Codex: Genestealer CultsGenestealer Cults are fanatical sects of alien hybrids that infest Human worlds beyond count. They lurk unseen for generations, hiding and preparing in the dark until their Day of Ascension arrives. Then they rise in a tide of mutated acolytes, turncoat soldiery, and predatory xenos monstrosities to tear down those they see as oppressors. Codex: Genestealer Cults contains a trove of background information covering prominent Genestealer infestations