ARC - V ( machine ) ARC - V Reactor , known as ARC - V in the Japanese version , is a device that appears within Duel Academy in the " Yu - Gi - Oh ! ARC - V " anime . Leo refers to it as the " fifth dimension " . Overview . The machine was briefly seen absorbing thousands of cards into itself . At the time , the machine was being observed by Leo Akaba . History . Leo Akaba constructed the machine for the purpose of uniting all Four Dimensions and reviving his daughter , Ray , by fusing her reincarnations back together ( In the English Dub , it is also stated that the process will destroy the girls ' physical bodies and erase their souls from existence . ) . In order for the process to work , Leo ordered his followers to card thousands of people in Xyz Dimension ( and eventually extended to Standard Dimension ) into cards to use their life energy to power up the machine . At this time , he tasked Dennis McField , Yuri , and Sora Perse to find and capture Ray ' s reincarnations , signified by the Four Dimension Bracelets that each of them possess . Yuri successfully captured Rin and Lulu Obsidian , but was unsuccessful with Zuzu Boyle as her bracelet prevented him from coming close to her , and his plan was further delayed after Celina escaped into Standard Dimension . Later , after Celina was brought back by Barrett and brainwashed by a Parasite Monster , Leo used her to lead a troop to capture Zuzu . After disposing the Doktor and freeing the girls from the Parasite Monsters , Leo also transported the four girls inside glass tubes to the machine with four of them surrounding it . The operators then started the machine , gathering energy to sufficient levels , before sucking out the girls ' life energy at 50 % , destroying their physical bodies and souls , and finally transporting each of them into ARC - V to begin the Unification Procedure , starting with Zuzu at 60 % , followed by Lulu at 70 % , then Rin at 80 % , and finally Celina at 90 % , with the dimensions corresponding to each girls being absorbed at the same time . Once the reactor ' s power reached 100 % the four dimensions will reunite and Ray will be restored to her original form . However , being impatient , Leo ordered the transfer of Lulu before the energy reaches the sufficient level at 70 % and Celina ' s transfer before the energy reached sufficient level . This greatly impacted the outcome as ARC - V was activated at full power , Ray was not yet revived because of the girls ' ( apart from Zuzu ) not being properly transferred , and the four dimensions slowly started to become one . However , the machine eventually recreated the Natural Energy Cards and revived Ray in her spirit form with the spirit of Zuzu residing inside her . Following the battle against Zarc and the Standard Dimension rebirth into the " Pendulum Dimension " , the four dimensions were split again but remnants of ARC - V remained . This created Interdimensional Corridor Gates , connecting the dimensions with one another . Ray ' s fate was also unknown but Declan theorized that she most likely still inside the remnants of ARC - V . Leo managed to collect what appeared to be Ray ' s spirit , though he was unsure that it was Ray and theorized that Ray ' s fragments would eventually revive as Zuzu Boyle while he theorized that what ' s remains of Celina , Rin , and Lulu had perished . Ultimately as Yuya Dueled several of his allies in order to restore Riley ' s smile as she was rendered as a catatonic infant , he faced Declan in a final Duel to test his qualification as a pro . Yuya succeeded in defeating Declan which in turn Riley ' s smile back and purifying Zarc , allowing Ray to be reborn as Zuzu after reacting to the Duel . Although Celina , Rin , and Lulu ' s physical bodies perished due to Leo ' s action , their spirits miraculously survived and is now residing within Zuzu ' s .