In 1989, Men of War used hydro-pulse rifles when attempting to subdue Queen Atlanna in Amnesty Bay. Atlanna was able to disarm one of the soldiers of their rifle, using it to hold off the Atlanteans before being outnumbered and forced to surrender.
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Hydro-Pulse Rifles are able to convert water into ionized energy through the process of fusion, firing plasma bolts powerful enough to send an Atlantean flying.