Their war cry is "all is dust." I've read Thousand Sons, Ahriman: Exile, Ahriman: Sorcerer, and Tale of Ctesias. And I don't recall anyone ever saying that line. There's always references to dust, like when the guy tries to trap and burn Ahriman in his own mind and says something like "dust to dust" or something, but no one ever says "all is dust." In any battle, whether it's Ahriman and his band of renegades fighting every demon in the galaxy, or Ctesias summoning an army of demons to defeat other demons, or when they were fighting the Inquisition fleet, no one ever says that. Because who would say that? The Rubricae? Those few sorcerers? The Tzaangors? They never use their warcry. Are only TSons so autistic or do other legions also not give a damn? And yes, I am ESL mon-keigh.