Jaymes Powder was a Cuarto of the Salusan Militia. During the Battle of Zimia he and Rico were ordered by Tercero Xavier Harkonnen to work with med-response teams and fire-suppression squads. Powder then appeared as Harkonnen's adjutant, participating in the Liberation of Giedi Prime, the inspection of the League ships in the Poritrin shipyards, and he saw personally that military personnel install and test the Holtzman shields in the javelins. During the Battle of Earth, he was alongside Harkonnen in his ship.