Fan:Spirit Frontier Decem

The Digimon Spin-Off: Spirit Frontier Decem (simply known as Spirit Frontier Decem) is a fanon live-action film idea created by CAJH. It is the sequel to Spirit Frontier and the seventh installment of the fanfictional media franchise idea known as the Digiversum. The story borrows many elements from real-life anime Digimon Frontier. The film was announced in July 21, 2016 and its synopsis was released in January 3, 2017.

Theo Robbins and the other Spirit Warriors find their way back into the Spirit Frontier after two years. Determined to complete their quest and wake Kazuo Komiyama from his coma, they attempt to solve the riddle of the four lost Spirits and prevent the Spirit Frontier from collapsing forever.

Synopsis
(Only the most important details of the plot are written in here, minor details can be imagined by readers themselves. The same thing goes for any possible quotes from the dialogue.)

Seraphimon's past
Seraphimon, one of the Three Archangels, woke up in chains even he couldn't break. He was approached by an evil bestial angel-like Digimon whom he recognized as Cherubimon. Seraphimon asked what had happened and Cherubimon said he had found a new purpose for himself. Seraphimon also asked what Cherubimon had done to the third Archangel, Ophanimon. Cherubimon said that she had not been harmed just yet, but it would happen in time. He also promised that Seraphimon wouldn't live long enough to see it and showed ten Spirits in his hands. He called upon the powers of Darkness, Earth, Wood, Water and Metal to torture Seraphimon and finally kill him. Seraphimon's will was exceptionally strong and he was able use some of Yggdrasill's remaining power to turn himself into a Digi-Egg. Cherubimon took the Digi-Egg and decided to hide it somewhere no one could find it. But several years later, the egg started to send signals and was found by Swanmon who heard a voice that told her to hide it into a Trailmon until one day someone could come to take care of it.

Theo's struggles
After hearing the news about the destruction the Digimon had caused in Berlin only few months after that event, Theo had hoped to get at least some kind of message. But nothing happened back then. Few months later, the Digimon appeared in Detroit, but Theo still received no message. He spent six months on checking every day if he or any of the other Spirit Warriors had received any kind of distress call. But then, he stopped being in contact and became distant from his family again. His parents wanted to talk with him, but Theo didn't want to talk. He couldn't reveal his connection to the Digimon. But then, his little brother Simon asked what this was all about. Theo still refused to answer and told his brother to go away. However, Theo had marked into his calendar application that Simon's birthday is only one week away. That was also the very same day he went into the Spirit Frontier and came back from there.

Recreating the Spirit Lights
In Tokyo, Kaiji Komiyama was once again visiting his own brother Kazuo Komiyama who was still in coma. His parents had avoided giving euthanasia for Kazuo because of Kaiji, but now they were about to lose their hope. They were struggling with payments and they were unsure about letting Kaiji disappear once again. They already believed the story about his visit into the Spirit Frontier, because D-Scanner was a valid proof of it. Kaiji opened up the application and tried to find something from there, but now he saw something strange. Some of the areas from the map of the Spirit Frontier were missing certain places like they didn't exist anymore. And one visible area disappeared from the map before his very eyes.

He immediately sent to a chat in D-Scanner application and told the other Spirit Warriors to check this. Theo was the only one who received the message and checked the map as well. Everything in the application worked very well and the D-Scanner wasn't dependent of real GPS connections. Theo realized that the reason they had not been called back into the Spirit Frontier was because no one could possibly do that. Kaiji remembered how the Spirit Lights created by their future selves are the ones that brought them into the Spirit Frontier on their first time. But this time they couldn't rely on that anymore. They needed to find a way to contact Jonah Sheridan, Gemma Illiano and Osip Ivankov so they can all try to find a way to reach the Spirit Frontier all by themselves. They already chose that the place where they would return to was Swanmon's Shrine of Rebirth which was still on the map.

