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The Sisters of Cydonia were a cult of female Tech-priest assassins within the Adeptus Mechanicus and lived on their homeworld of Mars in the Cydonia Mensae. They were noted to serve no authority beyond the unknown masters that lived in their own lands. One member of the Cydonian Sisterhood aided members of the Dark Mechanicus during the Horus Heresy at the time of the Martian civil war known as the Schism of Mars.
- Mechanicum (Novel) by Graham McNeill