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Darth Nihilus was a Human male who reigned as a Dark Lord of the Sith during the era of strife following the Jedi Civil War. Before becoming a Sith, he lost everything during the Galactic Republic's war against the Mandalorian Neo Crusaders. He survived the activation of the Mass Shadow Generator superweapon during the war's final battle at the planet Malachor V, which surrounded the planet with a destructive spacial phenomenon known as a mass shadow that obliterated almost everything and everyone on and around the planet. The experience of the shadows made him "hunger" for Force energy, and the affliction began to ravage his body. In his pain he became a wound in the Force and was found by a seeker of such things, the Sith Lord Darth Traya. She told him that she could teach him to feed his hunger. He accepted her offer, becoming Traya's apprentice at the Trayus Academy on Malachor V. Over time, he became one of three concurrent Dark Lords of the Sith.
Together, the three formed a triumvirate with Traya at its head and her other apprentice, Darth Sion, as the third member. The trio chose individual names for themselves and Nihilus became the Lord of Hunger. The apprentices grew in strength during their training and eventually overpowered their Master. Sion defeated Traya, while Nihilus sapped her energy, before the two Sith exiled her and combined their powers to sever her ties to the Force. Nihilus's affliction developed to the point where the Dark Lord was forced to call upon the dark side of the Force to encase his spirit within his mask and armor to stay alive. Nihilus and Sion then became the main perpetrators of a Jedi purge, causing the virtual extinction of the Jedi Order. Nihilus was responsible for the devastation of the planet Katarr, killing and absorbing the Force energy of the Jedi at the Conclave on Katarr, along with every other living thing on the world, save one Miraluka woman named Visas Marr. Nihilus took Marr from the surface and made her his Shadow Hand.
One year later, Nihilus sensed a growing presence in the Force, and sent Marr to investigate and destroy it. The presence was a female Jedi, known only as the Exile, who was on a quest to find the remaining Jedi Masters who had survived the Purge. When Marr attempted to assassinate the woman, the Exile defeated her and convinced her to turn to the light side of the Force in the process. Although Nihilus returned to lurking the fringes of known space, the man was eventually tricked by Traya into initiating the Battle of Telos IV in an attempt to absorb a Jedi Academy without any actual Force-sensitives aside from the Jedi Master Atris. At Telos, the Sith Lord met a large fleet comprised of Republic and Mandalorian forces. In the carnage, his flagship Ravager was secretly boarded by a small force consisting of the Exile, Marr, Mandalore the Preserver, and his Mandalorians. The trio successfully killed Nihilus and destroyed the Ravager. Four millenia later, Nihilus' holocron was in the possession of the Dark Lord Darth Krayt, the founder of the One Sith Order and Emperor of his Galactic Empire.