i copied it from this wikia Prince Arthas Menethil was born to King Terenas Menethil II and Queen Lianne Menethil, four years before the start of the First War.[1] The young prince grew up in a time when the lands of Azeroth were ravaged by war, the Alliance was crumbling, and darker clouds still loomed on the horizon. As a young child, he became best-friends with Varian Wrynn and often sparred with him though Arthas was less experienced. He also watched as his future steed, Invincible, grow up. As a youth, Arthas was trained in combat by Muradin Bronzebeard, the brother of the dwarven king Magni Bronzebeard, and became an adept swordsman, while at the same time learned the ways of the Light under the tutelage of Uther the Lightbringer. He also developed a love interest with Jaina Proudmoore when she was staying in Lordaeron on her way to Dalaran where she would be studying, which Arthas offered to escort her to. Some time later, Terenas had arranged a political wedding for Arthas' sister Calia with lord Daval Prestor. Calia was distraught by the decision and when Arthas tried to calm her, she wished that Arthas would chose his wife and the future queen of Lordaeron out of love, rather than politics. Arthas was inducted into the Knights of the Silver Hand at the young age of 19. The ceremony was held in the Cathedral of Light in Stormwind City, and was attended by many prominent figures such as Genn Greymane, Thoras Trollbane, Daelin Proudmoore and his daughter Jaina, whom Arthas had not seen since childhood. Archbishop Alonsus Faol led the initiation process before four of the five original paladins: Uther, Tirion Fordring, Saidan Dathrohan, and Gavinrad the Dire (Turalyon had been lost on the Alliance Expedition), during which Arthas was presented the holy warhammer called Light's Vengeance by Gavinrad and had the ceremonial silver plates placed upon his shoulders by Uther. While in Stormwind, Arthas visited the newly crowned King of Stormwind Varian Wrynn and sparred with him while recounting old memories, as well as the recently-born Anduin Wrynn who gripped his finger. Arthas once visited Durnholde Keep where he saw the famous orc gladiator Thrall. He stayed in the Keep during the night and Aedelas sent Taretha to Arthas' chamber to please him. However, Arthas had only a talk with her and he noticed that Taretha remind him of Jaina Proudmoore whom he had begun to fall in love with. Later on, he rode on Invincible only to have an accident which caused Invincible to be dealt a mortal wound. Arthas had no other option than to kill his beloved steed in order to stop its suffering, an act which would haunt him for the rest of his life. Arthas met the only daughter of Admiral Proudmoore, the sorceress Jaina during his youth. Their relationship grew close as friends first, and then romantically years later. They were very much in love with one another. Arthas once stayed in Dalaran only to be with Jaina. During his visit, Antonidas organized a banquet for Arthas and Kael'thas who also happened to be there at the same time as Arthas. At the banquet, Arthas and Antonidas spoke of the situation regarding the orcs strange lethargy, Terenas' health, as well as about Stormwind, the young Anduin Wrynn and Arthas' relationship status. Kael'thas whom was also fond of Jaina, once caught Arthas and Jaina together under an arch as they were kissing which angered him out of jealousy. Arthas paid the jealous elf prince no mind. Having grown into a strong, confident young man, Arthas was headstrong and somewhat arrogant, though none could dispute his bravery and tenacity. Arthas came to be considered one of the finest swordsmen in Lordaeron and was famed for counterattacking and defeating the forest troll warbands of Zul'Aman when they began raiding the settlements along the Quel'Thalassian border.[2] Later on, Arthas invited Jaina to Lordaeron to celebrate the two festivals of Noblegarden and Hallow's End, during this time Arthas revealed that he is courting Jaina to the public. Eventually, however, Arthas began to question whether the two of them were ready to be together. Arthas abruptly ended the relationship so Jaina could focus on her magical studies in Dalaran and Arthas could focus on his commitments to Lordaeron. Shortly after, they would agree to rekindle their romance, but this was during the beginning of the Scourge invasion, an event that would change both of their lives forever. He held the position as one of the four jurors during The Court of Tirion Fordring in Stratholme. Begining of the campaign Troubles began to stir in Lordaeron. Orcs broke free of their internment camps, and there was distressing news of a plague that had gripped the northlands. Arthas and Uther were sent to Strahnbrad to defend the town from orcish raids. The young prince defeated the black drake Searinox to retrieve its heart for the dwarf Feranor Steeltoe to forge into an orb of fire. Arthas used this magical item to help defeat the orcs and kill the Blackrock Clan's blademaster leading the raids. However, weeks later a more vile threat arose in the form of