Feskoro was a Chiss Sith master in the Brotherhood of Darkness. Feskoro was a powerful Sith Lord who trained the powerful Darth Dastronomir. As he grew older, he began to go mad, becoming prone to mad, random rages, where he would lash out at anybody and anyone. He trained Merkory Chal'wala in the Brotherhood of Darkness before Darth Dastronomir commanded Merkory to kill Feskoro. Feskoro knew that this would happen, so he had never let Merkory train against a double-bladed lightwhip of the sort he wielded, so Merkory was at a disadvantage. Yet Merkory prevailed, and Feskoro was killed.