Azesion-Dilhade War

Azesion-Dilhade War is a war that occurred between the human continent of Azesion and the demon kingdom of Dilhade. The conflict was orchestrated by Commander Jerga in an attempt to exterminate demonkind, but it was stopped by Anos Voldigoad and his allies before it could escalate into an all-out war.

Prelude
After the Great War ended with the Demon King Anos' sacrifice, magical barriers were erected to isolate the four races so that their hatred would disappear in due time. Knowing that the Demon King would return, Jerga founded the Hero Academy to pass on his hatred to future generations. He falsified the events that occurred, such as the Hero Kanon slaying the Demon King and raising the walls to protect the allied races from demon retribution. However, history books alone wouldn't be able to pass on the hatred they felt, so Jerga split his source into two magics: Jerga and Eleonore. As magic, Jerga instilled his hatred into the hearts of those who used Aske, while Eleonore was used to raise an army of cloned heroes.

Many supported Jerga due to the atrocities the Demon King committed during the war, but Hero Kanon opposed this since he was aware of the Demon King's true benevolence, so Jerga's supporters killed him as a result. However, the hero was able to fake his death and move to Dilhade, whose citizens were more understanding. His plan was to create a phony Demon King, Avos Dilhevia, to take the full brunt of humanity's hatred. He used Evansmana to sever Anos' fate as the reincarnated Demon King of Tyranny, completely erasing his name from history. Those who could not forget moved away from Dilhade and remained quiet until it was over, while the Hero Academy simply believed he had changed names. As part of his plan, six of the Seven Demon Elders willingly ceded control of their bodies to Kanon's other sources. With his remaining source, Kanon would reincarnate throughout the years as he made counter-plans of his own.

Declaration of War
Two thousand years later, when the Demon King was expected to return, the Demon King Academy and the Hero Academy held an educational exchange. While Dilhade saw this as a learning opportunity, Azesion used this opportunity to humiliate the visiting demon students and create justification for war. At the same time, Lay Grandsley, Kanon's latest reincarnation, sent the remaining three Demon Elders under his control to Gairadite. Together, they attacked the hidden temple where Evansmana was enshrined and reclaimed the holy sword, giving Diego his highly coveted justification. In Azesion, after the theft of Evansmana, Anos located the imprisoned Demon King Academy students, as they witnessed Diego's broadcast where he revealed that the "deepest darkness" has returned as the Demon King of Tyranny Avos Dilhevia stole the legendary holy sword along with his subordinates, three of the Seven Demon Elders. He lamented the theft of the holy sword and the fact that even after the war had ended, he had tried to extend a hand of friendship by holding the educational academy exchange. But the demons took advantage of his kindness and stole Evansmana and invaded human lands. He told the citizens that the king of Gairadite had reformed the Demon King Subjugation Battalion, which once defeated the demon king, as he proclaimed himself as Kanon's descendant and true reincarnation. Meanwhile at the same time in Dilhade, Medoin Garsa, Zoro Angart and Eldora Zaia projected a magical broadcast to reveal that they had discovered the reincarnation of the Demon King of Tyranny, as Avos Dilhevia revealed himself in front of the citizens of Dilhade. He proclaimed his return as stated that he had sacrificed his life to divide the world and spared the humans out of mercy. Medoin showed a projection of the Diego's magical broadcast, and Avos stated that humans held on to the Sword of Three Races to destroy him, developed new techniques to kill demons and trained an army in the guise of the Hero Academy. He proclaims that there was no saving such foul, abhorrent fools. Revealing the stolen Evansmana, Avos proclaims that he has obtained humanity's greatest weapon, as his descendants didn't have anything to fear. He then announced his intention to destroy humanity with the aid of his followers. Anos meet with his followers to discuss the fallout of recent events as they discussed how to stop the incoming conflict. While Anos initially wanted to fight alone, his friends and followers convinced him to let them fight as well. Before the grand battle, Lay reassured Misa and asked for half of her one-shell necklace due to a popular legend stating that it could reunite lovers in the afterlife.