the plague of undeath. Jaina and Captain Falric were sent to join Arthas, now 24 years old, in order to investigate the strange plague. They fought an undead army at a plague-infested granary. They encountered the necromancer Kel'Thuzad in the town of Brill and pursued him to Andorhal. Kel'Thuzad had already infected the stored grain in Andorhal and shipped it out to outlying villages. Before Arthas killed him, Kel'Thuzad spoke of Mal'Ganis, a Nathrezim demon who led the Scourge. Jaina and Arthas traveled north to confront him in Stratholme. Along the way, Arthas and Jaina stopped at Hearthglen Village where they hoped to rest. Instead, they were warned of an approaching army of undead. Arthas ordered Jaina to find Uther and seek his aid while he remained behind to defend the town. To his horror, Arthas discovered that the plague was not merely a means of mass murder, but rather, the means of turning innocent townsfolk into undead creatures. Arthas's forces barely held out and were on the verge of defeat when Uther arrived with reinforcements and saved the village. While traveling to Stratholme, Arthas was met by the enigmatic prophet Medivh. He gave him the same advice he gave Terenas — to travel west to Kalimdor. Arthas argued that his place was with his people, and vowed that he would not abandon them. Jaina suggested that the prophet might be right, but Arthas paid her no heed and continued to Stratholme. When he arrived, Arthas found that the grain had already been distributed, and knew that the villagers would soon become minions of the scourge. He ordered Uther and his knights to purge the entire city. Horrified, Uther rebuked him by saying that he would not follow such an order even if Arthas were already king. Proclaiming that Uther had committed treason, Arthas disbanded the Knights of the Silver Hand. Several of his soldiers left with Uther — as did Jaina — while those that remained loyal to Arthas joined him in slaughtering the corrupted townsfolk. As Arthas began to slay the citizens of Stratholme, he was met by Mal'Ganis himself, who was working to claim the souls of the townsfolk. Arthas worked to destroy them before Mal'Ganis could reach them. Finally, Arthas demanded a final showdown with the dreadlord. Mal'Ganis slipped away, however, vowing to meet him in Northrend. Arthas then set fire to Stratholme. Something snapped in Arthas that day, his inability to stop the plague sent him down the cold lonely road he would soon follow. The fires burn to this day. Arthas followed Mal'Ganis with a detachment of his troops. They arrived a month later in Daggercap Bay. As they searched for a proper place to set up camp, Arthas's men came under gunfire before being recognized by the dwarven explorers guild. Arthas was shocked to have come upon his good friend and former mentor, Muradin Bronzebeard. At first, Muradin thought that Arthas was leading a rescue party sent to save his men, who had been besieged by the undead as they searched for the runeblade Frostmourne. Arthas admitted it was mere coincidence. Together they destroyed the nearby undead camp, but there was still no sign of Mal'Ganis. As Muradin and Arthas continued their search for Frostmourne, an emissary from Lordaeron arrived in a zeppelin and spoke to Captain Luc Valonforth. He bore orders from Uther and Terenas, instructing Arthas and his men to return home. When Arthas returned to his base, the men had abandoned their posts, and were making their way through the forest towards their boats. Arthas had no intention of leaving before Mal'Ganis was destroyed. With the help of some indigenous mercenaries, he managed to reach and burn his boats before his men got to them. When his men arrived, Arthas betrayed his mercenaries, accusing them of destroying the ships, and the Captain had them killed, much to the disgust of Muradin. Arthas told his men that they had no means of going home, and the only way they were leaving Northrend was through victory. Arthas and his troops continued to press on to Drak'Tharon Keep in search of Frostmourne. As he arrived, Mal'Ganis appeared to him, and foretold his death. Arthas went to search for Frostmourne with Muradin, leaving his captain to defend the camp. Using an ancient waygate, Arthas, Muradin, and a small group of men traveled to the vicinity of the fabled runeblade. Arthas was soon confronted by the Guardian, who tried to keep him from Frostmourne, apparently for his own protection. The Guardian fell, and Arthas and Muradin went forward to their prize. Muradin, reading an inscription, reported that the blade was cursed and pleaded "Oh, leave it be, Arthas! Forget this business and lead your men home!", but Arthas was adamant. Arthas asked the spirits of the cavern for the sword to be released from its icy prison, proclaiming that he would "give anything or pay any price, if only you will let me save my people." When the weapon broke free, Muradin was struck by a rogue shard of ice. Arthas moved to help Muradin, but was dissuaded by the call of Frostmourne in his mind. Arthas discarded his holy warhammer, Light's Vengeance, then