Returning to the Spirit Frontier
Two days later, Theo and Kaiji had still not been able to reach the others. Osip had no user accounts in social media and Theo and Kaiji couldn't contact Gemma and Jonah without their messages being seen by someone else. D-Scanner was the only thing they could use, but it didn't work. Theo and Kaiji had only one choice. They had to go into the Spirit Frontier by themselves and find out who had created the D-Scanner application. This way they could find out the reason. They already knew that the Spirit Lights can be used to travel in time so no one would notice them being missing from the real world. The two started to meditate and so concentrate on wishing that they could reach the Spirit Frontier. After few attempts, the Spirit Lights appeared in both London and Tokyo, taking Theo and Kaiji into the Spirit Frontier.

They both found themselves in the Shrine of Rebirth, but when the portals they opened with their Spirits were closing, they realized one thing: they didn't travel in time at all. The day in the Spirit Frontier they were in was the exact same day that was in the real world. This must have been because only two Spirit Warriors used their powers. Kaiji was worried that he couldn't stop his brother's upcoming euthanasia in time, but Theo said that they have much more lives to save than just one and decided to worry about their problems in the real world later. Swanmon and Patamon appeared and said how they came in good time. The Shrine was under attack by a Digimon named Gnomemon. According to Digimon Analyzer, it was a Hybrid Level Digimon and Patamon recognized it being a form of the Human Spirit of Earth. Unlike the Spirit Warriors, this one was not a human in Digimon form. But the D-Scanners and Patamon sensed energy from the Dark Craters in Gnomemon.

Theo and Kaiji Spirit Evolved into Agnimon and Lobomon to fight against this new enemy. After being in disadvantage for a while, Gnomemon refuses to fail on his mission and Slide Evolves into his Beast Spirit form Gigasmon. Agnimon and Lobomon immediately change into VritraGreymon and GarmGarurumon, but Gigasmon is still an effective fighter. After fighting for a while, Gigasmon decided to finish his original job: to collect the fractal code of the Shrine of Rebirth. He became shrouded by the same energy the Dark Craters had and the area started to disappear. Swanmon had to put several Digi-Eggs inside a Trailmon which would take them safe. Then, Theo, Kaiji, Patamon and Swanmon stepped inside Trailmon themselves and watched how the Shrine and the ground under it were completely gone.

Kazuo wakes up
Theo, Kaiji, Swanmon and Patamon were not inside Trailmon all by themselves. A holographic apparition of Kazuo was also there. Kaiji was both happy and sad to see him, because it won't be long before Kazuo will die. Kazuo says it would happen anyways if all the fractal codes of the Spirit Frontier will be lost. Patamon told how there are two kinds of fractal codes: ones that act like a counterpart for DNA of the real world and the ones that formed the terrain of every world in the Digiversum. One day, Gnomemon and three other embodied Spirits had appeared and started to collect the fractal codes of the entire Spirit Frontier from both Digimon and the terrain. So, the four corrupted Spirits will come after the Digi-Eggs. But Swanmon had no idea who sent them and what for the fractal codes were needed.

Kazuo says how all six Spirit Warriors are needed to stop them, but to save his own life, he needs his brother's help to return to his body and wake up from his almost braindead like state. Kazuo had the Spirits of Darkness while Kaiji had the Spirits of Light. According to what he heard from Shamanmon, their connection as brothers can help Kazuo awake a power to stabilize the connection between his mind and body which was disturbed by the same Spirit Lights that took his consciousness and Kaiji himself into the Spirit Frontier in the first place. Kaiji tried to meditate once again and both his phone and Kazuo's phone reacted. Then Patamon started to suddenly glow, giving them more power and making Kazuo's apparition and smartphone disappear. Kaiji was unsure if they succeeded, but Theo and Patamon were certain that everything was alright.

In Japan, Kazuo woke up and found his family beside his bed. Kazuo saw how his smartphone had returned from the Spirit Frontier as well. The doctor wanted to check if everything was alright with Kazuo, but Kazuo said how Kaiji needed his help and confirmed that Kaiji's story about the Spirit Frontier was all true. The doctor, who was secretly very surprised of this, told Kazuo to rest and decided to make a phone call to an unspecified number.

