A Luminoth Keybearer in Metroid Prime 2: Echoes, S-Jrs was killed fighting the Ing after being intercepted on his way to Aether to gather reinforcements for the ambushed Keybearers. This occurred at the Sanctuary Entrance of the Sanctuary Fortress. A-Kul, in one of her clues, labeled S-Jrs as loyal, but any other properties of the warrior are unknown.