picked Frostmourne up and returned to his base, leaving Muradin for dead. With Frostmourne in hand, Arthas defeated Mal'Ganis' army, destroyed his base, and finally confronted the demon. Mal'Ganis told him that the voice he was now hearing was that of the Lich King. However, Arthas replied that voice was instructing him to destroy Mal'Ganis, much to the dreadlord's surprise. Slaying the dreadlord, Arthas fled into the frozen north, leaving his troops to fend for themselves. Arthas soon lost the last remnants of sanity. Arthas returned to Lordaeron months later, and the kingdom rejoiced at the return of its champion. Flanked by Falric and Marwyn, Arthas entered the Imperial chamber and knelt before the throne. Heeding the voice of Frostmourne that he no longer needed to bear the weight of his crown, Arthas walked up to Terenas and ran the blade through his father's heart.[1] The king's bloodied, broken crown remains lost to this day. As he drew Frostmourne, Arthas remembered the words of his old friend Varian describing his own father and king Llane being stabbed in the heart. Arthas fled the scene and traveled to the Balnir Farmstead. There he used his necromantic powers to raise his faithful steed Invincible into undeath, allowing it to serve as his mount once again. Weeks later, Arthas reappeared in Vandermar village at the bidding of his new master, the Lich King. There he met Tichondrius the Darkener, a dreadlord like Mal'Ganis. Thinking that the dreadlord was Mal'Ganis out for revenge, Arthas immediately threatened him, only to discover that this Dreadlord had come to congratulate Arthas for his efforts. When spoken to Arthas said he no longer felt remorse for any of his actions, though deep in his heart he knew this was a lie.[2] Tichondrius explained that the sword was designed to steal souls, and that Arthas's own soul was the first one it had claimed. Arthas assembled the members of the vile Cult of the Damned that were hiding in Vandermar, and was aided by their magical abilities as he traveled to Andorhal where he was to recover Kel'Thuzad's corpse. He confronted the paladin guarding the crypt, Gavinrad the Dire, who had given Arthas his holy warhammer at his induction ceremony into the Silver Hand. After killing Gavinrad, he recovered the remains of the necromancer. This brought Kel'Thuzad's ghost into being, and he secretly instructed Arthas not to trust the dreadlords. Arthas quietly contemplated this. Kel'Thuzad's remains were badly decomposed and needed to be taken to the mystical Sunwell in Quel'Thalas to be revived. Tichondrius sent Arthas to recover a mystical urn, which could be used to transport Kel'Thuzad's remains. However, the urn was in the keeping of the Knights of the Silver Hand. Arthas killed two paladins, Ballador the Bright (who survived) and Sage Truthbearer, who both condemned Arthas's betrayal. He then faced Uther the Lightbringer, who explained that the urn held the ashes of his father, King Terenas. The two engaged in a duel with Uther initially having the upper hand, knocking Arthas down and sending Frostmourne flying from his hands. As Arthas awaited the killing blow, the sword seemed to find its own way into his hands and he was granted more power by the Lich King. The battle had began to turn in Arthas's favor and Uther, covered in blood from his wounds, fell to his knees telling Arthas he hoped there was a special place in hell waiting for him. Arthas replied he intended to live forever before delivering the killing blow. He seized the urn and abandoning his father's remains, which swarmed on him with the wind and caused him to choke and burned his eyes. Arthas then replaced them with those of Kel'Thuzad, then began the long journey to Quel'Thalas Arthas met heavy resistance from the elves, rallied by Ranger-General Sylvanas Windrunner. Driving their forces before his undead army, he steadily pushed her people back in a swath of destruction towards Silvermoon. Sylvanas tried to warn the vast elven capital of the coming of the Scourge, but Arthas destroyed her camps and killed the Ranger-General. To make her pay for her perceived insolence towards him, Arthas corrupted her elven spirit, transforming it into a horrendous twisted form (a banshee) and enslaving her to the will of the Lich King, forcing her to slay her own people. Arthas, along with the marching armies of the Scourge annihilated Silvermoon, leaving it in ruins. On the road to the Sunwell, he faced Anasterian Sunstrider, the aged High King of Quel'Thalas, and killed him with minimal struggle. Arthas then used the Sunwell to bring Kel'Thuzad back to life, reborn as an undead lich. As the pair travelled to Alterac, Kel'Thuzad explained the full extent of the "Second Invasion" and the plans of the Lich King and the Scourge.[4] Arthas and Kel'Thuzad went to the Alterac Mountains to destroy encampments of Blackrock Clan orcs who had taken control of a demon gate, which the lich would use to speak to the demon lord Archimonde. The Scourge destroyed the orcs, and after Kel'Thuzad received orders from Archimonde, they set out for the powerful seat of the world's mages, the city of Dalaran. Archimonde instructed them to acquire the spellbook of Medivh, which would allow Kel'Thuzad to summon Archimonde into Azeroth.