darth tenebrous (rugess nome) was a male bith dark lord of the sith with the power of foreseeing the future, including his own death, and was the master of both darth plagueis and darth venamis, the latter of whom he kept secret as it was a violation of the rule of two. his public persona was rugess tome, a legendary artisanal starship designer with a galaxy-spanning reputation, and he was known for being a scientific genius and master planner, as well as for his breathing apparatus. tenebrous' secret plan was to possess the chosen one once he would appear, but he was eventually killed by plagueis during a mission on the planet ban'demnic. however, tenebrous wasn't too surprised at plagueis's betrayal and instead congratulated him with his dying breath, because his conscience would soon be able to enter his apprentice's body. despite managing to cheat death, tenebrous' plan failed, because, during his time in plagueis' body, he foresaw him being killed by his own apprentice before the appearance of the chosen one, meaning that tenebrous would never be able to possess him. tenebrous then tried to escape from plagueis' body, but only saw the mummified remains of his original body, as decades had passed since his death. thus, tenebrous was cursed to remain a vague spirit for the rest of eternity, unable to gain a physical body ever again.