Battle Space

Biodata

Origin and Mechanics

The Battle Space activated when news of Kagami Uchiha’s death triggered Uchiha Yi’s Sharingan awakening. Yi enters it with his consciousness and returns to reality after a battle 2 3.

• Opponent selection: The space refreshes monthly and generates opponents drawn from different points in their lives. Documented selections have contained either four or five opponents; Yi cannot choose who appears 2 11 49 152 367.
• Rewards: Defeating an opponent grants a random attribute or ability from them. Recorded rewards include chakra, physique, eye power, talents, techniques and combat knowledge 2 12 24 36 368.
• Integration: Yi chooses whether to integrate a reward. Indra’s Chakra took effect almost immediately, while integrating Nawaki’s and Asura’s physiques caused intense but brief pain 3 12 116.
• Limits: Yi cannot choose which reward a victory gives or transfer a reward to someone else. After losing his remaining challenges against the first selection, he could no longer challenge those opponents in the Battle Space 2 8 299.
• Battle conditions: Yi can use equipment such as explosive tags inside the space. Its bounded battlefield can restrict the usefulness of escape techniques such as Flying Thunder God against wide-area attacks. Yi also treats the space as a place to test costly techniques without their usual consequences carrying over to his body outside it 3 73 115 153.
• Virtual opponents: Yi understands the opponents as recreations of people at particular points in history; what they learn during a Battle Space fight does not change their counterparts outside it. Some battles require him to kill an opponent rather than merely incapacitate or seal them 222 374.

Power Progression

Recorded Victories and Rewards

Challenge Limits

• Yi’s first selection included four opponents he judged beyond him; after defeating Sasuke, he lost his remaining challenges against the others. He could put up a fight against Izumo Kamizuki but lacked the experience to win 2 8.
• Later defeats against opponents including Obito Uchiha, Kimimaro, Itachi, Tsunade and Sasori demonstrated that the Battle Space could generate fighters far above Yi’s current strength. He was beating Gaara until Gaara released the One-Tail; a later encounter with Fourth Shinobi World War Gaara also ended in defeat despite Yi’s growing use of Flying Thunder God 24 73.
• Even after reaching Kage-level strength, Yi was defeated by Valley of the End-era Madara and the Six Paths of Pain. The Battle Space’s confined battlefield prevented Flying Thunder God from guaranteeing victory against an opponent with wide-area attacks 76 115.
• Battles can teach Yi even without a reward: his fight with Nawaki exposed how easily a wounded opponent’s explosive trap could catch him off guard. Against young Tobirama, Yi accepted injury to secure the victory. He later studied Haguki’s taijutsu and Hamura’s fistwork and Six Paths Sage Mode during their fights 12 50 157 301.
• The value of rewards changes as Yi grows. By the time his body had become exceptionally powerful, ordinary ninja offered him little improvement, though Hashirama’s Sage Body showed that even a familiar kind of reward could still make him stronger 299 367.