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|quote = ''''' I am the Arch-fiend, the Despoiler of Worlds, and by my hands shall the false Emperor fall.'''''{{Fn|6}}

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[[Image:AbaddonArtVigilusAlone.jpg|thumb|300px|right|Abaddon, Warmaster of Chaos{{Fn|6}}]]

'''Ezekyle Abaddon''', more commonly known as '''Abaddon the Despoiler''', is the [[Warmaster]] of [[Chaos]], the former [[First Captain]] of the [[Sons of Horus]] [[Space Marine Legion|Legion]] and now absolute [[Legion Master|Master]] of the [[Black Legion]], and rumoured to be the clone-progeny of Warmaster [[Horus]]{{Fn|23a}}. He is the most powerful Warmaster of all, successor to Horus, and blessed by all four of the [[Gods of Chaos]]. Despite being the Warmaster of Chaos, Abaddon has refused giving himself fully over to the Ruinous Powers as the [[Daemon Primarch]]s have, as this would limit his existence beyond the [[Eye of Terror]] and push his ultimate vengeance against the [[Imperium]] beyond his grasp.{{Fn|8a}}

[[Image:AbaddonHH1.jpg|thumb|160px|right|Abaddon at the time of the [[Great Crusade]] ]]

During the [[Great Crusade]], Ezekyle Abaddon rose to the prestigious post of [[First Captain]].{{Fn|1a}} He loved and worshiped Horus as a father, and it was rumoured that Abaddon was one of the few "Sons of Horus," those [[Space Marines]] who were created directly from Horus's [[geneseed]].{{Fn|1a}} Extremely proud and quick to anger, Abaddon's martial record was unsurpassed by that of any other Luna Wolf.{{Fn|3c}} Bellicose by temperament, Abaddon was usually the most hawkish of the Warmaster's advisors. During the final years of the Crusade, Abaddon disagreed, sometimes violently, with Horus's decision to parley with the [[Interex]], a human civilization that allowed an [[alien]] species to co-exist with them.{{Fn|3d}}

In addition to his position as First Captain, Abaddon was also one of the four members of the [[Mournival]], a special advisory council to the Warmaster, since its inception. He took his position extremely seriously, but did enjoy sharing his sense of humour with his Mournival brothers.{{Fn|3b}} Abaddon eventually grew frustrated and angry at the Emperor's supposed abandonment of the [[Space Marine Legion]]s, feelings which swelled to the surface when Horus lay near to death on [[Davin]]. A member of the [[warrior-lodge]] within the [[Sons of Horus]], he went along with [[Erebus]]'s plan to take the Warmaster to the [[Serpent Lodge]] for healing, beginning Abaddon's road to damnation.{{Fn|4}}

[[Image:AbaddonvsLokken.jpg|thumb|right|200px|Abaddon battles [[Garviel Loken]] during the [[Battle of Isstvan III]] ]]

After Horus's recovery, Abaddon grew ever more protective of his [[Primarch]] and his Legion's reputation, to the point where he saw [[remembrancer]] criticism and Imperial investigation into Legion activities as threats and insults that could not be borne. He therefore sanctioned the murder of [[Ignace Karkasy]] and the blaming of Legion-caused civilian casualties upon [[Garviel Loken]].{{Fn|4}} This course of action was frustrated by the refusal of [[Tarik Torgaddon]] to accede to the plan, and the Mournival brotherhood was effectively broken as a result.{{Cite This}}

Abaddon was present at several of the major actions of the [[Horus Heresy]]. During the purging of the loyalist Legionaries at [[Isstvan III]], Abaddon notably took to the field to attend the final meeting of what had once been the Mournival, at which he dueled with Garviel Loken. Though slightly wounded in the combat, Abaddon emerged the victor.{{Fn|5}} Abaddon again dueled Loken on the [[Vengeful Spirit]] in the aftermath of the [[Battle of Molech]] after the [[Knights-Errant]] attempted to assassinate Horus.{{Fn|10}} During the [[Battle of Trisolian]] Abaddon relished the massacre of his former comrade [[Bror Tyrfingr]] and expressed shock when Horus, cleansed of some corruption by the [[Spear of Russ]], expressed regret for how much blood had been spilled in his war.{{Fn|13}} Subsequently, Abaddon was charged with hunting down and finish off the Wolves at the [[Battle of Yarant]]. However the Wolves ultimately escaped thanks to the aid of [[Corax]], and Abaddon returned to Horus' side during the muster at [[Ullanor]].{{Fn|14}} During the subsequent [[Solar War]], Abaddon was given the important duty of capturing [[Luna]] from loyalist forces. Commanding a fleet of Sons of Horus, Word Bearers under [[Zardu Layak]], and Thousand Sons under [[Ahzek Ahriman]], Abaddon's forces initially clashed with the [[White Scars]] fleet under [[Jubal Khan (Heresy)|Jubal Khan]]. During the boarding of the White Scars [[Battleship]] ''[[Lance of Heaven]]'' alongside Layak, Abaddon dueled and slew Jubal. He next directed the [[Battle Barge]] ''[[War Oath]]'' in a kamikaze attack on the defensive ring around Luna, devastating the loyalist defenses as he teleported onto the moons surface with his Justaerin elite. During the fighting inside Luna's gene-labs, he convinced the [[Selenar]] [[Matriarch (Selenar)|Matriarch]] [[Heliosa-78]] to join Horus instead of following through with [[Rogal Dorn]]'s orders to destroy her precious gene-tech in order to prevent it from falling into traitor hands.{{Fn|16b}}

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|quote = ''''' Horus was weak. Horus was a fool. He had the whole galaxy within his grasp and he let it slip away.'''''{{Fn|28a}}