Locating the missing three
In the Spirit Frontier, Theo, Kaiji and Patamon left the Trailmon who proceeded to take Swanmon and the Digi-Eggs to somewhere safe. Now Theo and Kaiji needed to figure out how they can contact Gemma, Jonah and Osip. They wondered what had happened, since they no longer answered to any messages sent through the chat in the D-Scanner application. Patamon tried to awake a mysterious power left from his previous incarnation Seraphimon to give the Spirit Lights more power so Theo and Kaiji can find the answer to their questions. Windows showed them Gemma and Jonah in their respective classes, spending more time with their friends. Osip was also having fun with other people in Moscow. But then, Patamon felt pain and realized that what they saw is not real. The three were not in the real world at all, but rather kidnapped by the same entity behind the existence of evil Gnomemon.

Patamon, however, felt a little bit uneasy, saying that amplifying the Spirits with power from one Archangel is not enough to do anything. However, they had still hope because one hatched Digimon had followed Patamon. It was SnowBotamon and Patamon felt how she was a reincarnation of another Archangel. Patamon touched her and they amplified the powers Theo and Kaiji were using. And they started to disrupt the visions Gemma, Jonah and Osip were seeing. The three realized that they were living in illusions and that the Spirit Frontier was still in danger. Theo and Kaiji managed to pull them through the Spirit Lights and the five Spirit Warriors were reunited once more. Gemma, Jonah and Osip had no idea how they had been kidnapped, because one night few weeks ago they had just awakened with a false memory that the D-Scanner didn't exist in their phones anymore. Patamon, however, had something to confess. He knew the culprit behind the appearance of evil Gnomemon and the disappearance of the fractal codes around the Spirit Frontier: an Archangel called Cherubimon.

The story of the Archangels
When it was night, the Spirit Warriors had camped into the forest and SnowBotamon evolved into Nyaromon who became capable of speaking, but didn't remember anything her past. Patamon said how Nyaromon was a reincarnation of Ophanimon. Ophanimon was the one who created the D-Scanner application in the first place, being the one that ensured both the Spirit Warriors coming into the Spirit Frontier and that their future selves would assist her on it. Their previous incarnations had died only few years ago and had been hiding in the Spirit Frontier ever since the other worlds of the Digiversum were devastated by the mysterious disaster.

However, Cherubimon had been slowly mysteriously corrupted by the power of the Dark Craters, and five years ago he was revealed to have found the Spirits of Earth, Wood, Water, Metal and Darkness, corrupting them in the process. The Archangels were somehow to purify the Craters, because some mysterious dark power prevented it. Cherubimon's bond with that same power as well as the Dark Craters had allowed Cherubimon to be the most powerful of three Archangels while Seraphimon and Ophanimon lost much of their own powers. Cherubimon had even created chains that weakened Seraphimon even more, allowing Cherubimon to kill him with the power of the four corrupted Spirits. But now Patamon realized that Cherubimon must have been the one who had lured Kazuo's spirit and consciousness into a Dark Crater corrupt him and bestowing him with the Spirits of Darkness, making Kazuo the fifth evil Spirit Warrior. Duskmon/Velgrmon was already defeated, but Gnomemon/Gigasmon and three others still remained. They needed to be purified and Cherubimon needed to be released from the corruption he suffered from.

Jonah reminded that they were still missing the Beast Spirits of Air, Thunder and Ice. He realized that they would be needed to defeat their opponents, because they had opponents with similar powers. He also hoped he could finally impress Gemma, being still interested of her. While his constant attempts to impress her annoyed Gemma, she agreed that the lost Spirits should be found. Fortunately, they had the means to do that. They just needed to open the map from the D-Scanner application. A powerful yellow signal was detected, likely the signal of the Beast Spirit of Thunder.

Kazuo's interrogation
Once Kazuo had been examined by the doctors, one of them said that Kazuo could be released from his hospital after he agrees to do one thing. There were people who wanted to ask questions from him. The doctor said it was all about everything he had experienced in his state of coma. Kazuo was even more surprised when the doctor said that they knew how everything had something to do with the Digimon. He showed news about what had happened in Berlin and Detroit while his consciousness had been separated from his body. Kazuo, however, was already aware of the events of New York, because it happened before his accident.

