In the fictional universe of Warhammer 40, 000, the Dark Eldar are a Kindred of the Eldar, an ancient and advanced race of elf-like humanoids.
In the fictional universe of Warhammer 40, 000, the Squats are a dwarf-like race descended from the humans that colonised high gravity worlds.
In the fictional universe of Warhammer 40, 000, the Old Ones traveled through space manipulating minor species on several planets and growing them into tools for their battle against the C ' tan.
In the fictional universe of Warhammer 40, 000, the Slann were a reptilian or amphibian species who were servants of the Old Ones ( although some sources state that they in fact are the Old Ones ) not unlike the Lizardmen of Warhammer Fantasy.
In the fictional universe of Warhammer 40, 000, psykers are individuals with some form of psychic ability.
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