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[[Image:Harpax.jpg|thumb|right|220px|Harpax swarm{{Fn|2}}]]'''Harpax''' were a class of [[A.I.|artificia]] [[Robot]] of ancient origin used by [[Dark Mechanicum|traitor Mechanicum]] during the [[Horus Heresy]]. Flying  A type of [[Silica Mutus]]{{Fn|2}}, these flying drones that grew in intelligence in accordance to their numbers. They are usually used as scouts, ranging ahead of larger [[Stalker Cohort]]s. They are armed with [[Exo-Planar Repeater]]s for anti-infantry or [[Lascutter]]s for anti-armor roles, overwhelming their enemies through sheer weight of numbers.{{Fn|2}} Harpax were encountered by the [[Dark Angels]] on [[Galatia]] during the [[Thramas Crusade]].{{Fn|1}}