Kazuo was brought into a room where a man who claimed to be working for the Network wanted to ask few questions from him. The man wanted to know what truly happened when Kazuo fell in coma and how Kaiji had disappeared three years ago. Kazuo wants the interrogation to be done quickly so he could go help Kaiji, and the man assured how the Network can help Kazuo if they both agree to share their information. Kazuo tells about the existence of the Spirit Frontier which the man assumes is one of the many worlds of the Digiversum. But when Kazuo tells that he and Kaiji are only two of the six Spirit Warriors asked to protect the Spirit Frontier, the man wants to know the identities of these people and how they ended up there, since no similar disappearances had been discovered.

Battle between Thunder and Earth
The Spirit Warriors found their way into a cavern where was an underground lake leading right into the ocean. But Patamon realized that it wasn't actually a normal lake. A fractal code for salt water from ocean had accidentally ended up into the cavern. But that isn't all there is. Parts of a railway had also ended up there with a Trailmon who is barely still alive. The yellow signal seen in on the map in D-Scanner seems come from inside a giant skeleton behind Trailmon. Jonah realizes that the Beast Spirit of Thunder is inside skeleton identified by Trailmon as Whamon. He decides to swim there to get it, but Gemma and Osip want to save Trailmon, believing that there is still something they can do. Theo and Kaiji, however, don't agree with them. They see how the damaged Trailmon has already started to rust and is about to die very soon. Jonah wants to agree with Gemma, but this time he is unable to lie about whether something can be done. He jumps into the water to find the Spirit.

But at that moment an earthquake happens, revealed to be caused by Gnomemon. Theo, Kaiji and Osip Spirit Evolve into Agnimon, Lobomon and Zakumon to fight against it, but the attacks were ineffective. And then Gnomemon Slide Evolved into Gigasmon and attacked the three before they could Slide Evolve too. Meanwhile, Jonah keeps swimming and senses the Beast Spirit of Thunder nearby. It starts to react and then Jonah's phone flies from Gemma's hand into Jonah's hand. Before he could sink underwater, Jonah activates Spirit Evolution and Spirit Evolves into BolgKabuterimon. Agnimon and Lobomon get their chance to Slide Evolve into VritraGreymon and GarmGarurumon, giving them chance to overpower Gigasmon and defeat it. But then Gigasmon starts to absorb the fractal codes of the cave. Gemma is unwilling to let Trailmon die, but Trailmon tells the Spirit Warriors to save themselves.

That is when Patamon starts to suddenly glow, VritraGreymon, GarmGarurumon and BolgKabuterimon start to glow as well. VritraGreymon and GarmGarurumon manage weaken Gigasmon enough to allow BolgKabuterimon to destroy it and purify the Spirits of Earth. The two Spirits are absorbed inside Jonah's phone, but the cave is still collapsing. Gemma sees from the map how three other signals are nearby. They presumed that it was the other three evil Spirit Warriors, but they no energy fight them now. They had to leave the place. When the Spirit Warriors had left, the place disappeared completely and three evil Digimon realized that their enemies had escaped.

Discovery about the Dark Craters
There wasn't any Trailmon moving nearby to give them a ride to the next area. But then they discovered a Dark Crater. They tried to purify it, but somehow a red energy field appeared around it, preventing the purification. Patamon and Nyaromon felt great pain in their heads. They felt that it was caused by the very dark force but much more powerful than those from the Dark Craters themselves. Since purifying the Spirits of Earth was easily done, Theo asked why Cherubimon would care about the Craters than his minions. Patamon said how the fractal codes from areas without Dark Craters were stolen by the evil Spirit Warriors while in other places the Craters themselves were used to drain the fractal codes by Cherubimon himself. He and Nyaromon had seen this by themselves but they weren't aware of the red energy that prevented the purification of the Craters. When the Spirit Warriors previously visited the place the energy didn't exist so Cherubimon must have created it sometime after that.

Cherubimon saw everything through a mysterious red disk he had with him in his castle known as the Rising Morning Star. The three remaining evil Spirit Warriors, Arbormon of Wood, Ranamon of Water, and Mercuremon of Metal arrived with the fractal codes they had drained from the cave, returning the lost fractal codes taken from ocean with them. Cherubimon says how they need the fractal codes of the entire Spirit Frontier to fulfill their role in the great plan. But the second part requires retrieving Patamon and Nyaromon as they were his former comrades. He summons Goatmon, one of his longtime servants to ensure that the Spirit Warriors will locate his castle as a part of his trap. Goatmon reluctantly agrees to do so. The evil Spirit Warriors are tasked to ensure that the Spirit Warriors have a good reason to come.