[5] Despite the Kirin Tor's valiant efforts to repel the invasion, the Scourge fought through their magical defenses and fortifications, killed the Archmage Antonidas and claimed the Book of Medivh. Arthas and his troops repelled the mages' vast counterattack as Kel'Thuzad began the lengthy summoning of the demon lord. Once Archimonde arrived, he proclaimed that the Lich King was of no further use to the Legion, and Tichondrius was placed in command of the Scourge. Arthas was left to wonder what would become of him and Kel'Thuzad, but the lich replied that all was going as the Lich King foresaw. The pair disappeared as Archimonde took his revenge on the city, destroying Dalaran with a single powerful ritual. Arthas was next seen several months later in Kalimdor, where Tichondrius was employing the fel power of the Skull of Gul'dan. Arthas told the recently freed demon hunter Illidan how to claim the skull's powers as his own, whereupon he could destroy Tichondrius. Illidan agreed to his plan, and Arthas disappeared again. Archimonde left a trio of dreadlords behind in the ruined palace gardens of Lordaeron to ensure that the nation remained under control, and to watch over the cunning servitors of Ner'zhul. When the demon lord was defeated, however, they were not originally aware of it. This changed several months later, when Arthas returned to reclaim his throne. He threatened the dreadlords, who immediately fled, and then called Sylvanas and Kel'Thuzad to his side. Together they crushed the remaining human refugees in the area, who were led by the paladins Halahk the Lifebringer, Magroth the Defender, and Dagren the Orcslayer. However, during the climax of the battle, Arthas had a painful seizure, and felt the Lich King calling out to him. Despite his diminished powers, Arthas fought on until all the remaining humans were killed.[6] Little did Arthas know that the Lich King's power had dwindled to the point that Sylvanas was no longer under his control. In secret, she attended a meeting with the three dreadlords, who told her that the Lich King's power was waning, and so the time had come to claim her vengeance. Arthas was ambushed in the capital city, and was forced to collect what loyalists he could find and fight his way through the dreadlords' forces, which included the powerful abomination Bloodfeast. As he arrived on the city's limits, he was saved by a cadre of banshees, who told him that Sylvanas had sent them to see him safely away. However, as they neared an empty spot in the forest, Arthas received another vision from the Lich King, who told him he'd been betrayed. Sylvanas then appeared and shot him with a paralyzing arrow. Kel'Thuzad stepped in and chased her off at the last moment. But the Lich King's mental cries pierced Arthas's mind - he was told to return to Northrend, for demonic forces (later revealed to be Illidan and the naga) were working to destroy the Frozen Throne and end the self-proclaimed king's reign. Immediately, Arthas prepared his fleet and set sail for Northrend, leaving Kel'Thuzad behind to watch over Lordaeron. Three weeks later, Arthas landed upon the familiar coast of Northrend, and unexpectedly found himself being attacked by blood elves led by Kael'thas, hungry for vengeance at their kingdom's destruction. Arthas was unexpectedly saved by a large Crypt lord who introduced himself as Anub'arak, the former king of Azjol-Nerub. Kael'thas warned that though the preliminary scouting force may have fallen, their main army would not be so easily defeated, before teleporting away to safety. Arthas worried that he may be right, and that they would never reach Icecrown Citadel before Illidan, but Anub'arak thought differently. He suggested that they delve into the shattered kingdom of Azjol-Nerub, using the underground passageways to beat Illidan to the Glacier. Seeing little other choice, Arthas agreed. Anub'arak suggested raiding the hoard of Sapphiron, an ancient blue dragon and servant of Malygos, and equipping themselves with the dragon's treasures. Not only did they slay the dragon, but Arthas used what power he had left to raise Sapphiron into a powerful frost wyrm. When he came to the doors of Azjol-Nerub, Arthas found himself being fired upon by dwarves, who revealed themselves to be followers of Muradin who had remained there when their leader appeared to die. Now, they were led by Muradin's second in command, Baelgun Flamebeard. Leaving Sapphiron outside, Arthas battled through not only Baelgun's dwarves, but also the nerubian survivors, as he delved into the broken Spider Kingdom. Anub'arak's aid was invaluable, as he circumvented many traps which would have cut Arthas' stay fatally short. As Arthas faced Baelgun, the dwarf warned that the shifting earth had released an ancient evil from below the kingdom. As Arthas and Anub'arak delved deeper into the kingdom, that evil became apparent - the Faceless