Dumon Dumon , known as Durbe in the Japanese version , is an Emperor of the Barian World in the " Yu - Gi - Oh ! ZEXAL " anime . After the disappearance of Nash and Marin , Dumon assumed leadership of the five remaining Barian Emperors in an attempt to protect the Barian World from Astral . He was later absorbed by Vector when attempting to protect Marin . He and the other Barian Emperors were revived and revert back into his true human self by the power of the Numeron Code following Yuma ' s and Astral ' s final Duel . Dumon is the only Barian Emperor that never Dueled in his human form , or against Yuma Tsukumo . Design . Appearance . Dumon appears most often under his gray cloak and has grey eyes that glows red . In his Barian form , his skin is of a wisteria color , he has short gray hair , two blue markings on the sides of his face and silver armor plating with blue gems covering different parts of his body , with a Barian Emblem found on the right side of his chest . Unlike most Barian s , he has a visible nose in his true form and his eyes are completely gray , with no visible pupils . When on Earth , his appearance is that of a bespectacled boy with short , gray spiky hair , wearing a black vest over a white shirt , black pants , a Baria Crystal on his right wrist and a scarf tied around his neck . He would also come to use his former comrade ' s name , Nash , as his alias when in human form . Following his revival after Yuma Tsukumo and Astral ' s ceremonial Duel , Dumon attends Heartland Academy as a third - year student , thus wearing the standard blue - lined uniform , blue pants and brown shoes . In in his previous life , Dumon was a legendary knight and accordingly wore silver armor with a white cape . Unlike the human form that he took on in present - day Earth , Dumon did not wear spectacles . Personality . Among his allies , Dumon is shown to be the most level - headed among them and was at one time their leader . He is shown to care about his fellow Barian s greatly , often voicing his high opinion of them and usually letting them know that he has faith in them before seeing them off on their mission . Dumon is very loyal to the Barian World and prioritizes its safety above all else . Likewise , he is extremely loyal to the original leader of the Barian World , Nash , going to great lengths to find and restore him to his original position within the Seven Barian Emperors . This appears to have stemmed from their previous human lives . Dumon is also shown to intimidate the other Barians , especially Alito , whom complained about the mission he received , but complied when Dumon used a strict tone . He also seems to dislike confrontation as he often puts an end to arguments and fights between his comrades , though this did not stop him from threatening to put an end to Vector with his own hands if the latter did not stop acting alone . He is not averse to praising his enemies , as he did during his Duel with Shark , where he complimented the young man ' s determination and Dueling skills . He was also willing to sacrifice his life in order to protect his comrades , as seen when he was trying to used his " Celestial Rage " to end his last Duel against Vector in a draw , as well as using " Sacred Shield " to protect Marin , even though it meant his death . Etymology . Dumon ' s name is derived from , also known as Dubhe , a star located in the asterism . His alias in human form , " Nash " is derived from another star in the same asterism - , also known as Benetnasch . Abilities . Dumon , like the other Barian s , has been shown to teleport using portals . Dumon has also been shown to generate a large energy ball which he can use to fly . Dumon is one of the few Barians who can stay in his true form , even on Earth ( though he was in close proximity to Number ruins at the time ) . The only exception is when his Baria Lapis is damaged . Biography . History . Long ago , Dumon was a knight who served to protect a kingdom he lived in along with his pegasus , Mach . He was friends with the ruler of the United Lands of the Poseidon Ocean , Nash . When Nash ' s kingdom was attacked by Vector ' s forces , Dumon arrived to assist . He was targeted by Vector ' s archers , but he and his pegasus were too quick to be hit by the arrows . Nash ' s sister Marin was taken by the ocean god that Vector Summoned , Abyss . Dumon attempted to save her , but Marin pitched herself from Abyss ' hand , sacrificing herself to call forth another . Dumon then stood by Nash ' s side as he mourned his sister ' s death . He then assisted Nash ' s army in assaulting Vector ' s once more . The assault led them to a town Vector ravaged on his way , which sickened Dumon as he allowed his people to live in such conditions . As the war between the two kings prolonged , Dumon and Nash planned to confront Vector and his military once they reached his location . Dumon fought and lead Nash ' s army in the battle and was the only known survivor . At one point in his life , Dumon obtained a card called " " . Eventually , he returned to his homeland , but learned about how his fellow knights had grown arrogant and plotted to usurp the King . Dumon and Mach intercepted the other knights and tried to reason with them , but Dumon failed and the knights turned their swords on him . Since Dumon was unwilling to kill his former comrades , both