Finding the Beast Spirit of Air
The Spirit Warriors have found their way into a beach with a sunny weather and no Dark Crater to corrupt it. A powerful purple signal was detected there, presumably the Beast Spirit of Air. But it wasn't long until Arbormon and Ranamon arrived there. A group of Toucanmon who lived in there were loyal fans of Ranamon because of her beauty, without caring if she was evil or not. Gemma was irritated because of people caring about women only because of their appearance and after finding the Spirit, she decided to face Ranamon all by herself. She told other Spirit Warriors to focus on other enemies and used the Beast Spirit of Air to Slide Evolve from her Fairymon form into Shutumon for the first time.

Ranamon was unable to hide her jealousy she towards both Fairymon and Shutumon. Gemma immediately realized that Ranamon's Beast Spirit form must be unattractive. She started to irritate Ranamon hoping that she would show her Beast Spirit form to have a chance against the Spirit Warriors but losing her popularity in the process. Ranamon was conflicted about this, but when Gemma gained the advantage by using both forms alternately she had no other choice. She Slide Evolved into Calamaramon and the result was exactly she feared. The Toucanmon horrified that she had lost most of her beauty in that form. But they had no courage to fight her so they left the Spirit Warriors on their own. Enraged Calamaramon faced Shutumon in another furious battle.

Separated by kidnapping
Meanwhile, the other Spirit Warriors were faced by Arbormon and Mercuremon. Mercuremon was already aware of Ranamon's impatient actions and made sure that his own focus on the mission. Arbormon Slide Evolved into Petaldramon to face Theo, Kaiji and Jonah. But while the three Spirit Warriors Slide Evolved between their Human Spirit and Beast Spirit forms, Petaldramon seemed to trust solely on his Beast Spirit form. Kaiji realizes that this was his weakness and they fought until they knew every single move Petaldramon could use. Thanks to their teamwork, they managed to take the Beast Spirit of Wood away from him, degenerating Petaldramon back into Arbormon who had fighting skills at all. Mercuremon lost his patience and Slide Evolved into Sephirothmon to eliminate Arbormon. Due to Arbormon's death, the Spirit Warriors were now able to recover the Human Spirit of Wood as well.

Sephirothmon was more intelligent and cunning than other evil Spirit Warriors. He tried to capture Patamon and Nyaromon. But Theo came between him. That was when Sephirothmon struck VritraGreymon down, degenerating Theo back into human. He also assisted Calamaramon in defeating Gemma as well. Then the two remaining evil Spirit Warriors captured Theo and Gemma with Patamon and Nyaromon. But then, Nyaromon evolved into Plottmon and its holy powers forced Sephirothmon to let her go. Sephirothmon already had plans for Patamon, but he swore that he would return for Plottmon once he would be ready. The Spirit Warriors had defeated two evil Spirit Warriors this far, but now two of them had been kidnapped and were about to be taken into the Rose Morning Star.

Kaiji, Jonah and Osip cared for Plottmon who now remembered part of her past. She really was Ophanimon's reincarnation and was the one who created the D-Scanner application. She told how she had been captured in a similar way to Seraphimon. But before that she had taken the Spirits of Light and Air under her care from Seraphimon, while the Spirits of Fire, Ice and Thunder had been protected by her all along ever since the Ten Ancient Warriors had been killed. Cherubimon had already been protecting the Spirits of Earth, Wood, Water, Metal and Darkness, allowing him to corrupt when he himself was corrupted. But soon after the Spirit Warriors had arrived into the Spirit Frontier for the first time, Cherubimon decided to finally kill her, but luckily her Digi-Egg was found by Swanmon and Patamon. To end the corruption and prevent the remaining fractal codes of the Spirit Frontier from being taken, they had to reach the Rose Morning Star, Cherubimon's castle. They found a wounded Digimon, revealed to be Goatmon who agreed to take them there.

