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|episodes= [[6.13 Unforgiven]]

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Arachne are humanoid monsters with spider-like abilities and attributes. They haven't been seen outside of Crete in 2,000 years, but a female arachnid appears in Bristol, Rhode Island, in 2010/11. Their poisonous bite can turn humans into arachne. Once turned, arachne can mate and produce offspring. Because of their rarity, there is little lore on them or on how to kill them.<ref name="six13">[[6.13 Unforgiven]]</ref>