By the time Abaddon finally reached his father, the Primarch had already been struck down by the Emperor. Discovering [[Garviel Loken]] watching over Horus' corpse, Abaddon allowed his former brother to live, believing too much blood had been spilt already. Loken stated that if Abaddon surrendered now, he would see to it that Dorn spared the lives of the remaining Sons of Horus. Abaddon rejected this notion and stated their cause of rebellion to still be just; however, he appeared to at least consider Loken's arguments to fully reject Chaos. Before Abaddon could embrace this idea, Erebus appeared behind Loken and stabbed him through the back. Abaddon expressed horror and fury at Loken's sudden murder, but Erebus explained that his death was a necessary event to create the Daemon [[Samus]] in the first place.{{Fn|27b}} Erebus convinced Abaddon that he could learn to control the Warp better than his father, who had been rendered a slave to darkness. Thus, Abaddon let Erebus live as the latter was still potentially useful. Afterward, he reestablished command over the ''Vengeful Spirit'' which had been cut from the Warp due to Horus' demise. He then observed the retreat of the Sons of Horus from Terra before ordering a retreat from the [[Sol System]].{{Fn|27c}} The traitors eventually fled into the [[Eye of Terror]].{{Fn|1a}}

[[Image:AbaddonTOH.jpg|thumb|right|200px|Abaddon after the fall of [[Maleum]] ]]

Shortly after the Heresy, Abaddon abandoned the Legion; broken by the death of Horus and sick of war, he wandered alone into the Eye of Terror.{{Fn|8a}} Meanwhile, within the Eye itself, [[Legion War|civil war]] soon broke out amongst the traitor Legions. Becoming embroiled in a war against the [[Emperor's Children]], the Sons of Horus's fortress of Lupercalios on [[Maeleum]] was destroyed and the Emperor's Children stole the corpse of Warmaster Horus himself. Eventually with the help of [[Fabius Bile]], a number of clones of Horus were created, an act which disgusted the Sons of Horus. With the Sons of Horus in a desperate situation, warband leaders [[Falkus Kibre]], [[Iskandar Khayon]], and [[Lheorvine Ukris]] decided to seek out the [[Vengeful Spirit]] and Abaddon with it. With the help of the [[Word Bearers]] [[Sargon]], they eventually found the ''Vengeful Spirit'' buried on the former [[Eldar]] world of Aas'ciaral in the Eleusinian Veil deep within the [[Eye of Terror]]. Inside they found Abaddon, who revealed he had dispatched Sargon to bring them to him. Abaddon had become reinvigorated at the news of the cloning of Horus, and was assembling forces to end the abomination.{{Fn|6}}

====Vigilus====

[[Image:AbaddonArtNew.jpg|thumb|right|250px|Abaddon on [[Vigilus]] ]]

Abaddon later reemerged at the head of a massive [[Chaos]] armada to invade [[Vigilus]]. His objective was to destroy the planet's [[Blackstone]] deposits and permanently seal the [[Nachmund Gauntlet]], dooming the [[Imperium Nihilus]]. After acquiring the ancient weapon known as the [[Voidclaw]] to decimate much of Vigilus' surface, Abaddon's victory seemed certain. However, he was goaded by Imperial Commander [[Marneus Calgar]] into a duel. Though he bested Calgar in the battle and nearly slew him, the [[Ultramarines]] [[Chapter Master]] had used the distraction to cripple the ''[[Vengeful Spirit]]'' with an allied [[Eldar]] vessel loaded with [[Deathstrike Missile]]s. Faced with slaying Calgar or saving his prized flagship, Abaddon teleported away from Vigilus and left the warzone when the ''Vengeful Spirit'' made an emergency transition into the Warp.{{Fn|15}} Abaddon was able to rapidly locate the ''Vengeful Spirit'' and launched a boarding operation to reclaim it. Onboard he found hundreds of his own Chaos Space Marines who had lost contact with their Warmaster battling for supremacy. Abaddon then swept across the vessel, restoring order and slaying any who opposed his will. He then took his seat in Lupercal's Court and planned his next move.{{Fn|20}}

====Arks of Omen====

Months later, as Abaddon oversaw continued repairs to the ''Vengeful Spirit'', he was contacted by the [[Daemon]] [[Vashtorr]] and entered into an alliance with the creature after learning of an ancient [[Old Ones]] device known as [[The Weapon]]. Together, the two constructed great [[Space Hulk]] weapons known as [[Ark of Omen|Arks of Omen]], beginning a [[Ark of Omen Campaign|new war]] across the galaxy in an effort to find the [[Key-Fragment]]s to the weapon.{{Fn|22}}

At the conclusion of the campaign aboard ''Vengeful Spirit'', Abaddon directly led the Black Legion against [[Dark Angels]] and [[Unforgiven]] forces during the [[Battle of Idolatros]]. Though Imperial forces emerged largely militarily victorious and the [[Primarch]] [[Lion El'Jonson]] returned, Vashtorr succeeded in completing The Key and now sought for [[The Lock]], the vault which held The Weapon.{{Fn|25a}}{{Fn|25b}}

[[Image:AbaddonArt13th.jpg|thumb|right|150px|Abaddon the Despoiler{{Fn|21}}]]

Imposing in almost every way, Abaddon possessed a particularly deep voice, was taller, stronger and bulkier than the average Space Marine, and wore his long black hair in a strikingly tall topknot when not using a helmet. He had similar facial features to those of Horus, particularly the widely spaced eyes and long, straight nose. He often wore a large black wolf-pelt over his [[Power Armour]], to which he also attached a cloak upon occasion. Abaddon possessed both a suit of power armour and suit of [[Terminator Armour]], the former being painted in the standard colours of his Legion, while the latter was primarily black in colouration. This marked him out as a member of the 1st Company elite, all of whom wore black armour.{{Fn|3a}}