master and steed were eventually defeated and killed . However , Dumon ' s fellow knights regretted their actions and they buried him and Mach together . The knights had been hyponotized by Don Thousand in an effort to cause Dumon ' s rebirth as a Barian . An unknown number of years later , Thousand reincarnated him as one of the Seven Barian Emperors , as his soul was one that was connected to a Mythyrian " Numbers " card , which had sealed Thousand ' s power . Dumon had no memory of his previous life , due to the " Over - Hundred Number " that he received from Don Thousand . After their leader , Nash ' s disappearance , Dumon assumed command of the Barians . The Emperors plotted to obtain the Numeron Code before Astral by gathering the " Number s " . Due to both worlds being made of energy , they could not interact , so they could not take " Numbers " directly . After Vector ' s plan of using humans such as Vetrix and Dr . Faker failed , Dumon determined they would have to intervene themselves . Yu - Gi - Oh ! ZEXAL II . Barian Invasion . With the defeat of both Vetrix and Dr . Faker , as well as the supposed death of Vector , Dumon determined that they would have to accomplish the mission themselves . To that end , he sent Girag to Earth , who began the new plan by brainwashing Fender and his subordinates as their first new agents . Following Girag ' s failed attempts to acquire the " Number s " , Dumon began to feel frustrated at the lack of good results and summoned Alito . Dumon ordered Alito to gather the " Numbers " , however Alito rejected the mission as he claimed he could not fight to his fullest nor maintain his true form on Earth and that it would be boring . Dumon ' s eyes glowed , which intimidated Alito enough to make him go . Mizar appeared shortly afterwards , questioning Dumon on his reasons to send a " simpleton " like Alito to gather the " Numbers " as the future of the Barian World depended on it . Dumon merely responded that despite his flaws , he ' s an excellent Duelist and should have no trouble and that even a failure would bring them more information . After the constant failures of Girag and Alito , Dumon decided to send Mizar to Earth in order to Duel Yuma . He gave him three Barian Sphere Cube s , two of which he was to give to Girag and Alito . Dumon put full trust in him , hoping he would produce better results than the other two . Later , Dumon and Mizar looked after a comatose Girag and Alito , who were healing in Baria Crystal s . Dumon remarked that only he and Mizar remained . It was then that Vector appeared to them , surprising them . When Mizar angrily tried to attack Vector , Dumon restrained him and told Mizar to calm down . Dumon blamed Vector for his failure , but Vector claimed his plan went exactly as it should have - up to and including his loss while possessing Faker . The three discussed what to do next , with Dumon ultimately agreeing to let Vector proceed as he planned , but warned him to stop acting on his own . Vector ' s plan eventually resulted in Yuma , Astral and their allies boarding the Different Dimension Airship and attempting to reach the Barian World to rescue " Ray Shadows " . The Barians sent monsters after the ship , and though the occupants fought them off , the ship crashed at " Sargasso the Different Dimension Battlefield " , where Dumon waited with Vector and Mizar . Dumon took on Reginald Kastle and allowed him the first turn , and then watched his opponent take damage from the effect of " Sargasso " . As the Duel continued , Dumon managed to Xyz Summon " " as well as protect himself from " Sargasso " using " Sargasso Lighthouse " . Seeing how skilled Shark was after he Summoned " " , Dumon complimented him , and stated Shark ' s way of speaking and soul reminds him of a certain person . As Vector and Yuma ' s Duel reached its climax , Dumon neglected his own Duel to watch theirs and questioned Shark about Yuma , for he was interested in how much the former believed in the boy . After the power surge of ZEXAL II caused " Sargasso " to self - destruct , Dumon was forced to cancel his Duel with Shark and retreat back to the Barian World . Mythyrian Numbers War . Back in the Barian World , Dumon and Mizar saw that their home was crumbling around them and took it as sign that their time was ending . When Vector appeared , Dumon learned of the seven Mythyrian " Numbers " and got their locations from Mr . Heartland . Dumon was about to set out , but Vector mentioned that Nash might still be alive in the human world and he might be able to find him . Dumon then left through a portal , determined to collect the " Number s " first , but also wanting to look for Nash . As Dumon traveled through the dimensional rifts , he thought about Nash and lamented how Nash would never let similar events to their current situation happen . He eventually crashed into the Different Dimension Airship , causing both him and the airship to exit the rift around one of the desired locations . Dumon woke up in his human form , injured from the crash and saw that his Baria Crystal was damaged - making him unable to use his Barian powers - and was about to be attacked by a bear . He then gained a debilitating arm injury . He was surprised when Yuma suddenly saved him from it . Upon their meeting , Shark questioned who he was . Dumon said that his name was " Nash " and