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The Sisters of Cydonia, also known as the Cydonian Sisterhood, were a sect of techpriest assassins within the Adeptus Mechanicus who lived on the red planet of Mars in the Cydonia Mensae region.
They were noted as being a law unto themselves and answered to no authority beyond their unknown masters within their homelands. Its members were noted to be augmented both mechanically, chemically and genetically to enhance their natural abilities and make them superior killing machines.
By the time of the Horus Heresy, one such sister of the Cydonian Sisterhood called Remaire served with the Dark Mechanicum.[1]