The interrogation ends
In Japan, Kazuo's interrogation had ended. The interrogator thanked him for the information and agreed to let him go. However, he wanted to see how the Spirit Lights worked and wanted to interrogate Kaiji too after they would return from the Spirit Frontier to confirm his story. He volunteered to take him home by himself. They arrived into house of Kazuo's father where he was waiting for his son. Kazuo took up his smartphone and showed the D-Scanner application. He saw the location of Rose Morning Star from the map of the Spirit Frontier and how the signals of Theo and Gemma were there. He realized that Cherubimon must have managed to capture them. He told his father and stepmother how he needed to return there. They were unwilling to let Kazuo go there since they had just got their son back but Kazuo promised to return with Kaiji very soon.

Battle of the Rose Morning Star begins
Theo, Gemma and Patamon were kept in a large prison cell of the Rose Morning Star. Theo refused to lose hope and wanted to get out. Seeing his determination, Gemma admitted that she had finally started to respect him as a boy and as a leader of the Spirit Warriors despite him being few months younger than her. She also admitted that she wasn't always as confident as she showed herself to be. After the illusion created by Cherubimon's minions was broken and after seeing a dying Trailmon she had felt very saddened. In the real world, Jonah had only been interested of her because of her appearance while other males were treating her as an outsider. Two other girls she had befriended with were the only students who treated her as an equal. But she refused to change herself and Jonah's attempts to impress her inspired her to stand for herself, but Theo, Kaiji and Osip were the first males who had treated her as an equal. The illusion, however, had shown other males treating her as an equal as well. Theo had courage to admit that he had more genuine feelings for her, but that they lived in different continents which would complicate things.

But before they could continue their talk, Kaiji, Osip and Jonah arrived into the castle. But that was when Ranamon and Mercuremon revealed that this was part of Cherubimon's plan all along. Goatmon had been forced to help the Spirit Warriors reach the castle so that Cherubimon can face them himself. But one part of the plan had failed: Kazuo had not arrived there. Cherubimon had shown interest of facing the true form of the Spirit Warriors of Darkness in a battle to have a worthy opponent for himself. But Mercuremon was willing to destroy the other Spirit Warriors for his master. He revealed that he had one day visited Nanomon who acted as a merchant in a place called Autumn Leaf Fair and that is where he found the Beast Spirit of Ice, willing to give it to Osip, but telling how Osip should learn to control it all by himself. But in return, Mercuremon had decided to take something from Patamon: a small fragment of his powers, corrupted with the energy drained from the Dark Craters. That was when Mercuremon evolved into a completely different Digimon that any of his previous forms. It was ShadowSeraphimon, weaker but evil clone of Seraphimon with Mercuremon's colors and traits. Meanwhile, Cherubimon started a new ritual with the red disk he possessed.

Unlocking the final Beast Spirit
Then, the Spirit Lights appeared and a portal opened. Kazuo came through it, ready to join his comrades. He remembered the castle well and sensed how all fractal codes were about to be sucked into the red disk Cherubimon was holding. The Rose Morning Star would be the last remaining place so they won't get another chance to save the Spirit Frontier. Everyone Spirit Evolved into their Human Spirit forms, with Fairymon and Zakumon deciding to face Ranamon and the others decided to face ShadowSeraphimon. ShadowSeraphimon killed Goatmon, because Cherubimon had no use for him anymore. Agnimon, Lobomon, Blitzmon and Lowemon Slide Evolved into VritraGreymon, GarmGarurumon, BolgKabuterimon and EmperorLowemon, but ShadowSeraphimon was still too much for them.

Fairymon and Ranamon were still evenly matched, even when they Slide Evolved into Shutumon and Calamaramon once again. Osip had now his Beast Spirit and he had no reason to feel inferior to others, no matter how old he was. He then learned to Slide Evolve into Blizzarmon but was initially unable to handle bestial aspects of his new form. He was then reminded of the way how Theo learned to overcome his own hardships two years earlier and used that as an inspiration to keep trying. He was able to help Shutumon wound Ranamon who tried to taunt Gemma with her inner fears. But Gemma claimed that she wasn't alone anymore and then Shutumon finally took managed to purify the Spirits of Water once and for all.

