| abstract | - Entei's early life was rather happy despite his family being poor and living in the outskirts of the always rainy Amegakure, and wanted to grow up and become a successful shinobi to give his parents a good life. One day, however, Entei and his family were confronted by a missing-nin that was passing by, and after the missing-nin was prepared to kill Entei's parents, Entei unleashed his dormant power and killed the missing-nin, shocking his parents in the process. Unbeknownst to them, Hanzō had watched the entire scene and desired to have Entei work for him, and plotted to unleash his dormant power. Hanzō hired assassins to murder Entei's parents in front of him, but despite this, Entei didn't unleashed his power and simply passed out from the shock. A few hours later, Entei woke up at Amegakure and was greeted by Hanzō, who explained that he killed the assassins that had murdered his family and told him that if he wanted to avenge them, he should train to become stronger and bring peace to the world. Blinded by his grief and Hanzō's words, Entei accepted and began training under Hanzō, not knowing that Hanzō was the one who caused their deaths. For the next several years, Entei trained restlessly, drastically increasing his abilities. When Entei was twelve, he was promoted to Chūnin and was assigned to many A-rank and S-rank missions by Hanzō and was able to successfully complete them. Eventually, the Three-Tails was informed to be near Amegakure, and in order to have Entei's powers to increase, Hanzō told Entei they would seal the Three-Tails inside his body, and proceeded to make their way towards the beast's location. Once there, Entei and Hanzō battled the Three-Tails and after a long battle, Hanzō successfully used the Eight Trigrams Sealing Style technique to seal the Three-Tails within Entei, and afterwards, Entei became determined in mastering the beast's power to become stronger. One night, Entei overheard some of Hanzō's security guards talking about him, and overheard them wondering if Entei would find out the truth about his parents' deaths, which caused Entei to become curious and suspicious. Entei then confronted them and demanded answers, but the security guards denied knowing anything, but Entei refused to believe them and proceeded to torture them, and after several minutes, they finally revealed that Hanzō was behind his parents' deaths, wanting to unleash his power for his own use. Entei became blinded with pure rage and mercilessly killed the security guards before making his way towards Hanzō's tower. Arriving there, Entei killed Hanzō's guards and personally confronted him, and Hanzō questioned his reasons, but quickly realized that Entei probably found out the truth about his parents' deaths. Entei cursed Hanzō for ruining his life before declaring he would kill him, but Hanzō called Entei a "wasted talent" and was a shame that he needed to die before releasing a large number of explosive tags streaming towards Entei, but Entei unleashed his Lightning Release Chakra Mode to block the explosions before launching a powerful water-made dragon towards Hanzō, but Hanzō avoided, although his tower was completely destroyed due to the attack, which alerted the villagers. Entei and Hanzō then dropped their way onto the center of the village, in the middle of the villagers, and Entei unleashing a wave of electricity from his hands, striking Hanzō and causing massive damage. Hanzō then summoned Ibuse, his salamander, but Entei shocked Hanzō by using his own Summoning Technique and summoned a tiger, and the two summonings battled with one another. The villagers fled from the area after Entei and Hanzō's battle began destroying the area they were in. Entei then launched several dragon-shaped fireballs, but Hanzō blocked them with his kusarigama, but this was only a distraction as Entei quickly charged towards Hanzō with his sword and a sword battle between the two began. Entei then covered his sword with fire slashed Hanzō's stomach, which not only caused a giant cut, but also burned his body. Hanzō then swang his kusarigama high up in the air without Entei's knowledge as Ibuse distracted him, and dropped onto him, piercing through his arm, which allowed Hanzō to take advantage and land several punches and kicks to Entei. As Entei laid down nearly conscious, Hanzō taunted him by saying that if he could, he would kill his parents numerous times, but this caused Entei's anger to reach its breaking point, and caused him to access his jinchūriki form and unleashed his power and rage onto Hanzō, who was unable to fight back, or protect himself and was brought to near death because of the relentless attack by Entei. As Hanzō struggled to get back up, Entei charged a Tailed Beast Ball and launched it, and Hanzō cursed Entei before being killed by the blast, which completely obliterated his body and left nothing