View source for Alpha Legion

{{redirect|Ghost Legion|the novel by [[Mike Brooks]]|Ghost Legion (Novel)}}
{{QuoteBox|quote = ''"Our name is Legion, for we are many."''
|source = [[Wikipedia:Gospel of Mark|The Book of Malignancies]], [[The Apocrypha Terra]], Origin date unknown{{Fn|23a}}}}
{{Traitor Founding Legions
|Pre-Heresy Banner=ALSymbolPreHeresy.jpg
|Current Banner=Alphalegion.png
|Marine Image=ALMarine.jpg
|Miniature=Alphalegionnaire2019.jpg
|Name=Alpha Legion{{Fn|1a}}
|Legion Number=XX{{Fn|1a}}
|Primarch=[[Alpharius]] and [[Omegon]] (twins){{Fn|2h}}
|Homeworld Pre-Heresy=No record{{Fn|1a}}
|Homeworld Current=They have no known central base of operations, but are known to have set up secret positions within Imperial space{{Fn|1e}}
|Chaos God=Diverse, ranging from secretly loyalist{{Fn|33b}} to none{{Fn|61c}} to [[Chaos Undivided]];{{Fn|3}}{{Fn|61c}} most make use of [[Daemon]]s{{Fn|1f}} and [[Chaos Sorcerer]]s{{Fn|61c}}
|Colours=
'''Pre-Heresy:'''<br>Blue {{Color sample|#0066CC|size=15}} & Silver {{Color sample|Silver|Azure|size=15}}<br>
'''Post Heresy:'''<br>Green {{Color sample|DarkGreen|size=15}} / Blue {{Color sample|#0066CC|size=15}} & Silver {{Color sample|Silver|Azure|size=15}}{{Fn|1c}}
|Specialty=Infiltration & Covert Operations, [[Chaos Cult|Cultists]]{{Fn|1f}} and [[Operative]]s{{Fn|2c}}
|Battle Cry=''Hydra Dominatus''{{Fn|1c}}
|Warbands=
*[[20th Alpharians]]{{Fn|60a}}
*[[Armoured Serpents]],{{Fn|60a}}
*[[Daggerfangs]],{{Fn|57a}} [[Darganti Revenants]]{{Fn|40a}}
*[[Eight Stolen Truths]]{{Fn|40a}}
*[[Faceless (Warband)|The Faceless]],{{Fn|76}} [[The Faithless]],{{Fn|5b}} [[First Strike (Warband)|First Strike]]{{Fn|76c}}
*[[Guns of Freedom]]{{Fn|76c}}
*[[Harrok's Teeth]]{{Fn|90}}
*[[Honourless]]{{Fn|63}}
*[[Ironhydras]]{{Fn|71}}
*[[Penitent Sons]]{{Fn|76c}}
*[[The Redacted]],{{Fn|33a}} The [[Rustbloods]]{{Fn|76}}
*[[Scaled Fang]],{{Fn|71}} [[Serpentine Scourge]],{{Fn|40a}} The [[Serpent's Teeth]],{{Fn|76c}} [[The Shadowed Ones]],{{Fn|27b}} [[Shrouded Hand]],{{Fn|40b}} [[Sons of Deception]],{{Fn|60a}} [[Sons of the Hydra]],{{Fn|33b}} [[Sons of Venom]],{{Fn|76c}} [[Soulfangs]], [[Splintered Sentients]],{{Fn|40a}} [[Subtle Blades]]{{Fn|65}}
*[[Third Harrow]]{{Fn|40a}}
*[[Voldorius]]' Warband{{Fn|39}}
*The [[Unsung]]{{Fn|61b}}
*[[Whispering Forge]]{{Fn|40a}}
}}
The '''Alpha Legion''', also known as the '''Ghost Legion''' during the early [[Great Crusade]],{{Fn|35}} is the '''XX Legion''' of the original twenty [[Space Marine Legion]]s. They turned against the [[Emperor]] during the [[Horus Heresy]], becoming [[Chaos Space Marines]].{{Fn|1d}} Even before they turned to [[Chaos]], the Alpha Legion were renowned as the most secretive of all the Legions.{{Fn|1a}} The Alpha Legion's most closely guarded secret, unbeknownst to all but a few outside the Legion, is that they had two [[primarchs]]; [[Alpharius]] and his twin [[Omegon]] (sometimes referred to collectively as just 'Alpharius Omegon').{{Fn|2h}}

The Alpha Legion's veterans are experts in infiltration, sabatoguge and discord, covert operations, and manipulating events in their favour without revealing themselves or engaging in open warfare. Alpha Legionaries have been known to disguise themselves as loyalist [[Space Marines]].{{Fn|12}} Their armies also contain regular [[human]]s known as [[operative]]s.{{Fn|1a}}