TEN MONTHS LATER
It's been long 10 months filled with over 100 D ranked missions since Raijin started his new training routine to master his trump card and now, he finally has completely master it and integrated it within his instinct. He would have been mastered it sooner in like 5 months but during this time he has decided to also include shunshin technique in the process.
The process of shunshin no jutsu require the user to increases the speed of his chakra flow inside his chakra circulatory system which vitalises their body and enables them to propel their body forward at an extremely high speed, and this process does not clash with this own technique so after mastering his own technique to the perfection in the fifth month Raijin spent next 2 months on shunshin, first 10 days on mastering it and activating it instantly and spent the next 50 days on reducing the hand seals from 5 to 0.
Raijin then spent next 2 months integrating the mastered shunshin with his mastered technique. During the process he first speeds up the chakra flow inside his coils like shunshin while simultaneously does the steps of his own technique and as a result his base speed is amplified by approximately 2 and half times along with his striking power.
Raijin also discovered a pleasant side effect of the technique. As he was covering his entire body with chakra and compressing it his endurance also increases, although he can't measure it by how much. After completing the combined technique Raijin noticed that chakra expenditure doubled that means a regular chunin if masters it at this stage he/she can only use this for about maximum of 2 time on their full chakra reserves. But Raijin on same chunin chakra level due to having physical and mental energies in balance his chakra expenditure for every jutsu is halved can use this for about 4 times.
Seeing the steep chakra requirement Raijin on the last month decided to further fine tune the process. Before he was covering his whole body in double the amount of chakra required during water walking but now he decided to only allocate double the chakra on the striking places of the body and as a result chakra expenditure went down by 80% that means he can now it for about 30 times for one minute each with his current chakra level. That means being in an empowered state for 30 minutes with full chakra capacity.
Also, during these 10 months Raijin had mastered all three books of sealing technique. The first book took him the longest about 7 months second book which explained how to create different shapes of array and how to combine the individual symbols took him two months and last book explained how to create a single multilevel sealing arrays by overlapping different arrays took him 1 month.
The last book also explained how fuinjutsu work. The creation of a fuin jutsu require three things which are some thing called yin energy, yang energy and natural energy. The yin and yang energies are higher form of chakra, yin represents spiritual & yang represents life. The natural energy as per the name suggest is the energy of the world which is present everywhere.
During the creation process of any seal when the user channels his chakra to the ink brush and draws the symbols using an ink mixed with their blood from which yang energy comes and by combining the symbols in complicated patterns automatically activate yin energy. Both the yin and yang energy are extracted from the users own chakra and merges with the natural energy form the world and activate the seal that's why once even basic a seal like an exploding tag is successfully created it runs automatically without any extra chakra cost.
More complicated the seal more chakra is required so if one don't have large chakra reserves/capacity they can't make high level seal and even if one had gotten their hand on a premade high-level sealing formulae, they can't use it because they will not know which combination tenketsu points is required to activate them.
Raijin was very fascinated and intrigued by the concept of yin, yang & natural energy but he learnt that all the information regarding them was restricted under high A rank clearance meaning he would have to complete at least 5 A rank mission before he would get access to them so he reluctantly put it in his back of his mind.
As Raijin has finished 110 D rank missions, he also has access to 110 D rank scroll from the archives and he had put them to good news. First, he had used fifteen of them to get 3 fuinjutsu books, two chakra control techniques, shunshin no jutsu, False surrounding jutsu, Blood clotting jutsu, five elemental jutsu one each for each element as he did not know his own affinity and the chakra paper used for testing cost about same as an A rank mission pay so he though what the hell and bought one each of all of them.
At first Raijin was not able to decide which one to choose from the available. So, he carefully analysed his own combat system and though about his requirement. So made his choice based on 5 parameters stealth, defence, distraction, attack & subjugation
First or stealth he chose Doton: Dochū Eigyo no Jutsu (Underground fish projection). It's a technique that is used for sneaking and striking silently, like a fish underwater, and then suddenly appearing to the ground's surface.
Then for defence he first decides to select earth wall technique but after reading the description he by passed his and select Futon: Toppa, generally it's used by expelling a gust of wind from the mouth but Raijin decides to modify it by expelling the chakra from all around his body in a spiral while performing the technique. He chose Futon for defence in place of Doton because it does not block his line of sight. As in combat the enemy can use the block for a surprise attack.
RAIJIN
PHYSICAL ENERGY 255
MENTAL ENERGY 255
CHAKRA RESERVE 65025 (Chunin)
CHAKRA CAPACITY (control) 100%