he was on vacation . Even though neither Yuma nor Shark recognized him as Dumon , Shark was still suspicious . Shark tried to convince Yuma not to trust him , but this conversation was cut short after the group heard Tori Meadows ' scream from some distance way . They arrived at a temple and reunited with Rio Kastle and Tori Meadows ( after getting rid of some snakes ) . In one room , Dumon saved Shark from being crushed by a wall coming down , but they got separated from the others . When a door opened up , Dumon and Shark went into the path , leading them to an empty room . Shark thanked Dumon for the rescue , but said he still didn ' t trust him . Dumon shrugged it off and he did it in return for Yuma saving him . When the walls started to close in , they were captured and their lives depended on the outcome of Yuma ' s Duel with Mach . Dumon and Shark were forced to work together to survive the collapsing and changing labyrinth . Following Astral ' s instructions , Dumon read the inscriptions on the walls of the ruins , which told of a legendary hero and his Pegasus . The legend stirred a feeling in Dumon , who believed that something was familiar about the legend . Although some of the runes were faded , Dumon knew how the story ended and the message behind it : Protect your friends . When the floor collapsed , Dumon saved Shark from death . When their hands touched , Shark began to glow and Dumon ' s Baria Crystal was repaired . Revealing himself and transforming , Dumon pulled Shark up to safety . With the information from the legend , Dumon advised Yuma to protect his " " , which helped him defeat Mach ' s " " . Yuma thanked him for his assistance , but Dumon insisted was that they would be enemies the next time they met and after that he teleported away . Later , Vector called Dumon and Mizar back to the Barian World and informed that Alito and Girag had awoken , much to their surprise . He was also stunned by Alito ' s new arrogant attitude towards him , but their conversation was cut off when Mr . Heartland interrupted them . Heartland told the group of the new " Number " location and that Yuma might be aiming for it as well , and Dumon looked on as Alito left to retrieve it . Later , Dumon pondered over the connection between the seven " Numbers " and the Seven Barian Emperors . When Mizar arrived to inform him that he found another Number ruins , Dumon lamented how they lost most of the " Numbers " to Astral and his group . Dumon then shared to Mizar his conclusion about the ruins ' legends implied that they were humans once , but Mizar refused to believe this and left Dumon in search of the " Number " . Some time later , Dumon met with Mizar again and Mizar confirmed that the " Number " spirit had said he was once human , though Mizar refused to believe it . Dumon claimed he couldn ' t believe it either , but wished to continue investigating the ruins to find the legends of Nash and Marin , as their return could shift the situation to the Barians ' advantage . Dumon arrived at the Different Dimension Airship and found out from Tori that the rest of the group had gone underwater . Dumon followed and eventually met up with Yuma and Astral . Dumon challenged Yuma to a Duel to settle things , insisting it was their destiny to battle , but Yuma asked why he wanted to even there was no real reason to fight and Dumon helped them in the past . Dumon told Yuma that he was wrong and claimed he did not believe the legends that told the Barians were once human . When Astral asked Dumon why the final two Barian Emperors had not shown up yet , he told him that Nash and Marin were the leaders , but they vanished some time ago . Seeing Shark ' s Duel with Abyss in progress , Dumon left to watch it and was able to view the memories of Shark ' s past life . Dumon expressed surprise upon seeing that he was friends with Shark as well as seeing the Barian Emblem around Shark ' s neck . Upon Shark ' s summoning of the , Dumon began to suspect that Shark and Rio were Nash and Marin as he left the ruins . While Yuma journeyed through the Astral World , Dumon had a brief talk with Mizar again , concerning the past life matter . He concluded that there was no way around it and that they must have had previous lives . He then appeared in Rio ' s hospital room , where Shark was , shocking the latter by calling him " Nash " , expressing his theory that Shark is Nash . He then used a Barian Emblem to take Shark and Rio to the undersea ruins once more where Shark witnessed another more of his past life ' s memories . Shortly Shark saw how his past life ' s war with Vector ended , Dumon appeared before Shark along with Rio in form of an apparition . The Barian Emperor told Shark that he had finally understood why Shark was reborn as the leader of the Barians . Dumon transported Shark and Rio to the Barian World to meet Nash ' s army and Iris . He told Shark that the war with Astral World will continue until one side is destroyed . He stated that Shark was the only one who could end it , even if it meant breaking his bond with Yuma and his friends , calling him " Nash " and Rio " Marin " . A meeting was called and all the Barian Emperors gathered . Dumon looked on as Vector expressed his shock that Nash and Marin were alive . Dumon explain to Vector that they ended up Earth as the Kastle twins , with their memories gone . He