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The Emperor's angels
Space Marines
Mortal human conscripts who fight for the Imperium; highly expendable
Imperial Guard
The all-female military arm of the Ecclesiarchy
Sisters of battle
The tech-priests of the Imperium; make everyone's weapons and view the Emperor as the Omnissiah, or "Machine God.''
Adeptus Mechanicus
Imperial Households; their nobles pilot giant mechs
Imperial Knights
The incredibly powerful personal guard of the Emperor; wear golden armor
Adeptus Custodes
Traitor Households, piloting gargantuan mechs twisted into monsters by the ruinous powers
Chaos Knights
Corrupted angels of the Emperor, now servants of the Dark Gods
Chaos Space Marines
Being of the Warp; servants to the four Chaos Gods
Daemons
Warmongering, greenskinned xenos who use ramshackle technology and have British accents; same name as Tolkien's antagonists
Orks
Super long-lived, elegant xenos; declining numbers after their society collapsed 10,000 years ago due to Slaanesh. Some wander the galaxy, some raid and torture, and some love a good joke
Aeldari
Undead, skeletal robots who fought the above 66 million years ago
Necrons
Young, upstart xenos empire; believe in allying all species in the galaxy under their banner "for the greater good.''
T'au Empire
Resemble muscular, short humans; worship AI and greedily strip-mine planets for resources
Leagues of Votann
Swarming, insect-like xenos who devour everything in their path
Tyranids
Insidious cults who worship the above as gods and merge the aliens' DNA with their own