ren after realizing the benefits of tempering body with chakra immediately went home earlier than usual . he didnt greet his landlords and straight went inside his room .
ren was fortunate that his place was in the outskirts of the village because when he used shadow clone technique , his chakra spiked abnormally and this was a very dangerous move. any ninja could have noticed the spike if near him so he was fortunate that in the area about 10 kilometers around his place , no ninja lived here as it was basically a civilian market area. still there would be ninja visiting the shops or patrolling missions so ren was only lucky that at that time nobody noticed the spike in chakra .
ren was at fault from being to excited and forgetting about precautions so after reviewing his mistakes ren now understands that he has to be careful to not alert anyone about him practicing anything .
the process to temper body with chakra was generally divided in 3 types . one is outer body tempering and others are internal organs tempering and full body tempering . actually most of the ninja only practice outer body tempering while tracing as their internal organs also become stronger with gradual increase in strength. but ren wanted to practice full body tempering which almost no one practiced .
the reason was simple. it's because the chakra amount and control requirements were ridiculously high . the benefits of this method was that the body would be tempered at a cellular level very slowly and impurities will be removed making the bloodline purer . the downside was that the chakra amount was ridiculously high and for the impurities to start ejecting, at least more than 30 minutes of constant tempering was required .
even jounins would completely exhaust their chakra in just 10 or 15 minutes much less chunin or genin . so this method was not practiced by almost anyone. for people with strong bloodlines this method was useless as their body potential was already stronger and even if the purity of their bloodline was low , even a kage level ninja wont have enough chakra to temper the body continuously for even more than 10 minutes .
this method didnt require any technique because one just had to accelerate the circulation cycles of their chakra to very fast levels . so the chakra control and mental power required to maintain the circulation speed were ridiculous too alongside with chakra consumption . chakra control was required because if the chakra was violent then the risk of internal injuries or even destruction of chakra network was possible.
but all these requirements could be met by ren simply because he had infinite chakra . now his control and mental power were good too so he could maintain the circulation for slightly more than an hour until his control disrupts due to mental exhaustion.
ren after reaching his room was too excited and immediately wanted to start tempering but he was calm so first he placed non perception seals all over the room. this was a rank D seal to prevent spying on and ren had crafted too many of them to ensure that hokage cannot spy on him with that crystal ball of his . hokage wasn't that free either but it would not hurt to be extra cautious .
ren was satisfied so he did not waste any time and sat cross legged on the wooden floor . he closed his eyes and started circulating his chakra according to the method inside the memories of previous owner . the chakra network was vast so the path of circulation was the same as the one used during the awakening of chakra which previous owner used on the day after he was accepted into the academy.
the first circulation was careful and slow but ren controlled the chakra and the circulation speed increased overtime after each complete cycle. after 17 minutes passed drops of sweat were filling ren's forehead indicating the mental stress but he himself had a peaceful smile on his face .
ren was feeling the mental exhaustion and urge to immediately sleep was assaulting him but ren was disregarding the urge as he felt the feeling of his blood being cleaned . small black impurities were being excreted from the pores of his body and ren could feel the density of his chakra increasing gradually .
ren didnt stop circulating his chakra and the mental burden to maintain the right control was increasing every second . ren saw with his perception that his thin chakra coils were becoming a little thicker gradually and they had become more than 50 percent thicker than before . now the chakra was circulating much more easily as the pathway suddenly became wider reducing some burden of ren.
an hour passed since ren started the tempering and finally his mental power had been depleted almost completely. ren gritted his teeth and somehow managed to drag his heavy feeling body into the small washroom . the impurities smelled very bad so ren being a modern earthling before could not tolerate the uncomfortable feeling . he finally relaxed after the warm water shower cleaned his body but to ren it felt like his soul was being cleaned .
the feeling of liberation after the excretion of impurities was great as body felt very light and filled with strenght . but the feeling of relaxation also amplified the mental exhaustion so ren somehow managed to dry his tired body with a towel and collapsed with his face facing down on the old small bed . ren instantly started snoring loudly and went into the country of dreams while a smile of satisfaction hung on his small face ....