Resh was an Ilari general who was loyal to Tieran, a tyrant who tried to take over the Ilari homeworld. At first upon discovering that Tieran was occupying the body of Kes, he had doubts about their attempt to take over the government. He was convinced when Tieran used Kes' mental abilities to inflict pain upon him following bleeding from one of his nostrils. Tieran later named Resh First Castellan due to his loyalty.
He was in command of four hundred troops who he led in a civil war to help impose Tieran as the new ruler. With the help of the USS Voyager, the legitimate rulers were able to defeat him. He was killed by Demmas in the rescue attempt of Kes. (VOY: "Warlord")