Ones, a powerful, vicious race thought only to exist in legend. Arthas and Anub'arak even managed to defeat the incredibly powerful Forgotten one. As they made their way to the Upper Kingdom, an earthquake collapsed part of the passage they were in, separating Anub'arak from Arthas. The young king had to rely upon his wits to see himself through several daunting booby traps before Anub'arak dug his way to Arthas. Once reunited the Crypt lord complimented the young Death Knight, saying he now understood why Ner'zhul had chosen him as his champion. As they climbed out of Azjol-Nerub, the Lich King contacted Arthas once again, and explained that he was losing his power, because the Frozen Throne had been cracked, and energy was seeping from it. Ner'zhul replenished Arthas's powers, knowing he would need them in the coming battle. When they finally reached the surface, they immediately had to contend with Illidan's forces. Vashj's naga and Kael's blood elves were there to contest Arthas's minions at every turn. Arthas, with Anub'arak's help, battled his way through their forces and magically activated the four Icecrown Obelisks around the glacier, opening the doors to the Frozen Throne. However, Illidan was waiting for him. Arthas warned Illidan to leave Azeroth and never return. Refusal from Illidan initiated a short but intense duel, with Illidan Inadvertently leaving himself open. Arthas pressed the advantage, slicing open the demon hunter's chest with Frostmourne. Illidan collapsed in the snow, as Arthas turned towards the gates of icecrown triumphant. Arthas entered the hollow glacier and beheld a winding pinnacle chained to the ice. As he strode up the stairs towards his destiny, the voices of those he had forsaken flooded through his mind. He heard Muradin Bronzebeard, Uther, and Jaina calling out to him, yet he ignored them, continuing his ascent. Finally, he reached the pinnacle and before him he saw an icy cask. Inside was a suit of armour, arranged as if seated on a massive throne. Now only one voice spoke to him - the rasping whisper of Ner’zhul: "Return the blade...complete the circle...release me from this prison!" With a great cry of strength, Arthas brought Frostmourne to bear against the Lich King's icy prison and with a haunting scream, the Frozen Throne exploded, and shards of the crystal scattered on the ground. With Ner’zhul’s thorny helm at his feet, Arthas leaned forward, picked it up, and placed the unimaginably powerful artifact on his head. "Now," Ner'zhul's voice echoed within his mind, "we are one!" In that moment, Ner'zhul and Arthas's spirits fused into a single mighty being, just as the Lich King had always planned. Arthas as a single being ceased to exist, now one half of one of the most powerful entities Azeroth had ever known, the new Lich King. While he dreamed, Arthas banished his humanity and suppressed Ner'zhul's spirit, allowing him to become the dominant personality of the Lich King.[10]. As the Lich King, Arthas instigated another Scourge invasion of Azeroth, provoking a counteroffensive in Northrend by the Horde, Alliance, Argent Crusade, and Knights of the Ebon Blade. In doing so, he lured powerful heroes to Northrend and placed many challenges before them, seeking to weed out the weak and make the strong question their own morality. He planned to raise the world's greatest fighters as his new champions, and use them to spearhead attacks on their homelands, in a reflection of his own journey.[11][12] His plan nearly succeeded when a group of adventurers led by Tirion Fordring finally ascended to the Frozen Throne and did battle with him after Horde, Alliance and Ashen Verdict forces assaulted Icecrown Citadel. The Lich King froze Tirion in a block of ice, and in the middle of the battle, he suddenly killed the adventurers in a single mighty blow. Ultimately, the Lich King's plans were foiled when just as he was about to raise the would-be heroes into undeath, Tirion called upon the Light and freed himself from the ice, shattering Frostmourne with the Ashbringer, releasing all of the souls inside including Arthas's soul. The Lich King was severely weakened, and Terenas resurrected the adventurers who defeated him alongside Tirion. After striking a mortal blow against the Lich King, the Helm of Domination was knocked off of Arthas's head as he reached for it in desperation before collapsing on the ground. As he lay dying, the spirit of his father appeared before him as the glow brought on by his fusion with Ner'zhul faded from his eyes. With his soul freed and his connection with the Lich King severed, Arthas was returned to his former self, albeit in his dying moments. Arthas asked his father if it was over, to which Terenas placed a comforting hand over Arthas's and replied "At long last. No king rules forever, my son." Arthas said that he saw only darkness before him, with his eyes rolling back and his hand falling lifelessly to the ground - ending the life of Arthas Menethil once and for all.
So... Basically Darth Vader story? The hero who becomes the Villain. But redeemed at his final moments.