BolgKabuterimon became temporarily distracted when Jonah's smartphone started to react. The Spirits of Earth stored inside his D-Scanner application weren't completely purified. ShadowSeraphimon attempted to manipulate them to corrupt the Spirits of Thunder, but managed to create ShadowBlitzmon capable of Slide Evolving into ShadowBolgKabuterimon. ShadowSeraphimon reminded Jonah how he only wanted to impress Gemma because he wanted to feel like he had a fulfilling life and that he was afraid of being lonely. After hearing this, Gemma decided to convince Jonah that while she doesn't like him that way, they are still friends just like other Spirit Warriors. After struggling for a while with his inner thoughts, Jonah finally decided to accept that his feelings for Gemma were completely one-sided and that it was time for him start making decisions based on what is right thing to do. He was able to defeat his evil clone, purifying the Spirits of Earth and Thunder completely.

Defeating the Spirit of Metal
ShadowSeraphimon attempted to take Plottmon's powers as well, but Patamon refused to allow that. He even told that the power of light can't be fully corrupted and how it would be too much for ShadowSeraphimon to handle. ShadowSeraphimon started to control of his powers, and then Patamon and Plottmon started to glow as did smartphones of Theo and Kaiji. Patamon told them to try to awaken the true potential of their respective elements. Theo and Kaiji had no idea how to do that until they realized that they can use both Human and Beast Spirits. D-Scanner unlocked a new function called Fusion Evolution. Theo and Kaiji tried it and this time they evolved with combined powers of Human and Beast Spirits, becoming Ardhamon and Beowolfmon. Their attacks wounded ShadowSeraphimon who lost all the data he had drained from Patamon. He degenerated back into Sephirothmon.

The Spirit Warriors started to launch unified attacks which made Sephirothmon even more confused and unable to defend itself. But they still needed to find Sephirothmon's weakness as it would be the only way to purify the Spirits of Metal. Jonah remembered how the central orb of Sephirothmon's body was the only one it had not used to launch its attacks. This made Kazuo remember some of his time as one of the one of the evil Spirit Warriors. The central orb really was Sephirothmon's weak point. They launched one unified attack right there and that's when Sephirothmon's body started to dissipate, purifying the Spirits of the tenth and final element. But the Spirit Warriors realized how their battle had taken too much time: the Rose Morning Star was about to be the last place where fractal codes still remained.

Cherubimon's purification
Cherubimon is unmoved by the defeat of his minions and decides to interrupt his ritual in order to face the Spirit Warriors himself, leaving the red disk float above the castle filled with almost all of the fractal codes of the Spirit Frontier. The six Spirit Warriors engage him in a combat, with Patamon and Plottmon using their powers to prevent any touch from Cherubimon's powers from corrupting anything. Kazuo had more motivation to defeat Cherubimon than other Spirit Warriors and faced him head on. Cherubimon then starts to use the red disk to manipulate the fractal codes to increase his size and give him regenerative abilities. Because of this, the Spirit Warriors are unable to wound Cherubimon at all since he manages to heal himself every time they try something. Cherubimon then strikes a powerful blow against Jonah, Gemma, Osip and Kazuo, causing them to degenerate into humans.

Theo and Kaiji were deeply worried about this because even Ardhamon and Beowolfmon are no match for Cherubimon on their own. But then, Patamon and Plottmon tell them that they still have a potential to unlock if they are willing to fight and survive. Theo and Kaiji reminded that they had already unlocked the Fusion Evolution, but it was revealed to a form of full potential for one Spirit alone. They next phase can be reached if more than one element is used. Kazuo was willing to give up the Spirits of Darkness for his twin brother. Jonah was willing to do the same with the Spirits of Thunder. They came out of their smartphones and went inside Kaiji's. The Spirits of Water and Steel suddenly made the same thing. Theo already had the Spirits of Fire and Wood stored inside his own smartphone, but then Osip and Gemma relinquished the Spirits of Ice, Air and Earth for him as well. That was when another new function was unlocked in the D-Scanner: Unified Spirit Evolution. Ardhamon and Beowolfmon used to fuse themselves with the Spirits of other elements, becoming EmperorGreymon and MagnaGarurumon.

