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'''Asphyx Shells{{PAGENAME}}''' were weapons used by the [[Thousand Sons]]. Tainted with a psycho-reactive toxin of unknown origins, the Thousand Sons were able to arm their elites with these unusual and highly lethal munitions. These shells were first believed to have been developed on [[Prospero]] for use with relatively primitive projectile weapons made to defend against the [[Psychneuein]], but the difficulties of mass production and scaling of their effect limited their deployment.{{Fn|1}}