 They were originally a red-skinned humanoid race until Naga Sadow conducted cruel genetic experiments on them turning them into a race of fearsome, savage, hunchbacked predators.Despite this cruelty, the Massassi treated Naga Sadow as a god by building huge temples and palaces to honor their Sith Lord.They became extinct when Exar Kun sapped the life out of every Massassi on Yavin 4 so that he could free his soul from his body in order to escape the pursuing Jedi.