The Battle
Both human and demon armies set up encampments on their own side of the border in the Tola Forest, as it was only a matter of time before they clashed. However, Anos had sent his companions to intercept the armies and delay them before they clashed, as Misha and Sasha were sent to fight the a band of demons that were trying to link up with the main demon army, while Lay and Misa took care of the advanced forward units of royalists that were advancing, with the Fan Union providing battlefield reports. Meanwhile, Anos and the Demon Elders aligned with him went to flush out Avos and his Demon Elders, as they attacked the base camp of Dilhade's army. The soldiers initially thought that Anos' Demon Elders were there to support them but Anos took advantage of that and launched a suprise attack to quickly overwhelm the army. After defeating them, Avos' Demon Elders revealed themselves and moved to engage Anos and his Demon Elders, as Anos took the chance to slip away in order to confront Avos in the Demon King's Castle. But Avos wasn't present as the castle only contained the Sword of Three Races. After confirming that, Anos received a Leaks communication from Misa as she stated that she lost contact with Lay, with Anos noting that his Gyze link with him was severed. Anos also receives a message from Melheis that they had defeated and captured the other Demon Elders, but the sources controlling them had abandoned them. Anos then realizes the truth about Avos Dilhevia's identity and intentions, as he ordered Melheis to isolate the Sword of Three Races inside of the castle with Azesith. He then teleports to the Azesion side of the border where he encounters Avos Dilhevia. leading the advanced units. Noticing him, Avos attacks him and the two clash, with Anos acknowledging him as both Hero Kanon and Lay. Lay then removes the mask and reveals himself to Anos, asking how he was able to figure out his secret. Anos explain that various clues such as Lay's knowledge of the legend of the one-shell necklace, his ability to wield holy swords, his lack of recall after mastering the Sword of Intent and the sources fused with the Demon Elders allow him to piece together the mystery, as he asked Lay about his motivations for becoming Avos. Lay explains Jerga's plot to destroy Anos and restart the war, as Lay accelerated it because he intended to die in place of Anos. That's why he took command of the demon army as "Avos Dilhevia". He felt like Anos had already sacrificed enough, and it wouldn't be fair to take him away from the peaceful future he made. Giving his explanation, Lay prepared to fight Anos in order to incapacitate him for long enough to fulfil his plan. Meanwhile, Anos prepared to fight Lay to incapacitate him to stop, as he was unwilling to let his friend sacrifice himself to end the war that should have ended ages ago. The two fight fiercely against each other, and though Lay does manage to injure Anos to an extent, the latter manages to destroy six of Lay's seven sources, telling him to stop as he had never beaten him during the Mythical Age. Unwilling to give up, Lay continues to battle by wielding both his holy and demon sword simultaneously. Realizing that Lay wasn't going to stop, Anos lead Lay to a convenient location and allowed him to piece Anos' source with Evansmana. He also swapped their outfits, with Anos wearing the Avos Dilhevia clothes and mask, while garbing Lay in his Hero clothing from the Mythical Age. Anos-as-Avos told him demon followers not to seek revenge against the humans and await his reincarnation. While enraged at their master's death, the demon army moved to retreat in order to fulfil their master's command, as Evansmana. However, they were attacked by a rabid Diego who wanted to continue the conflict until all of the demons were killed and proclaimed that Lay was an demon imposter posing as Kanon, cutting of his adjutant's hand when he objected. The demons were protected by Eleonore who used a barrier to stop the spell, as Diego ordered the Zeshia clones to self-destruct. Before they could self-destruct, they were able to stop themselves. As Diego attempted to manually detonate the Gavuel on them, Lay was able to slice of his hand to stop it. Diego orders his subordinates to attack Lay but they aren't willing to due to acknowledging Lay as the returned Hero Kanon. Lay dared Diego to try to wield Evansmana as the holy sword rejected him and his troops began to depart back to Azesion. Diego then activated Aske, which resurrected Jerga as a demon-destroying spell. Jerga lambastes Kanon/Lay for defending the Demon King and opposing the founding of the Hero Academy, as he even became a demon, telling him that he was disappointed in him. Kanon/Lay returned the sentiment, expressing sadness over seeing his mentor reduced to a spell that embodies hatred as he tried to quickly defeat him but due to the fact that the Jerga spell was holy magic, Evansmana wasn't capable of destroying another holy being as the sword was only effective against dark and demonic beings. Jerga moved to activate the Gavuel magic circles on the Zeshia clones. Misha and Sasha fused together into a new form called Aisha, as she attempted to fight Jerga and stop the Zeshia clones form explode. Lay and the others attempted to prevent the activation by stopping the Zeshia clones but there were too many of them spread out to stop. Just as it seemed that the Zeshia would explode, the activation of Gavuel was stopped by Rivide from a resurrected Anos. Jerga then attacks Anos with a sword made of Aske, as Anos parries the blow and crushes his Aske-formed body with Vebzud but Jerga reforms immediately. Jerga then drains the hope of the humans of Azesion into himself in order to power up and uses it create a armor for his spectral form and a holy sword. He then continues to attack as Anos orders his followers to take the wounded to safety, as Aisha creates a Demon King Castle which is reinforced by Melheis. Misa then uses Fuska to conceal the castle and its entrance as Jerga is shocked to believe that the spirits have sides with the demons, although he later believed that Anos enslaved them to aid him. Lay comes back to assist Anos after regenerating all of his extra sources. The two teamed-up to fight Jerga together. Anos is eventually able to summon his castle Delsgade via a origin spell, as he was able to use Venuzdonoa to destroy the reasoning that prevented Evansmana from harming holy beings like Jerga, as Lay cut off and destroyed his arm. Anos had the Fan Union sing to use Aske to replenish his magic power as he and Lay performed one synchronized attack to destroy Jerga and remove him from the world's order, as Anos granted him one last mercy and reincarnated him so he could meet with his family, who were killed by Anos but also reincarnated by him.

Aftermath
Upon returning to Dilhade, the entire infantry of Demon King Army knelt before their true Demon King and pleaded for his forgiveness for their negligence towards him, Anos forgave his troops and settled with them serving him for the rest of their lives.

Diego is sentenced as a war criminal for cutting off his adjutant's arm when he disagreed with Diego. Despite achieving their goal of killing the Demon King of Tyranny and making the Demon Army retreat, Diego called for the continuation of war until their enemies were annihilated. Due to the appearance of the real Hero Kanon, who, with the Sword of Three Races in hand, protected the people of Azesion from the Demon King of Tyranny, the other reincarnations were deemed fakes. The Hero Academy remains active, but it will no longer have receive vast budget it once did. After the battle confirmed Hero Kanon's return, Azesion requested information from Dilhade in regard to Hero Kanon, as they were unaware of his true identity despite some members of the battalion seeing his face, as his true identity as demon wasn't public knowledge and was only known to the higher-ups of Azesion

Ninety percent of the people who had their hope forcibly drained by Jerga make a full recovery, while the remaining ten percent are in stable condition. His actions are erroneously believed to be the Demon King of Tyranny's, making him a symbol of fear in this age as well. To counter this false belief, Anos and Lay planned to reveal the truth about Avos Dilhevia during the Demon King Reordination Ceremony, while conducting a story on how Hero Kanon and the true Demon King fought together to defeat the fake Demon King.