Naruto: Reincarnation With All Existence System

After Ren had finished the first test he had gotten a one day rest period so that he could be in peak condition for the second test. The Elder demon bat just made a hole in the cave for Ren's resting area, but Ren didn't care very much because he didn't expect demon bats to have very well living areas. Since Ren was getting low on chakra this rest period was needed, but he didn't need a whole 24 hours just to get back his chakra, so once he got back his chakra he began to condense his blood again. Then he also used his method to gain more blood cells as well, but this time around Ren did it for a much shorter time than last time because he didn't want to have low amounts of chakra during the second test. After Ren condensed the blood for around three hours, he had been in his rest period for a total of five hours.

Since Ren still had a lot more time to rest and it only took one hour to restore all of his chakra, Ren decided that he would continue doing the blood condensing method. After there were only eight hours left in the rest period Ren decided to have All Existence tell him the average density of the blood in his body compared to a normal person's blood density. All Existence told him that the current weight of his blood was three times heavier than a normal person's blood, and this cost only 100 points. Now Ren decided to finally go to sleep because it had been a long time since he had gotten a full rest. After all, his vitality had increased so much that he barely needed sleep.

Also, Ren made All Existence set an alarm to go off 10 minutes before his rest period ended, and this only cost 100 points. *Time-skip 7 hours and 50 minutes later* Once All Existence told Ren that his alarm went off Ren woke up and then began to do some warm-ups so that he is ready for the second test. After Ren was done warming up the Elder demon bat came into his resting area and told him that it was time for the second test to begin. This time around Ren didn't follow the Elder demon bat farther into the cave, but instead, the Elder demon bat brought him outside of the cave, and on top of the cliff the cave was hidden in.

Once they were on top of the cliff the Elder demon bat told Ren that this test was for testing how much compatibility he had with the demon bat clan's techniques. This test would work by Ren being given three different techniques and then at the end of the day he would be tested in each technique. After the Elder demon bat told Ren what the test was going to be he gave Ren a scroll that contained all three techniques and then he flew back down to the cave. Now that Ren had the scroll he opened it up and looked at the name of each technique.

The first technique's name was sound wave jutsu, this jutsu would use chakra to reinforce Ren's vocal cords and then more chakra would be used to amplify the sound made from Ren. The second technique was sound hypnosis jutsu, this jutsu worked exactly as it sounded, the user would produce a sound that would slowly hypnotize anyone in the area. The last technique was inner vibration jutsu, this jutsu would have Ren build up sound vibrations in his body, and then once he makes contact with someone or something the sound vibrations could be released and would then cause inner damage.

Ren decided that the first technique he was going to learn was going to be the sound wave jutsu because it would be the easiest to test, unlike the sound hypnosis jutsu which would need a living thing to test on and with inner vibration jutsu Ren didn't want to cause permanent damage to his body by being careless with building up sound vibrations in his body. The first part of doing the jutsu was using chakra to enhance his vocal cords, so Ren began practicing by using chakra to enhance his arms, and then once he got that down he began to enhance specific parts of his arms. Since Ren was already at special jounin level at chakra control and it increased from trying to use chakra to sense yesterday, it only took ten minutes for Ren to be able to enhance very small parts of his body without causing any damage.

The next step was to be able to amplify sound with his chakra so Ren first practiced doing this outside of his mouth by clapping his hand together and then Ren imbued chakra in the sound wave. Once Ren imbued the sound wave with chakra Ren saw the air all around him being disrupted and then he got and all his surroundings got hit by the sound wave. Since Ren's physical body was so strong the sound wave didn't cause much damage to him, but the rocks around him now had cracks. Ren was able to tell that he slightly failed when doing this because he amplified the whole sound wave, but instead he should have amplified the sound wave where he wanted to hit.

After doing some testing for 10 minutes Ren could now choose where to amplify the sound wave and could aim it. The last step that Ren needed to take was combining the first and second steps together. So Ren enhanced his vocal cords and then made a screech and once he made it he used chakra to amplify the sound wave as well. After Ren did this he saw that a small amount of air in front of his mouth got disrupted and then the rock in front of Ren now had a giant crack in it.