Giedon Desca was a Rebel soldier in Ban's group. He was one of the few people that knew Kenovi's secret. Giedon had killed Ryes Baxter after he was convicted. Desca also fought in the Imperial attack on the Rebel base.
Desca was a Rebel soldier who was to protect anyone even himself from being killed.
Giedon was one of the last true Rebels from Ban's group as the others had already been killed but Giedon was still killed by Macen Tribeal.