Zanjo Fel was an Iktotchi member of the Remnant Sith Order after the Jedi Civil War, residing in Trayus Academy on Malachor V. As a Sith Marauder, he was extensively trained in the use of a lightsaber, but he was also proficient at altering minds with the Force.
When the Galactic Republic launched a surprise attack on Malachor in 21,108, Trayus Academy was mostly destroyed. However, Fel was among the survivors who escaped to the nearby Singularity Base, along with his friends and fellow Marauders Gorbus and Yaiban Retwin, as well as Headmaster Thoriel Silbus. As Republic troopers invaded the facility, Fel and Retwin accompanied Silbus to the control center of the base, acting as a last line of defense against any infiltrators.
In time the control center was penetrated by Atton Rand, the former apprentice and lover of Dark Lord Meetra Surik. Fel and Retwin dueled Rand for some time. Despite their skill, both Marauders ultimately perished in the battle; Fel was sliced in half while leaping over his opponent, and moments later his Twi'lek comrade was fatally stabbed.