Night soil

Night soil is a euphemism for human or animal excrement. It is sometimes applied to weapons such as arrows to turn the wounds they inflict septic.

At the Second Siege of Riverrun, Edwyn Frey suggests that Riverrun will fall, if Ser Brynden Tully dies. Thus he proposes to stage an attack on the castle, then target the Blackfish with archers whose arrows will be smeared with night soil when he comes to lead the defense. The proposal is dismissed by Lord Karyl Vance and Ser Lyle Crakehall, who consider such an approach ignoble. ^[1]

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