degree.

During a training session at the Academy, Izaya had to duel with another classmate that was stronger and better than him in Taijutsu. Luckily Ninjutsu was allowed to be used in the combat session as long as it didn't brought scars along. It was a dangerous experiment to use it in actual combat but he thought it was the perfect opportunity to test it out. He sure had received some blows and exchanged some of his own, disguising his strategy, before Izaya decided that their game was over. Being the slacker of the class, none believed that he was speaking serious. Stunned and surprising feelings is what overcame Izaya as he successfully pierced the skin with his lightning to affect the nerves of his opponent, while the effect immediately applied itself.

Trivia

 * The name is derived from the fact that it affects positively and negatively the human body, to save lives and harmlessly immobilize his opponents. In the beginning this technique was developed to help his Aunt, but failed to finish it on time before she vanished off earth. Nowadays he based his techniques in a more deadlier manner to paralysis his foes and uses his knowledge to deal deadly blows with a mere senbon.