left. However, Entei's rampage continued and caused the complete destruction of Amegakure and killed most of its villagers. Several hours later, Entei finally returned to normal, and became shocked and horrified at seeing the destruction of Amegakure and many corpses of the villagers, but couldn't remember nothing about it except from killing Hanzō, and assumed it was Hanzō's fault and fled from the destroyed village afterwards. The news of Amegakure's destruction quickly reached to the Five Great Shinobi Countries, and Entei's involvement was also reported and he was classified as a S-rank missing-nin. Konohagakure's Danzō Shimura became worried that Entei would eventually make his way to the Land of Fire, and ultimately, Konoha itself, and sent a large squad of his Root to ambush Entei and kill him before he could even leave his homeland. About a week later, Entei was walking around his homeland and was ambushed by Root, and Entei recognized the symbols on their arms from Konoha's ANBU squad due to learning it from Hanzō, and questioned their motives for confronting him. However, the Root members refused to answer and simply launched dozens of shuriken at once, but Entei managed to avoid them before charging at them with his Lightning Release Chakra Mode, which allowed him to easily slaughter all of the Root members, and Entei wondered if they were weaker than he expected or Entei himself was stronger than he imagined. The news of Root's slaughter reached Konoha rather quickly, and the Third Hokage, Hiruzen Sarutobi questioned Danzō on his actions, and Danzō claimed he wanted to protect Konoha and told Hiruzen that Entei could eventually arrive in Konoha, but Hiruzen refused to accept his reason and claimed that if he sent any more members of Root against Entei, he would lose his position in the Konoha Council. Realizing that he could trust no one, Entei decided to accept any sort of assignment as long as the client paid a large amount of money to fend for himself and made an announcent for the Five Great Shinobi Countries: should they attack him again, Entei would personally destroy their villages and their inhabitants. For the next several years, Entei made a name for himself in the black market because of his success in accepting dangerous assignments and mercenary work for drug dealers and businessmen. During one of his travels, Entei came across an Uchiha that was in the middle of a mission and after seeing his Sharingan, challenged him and ultimately defeated him. After the battle, Entei proceeded to rip out the Uchiha's left Sharingan eye from its socket, before ripping out his own and placing the Sharingan eye in place of his original eye, gaining the Sharingan's powers for himself. Knowing that the Sharingan's powers increased with the user's emotions, Entei closed his eyes and remembered his parents' deaths and re-created the scene to have him witness Hanzō kill them, which caused Entei's rage and sorrow to increase and allowed him to immediately awaken the Mangekyō Sharingan. As the Uchiha recovered consciousness, he became horrified at seeing Entei with his Sharingan and questioned his goals, and Entei simply claimed he needed to become stronger to protect himself, and claimed he couldn't allow him to return home and inform Konoha of his involvement and proceeded to mercilessly kill the Uchiha by stabbing him in the head with his sword. During the Third Shinobi World War, Entei would get himself involved in the battle between Konohagakure and Kirigakure, and was confronted by Killer B, who separated himself from his brother and their squad. B instantly noticed that Entei was a jinchūriki after sensing Isobu's chakra within him, and asked about Entei's goals in his life. Entei claimed he needed to fend for himself because he trusted no one, and asked B if he had anything in life to fight for, and B claimed he wanted to become the world's greatest rapper. Entei told B he should be grateful he had a goal to fight for and admitted that fending for himself wasn't his life goal and didn't actually had one since his parents died and actually wished someone would kill him to end his suffering and challenged B to a battle and both accessed their Jinchūriki Forms. Because B had more experienced in being a jinchūriki, Entei was outclassed by B's powers and was ultimately defeated. As Entei laid dying from his injuries, B told him that he wished that Entei's life was different because they could've teamed up as fellow jinchūriki, and Entei agreed with him before passing away. Entei's body was later found by Minato Namikaze and other Konohagakure shinobi, and Minato recognized him after seeing his Amegakure forehead protector and decided to bury his body to prevent the enemy from getting their hands on Entei and study his abilities and to prevent them from getting the Sharingan.
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