Unlike everything Cherubimon expected from his opponents, this was too much for him and he attempted to destroy his opponents. But EmperorGreymon and MagnaGarurumon cut off his connection to the red disk which fled into cyberspace. Cherubimon no longer had the advantage and he was furious because he was supposed to be one of the Three Archangels. While he kept fighting his opponents, Patamon and Plottmon sensed how the corruption caused by the red disk had influenced both Cherubimon's body and his heart. There was only one way to defeat him. He had to be killed. EmperorGreymon and MagnaGarurumon pierced his body and went inside to find a core filled with red and black substance. They decide to use their full power to destroy it. This causes corruption from Cherubimon's body to disappear but it also mortally wounds him in the process. Good Cherubimon starts to weep and thanks the Spirit Warriors for purifying him before his body dissipates completely. Patamon and Plottmon ensure that his data reforms into a Digi-Egg as well. It soon hatches into Conomon.

Contingency plan
The Spirit Warriors realize that most of the fractal codes were lost with the red disk responsible for Cherubimon's corruption. But then, Swanmon arrives with a ride from the last surviving Trailmon. The remaining Digi-Eggs are stored inside, but now they had no place where to store them. Patamon and Plottmon were sure that the fractal codes can still be recovered, but until then the eggs had to be send into another world in the Digiversum. Then, all twenty Spirits started to glow and Kazuo remembered how Cherubimon once said that the Spirits can be used to restore the portal connection into any other world in the Digiversum with a fully operational portal system. The Spirit Warriors then used the Spirit Lights and the roots of Yggdrasill around the Spirit Frontier started to glow. The portals would now be able to take them into Digital Middle World or the Kingdom of DigiElDorado. Trailmon went through a portal into the Digital Middle World, taking Swanmon and the Digi-Eggs with him.

After returning to Japan, Kazuo said how the Network was aware of their situation and wanted to ask questions Kaiji as well. He also assured his brother that they can trust him as other humans around the world were already associated with the other worlds of the Digiversum. Patamon, Plottmon and Chocomon (evolved from Conomon) went to find those people in order to make sure that the Network will accept their help. They had also told that there was one was trick in the Spirits that the Spirit Warriors had not yet unlocked so they would be still needed. Gemma and Jonah had started to make new friends at their school and Osip's life was going as well as it had once before, even though they all had to tell about the Spirit Frontier to their families. Theo arrives back into London where he apologizes his brother for missing his birthday this year. Theo was ready to tell them everything about what had happened and opened his D-Scanner application.

Mid-credit scene
The red disk fell into the Digital Middle World where Akihiro Kurata managed to locate it. He brought it before his master, Abaddomon. Abaddomon said how it was time for him to uncover the artifact that was the key part of his plan with the seven "Crests". Kurata asked how it was certain that they would be ready before the Tamers find them. Before diving into the giant Dark Crater of the Dark Pit, Abaddomon said how it was already too late for them to stop their plan unless they would discover one more secret.

Trivia

 * The word Decem in the title is means number ten in Latin, referencing to ten elements of the Spirits.
 * The main focuses of this film are the final battle from the control of all twenty Spirits as well as these certain personal storylines for main characters:
 * Theo discovering whether the Spirit Warriors are still needed.
 * Kaiji wanting to wake Kazuo from his coma once and for all.
 * Gemma and Jonah wanting to get over their social struggles.
 * The idea of having of Cherubimon collecting fractal codes was included in order to ensure more clear connections to Digimon Frontier.
 * Spirit Frontier Decem includes few easter eggs:
 * Battles in New York and Berlin as well as the portal disruption in Detroit are mentioned by both the Spirit Warriors and the members of the Network.
 * A red disk used by Cherubimon was a reference to Lucemon being behind Cherubimon's corruption in Digimon Frontier and the one who wanted the fractal codes to be collected.
 * This is the second Digiversum film with a mid-credit scene after V-Tamer: 2nd Round.

Future
The Spirit Warriors are mostly just mentioned in Digimon 3, but they will have more significant role in Digimon: The Gathering and Digimon: The Descending. Kaiji and Kazuo were mentioned in Digimon 3, while Theo made a small cameo appearance. Patamon, Plottmon and Chocomon (and his Rookie form Lopmon appeared in much larger role. Lopmon will also have a role in Terriermon. Susanoomon will also appear in future.