went on to ask Vector if the current situation on Earth was his doing , since only Don Thousand would be able to merge the worlds , but Vector suggested that Mr . Heartland must have revived him . After Nash granted each of the Barian Emperors new powers , he then consented to Vector ' s plan of attacking Earth now . Barian Emperor Onslaught . After Mr . Heartland was defeated , the Seven Barian Emperors arrived together on Earth in front of Yuma and commenced Barian Battlemorph . After Yuma was rendered unable to Duel when the Emperor ' s Key reacted with Nash ' s Barian Emblem , Roku and Kaze arrived and pelted the Emperors with smoke bombs , allowing Yuma ' s group to escape . The Emperors gave chase , with Dumon being confronted by Dextra , who he recognized as the " wench " that Vetrix had Dueled during the World Duel Carnival . As the Duel went on , he called her a stubborn opponent as she claimed he had yet to see her true ability . Eventually , Nash led the Emperors in a Chaos Draw . This allowed Dumon to use " Rank - Up - Magic - The Seventh One " to bring out " " . As he defeated Dextra with it , he complimented her and told her to rest now as her soul was sent to the Barian World . After Nash ' s victory over Quattro , the Emperors regrouped and Dumon commented that the other remaining " Number " holders were Yuma , Astral , Kite , Trey and Quinton . Nash ordered the Emperors to split up and pursue them . Dumon traveled with Marin and they were soon alerted to a Duel ' s start when they saw " " in the sky . They quickly headed to that location to find Mizar Dueling Trey and Quinton . Mizar told them he was fine and that they should move on and pursue Yuma and Kite . Trey and Quinton then used the power of their bracelets ' crest s to generate a Sphere Field , trapping the three Barians there . Mizar still told them not to interfere , which they obeyed and continued to watch they Duel . After the brothers managed to seal " The Seventh One " by equipping Mizar ' s " " to " " , Dumon commented that " The Seventh One " should be unstoppable , with Marin adding they had indeed found its one weakness . He was shocked when they managed to reduce Mizar ' s Life Points to only 1 with " Chaos Atlandis " . Mizar finally manged to recover " Tachyon Dragon " and Summon " " to defeat them . The Sphere Field faded and Mizar told Dumon and Marin that he was heading to the moon to find Kite , after hearing of the legend the latter had gone to investigate . When Dumon and Marin arrived in the Barian World , they were greeted by Vector . He informed them he intended to unite the power of the Seven Emperors . Dumon responded that the seven were already united , but Vector corrected him , saying he would absorb all of their powers for himself . Vector revealed that he had revived Don Thousand and that the Seven Emperors were simply his pawns to begin with . Dumon pointed out that that applied to Vector too , but Vector claimed that with Thousand ' s power , he was a god himself . Dumon suggested Marin flee to inform the others , but Vector clarified that Alito and Girag were working for him . The three Dueled in a Battle Royal style , though Marin and Dumon combined " " and " " to destroy " " . However , Vector Summoned " " and equipped " Dark Mist " to it before recovering his Life Points using the Continuous Spell Card " Don Thousand ' s Throne " , which drew its power from Nash , who is held captive within a Sphere Field , which in turn increased the monster ' s ATK and deals damage to Marin . Vector revealed his " point " system and the fact that he had killed Nash and Marin previously . Marin , enraged by Vector ' s words , used " The Seventh One " to bring out " " . Dumon nearly defeated Vector and himself with " Celestial Rage " and " Archfiend Seraph " , but he was countered by " Evil 1 " . Using " Sacred Shield " , he increased the ATK of Marin ' s " Ragnafinity " and took himself out of the Duel , expressing his thanks to Marin and Nash for being his friends in both lives . He reverted to his human form and faded away , his soul being absorbed into Marin . Despite Dumon ' s sacrifice , Marin was unable to win , as " Don Thousand ' s Throne " enabled Vector to Rank - Up " Manipulator of Souls " into " " , which defeated Marin . Vector absorbed Marin ' s soul afterwards , gaining Dumon ' s in the process . Dumon ' s soul appeared with Marin ' s , Girag ' s and Alito ' s when Vector full absorbed their powers during his Duel against Nash . During Nash ' s Duel with Yuma , Dumon ' s soul appeared to support Nash alongside those of the other Emperors after Nash overlaid their " Chaos Over - Hundred Numbers " to create " CXyz Barian Hope " . Like the rest of the Emperors , Dumon was later revived by the power of the Numeron Code and revert back into his true human form . He enrolled in Heartland Academy as a third - year student . Later , Dumon , the Emperors , Kite and Tori traveled with Yuma to the Astral World to help Astral with a new crisis . Deck . Dumon uses a " Star Seraph " Deck , focused around quickly summoning his ace monster , " " through cards such as " Star Seraph Sage " and " Star Seraph Scout " . He later gains the ability to perform a Chaos Draw to use " Rank - Up - Magic - The Seventh One " , allowing him to Rank - Up " Star Seraph Sentry " from either his Graveyard or Extra Deck and Summon .