The Hundred-Year Darkness was a period of time that led to the formation of the Sith, who were once considered brothers in the Force with the Jedi Order. The birth of the Sith led to a number of wars over the course of galactic history.
The Shadowfang Beast was created during the Hundred-Year Darkness.
Initially, the Jedi Order and the individuals who became the Sith were considered brothers in the Force. Around 5000 BBY, this unity fractured, during the period of time known as the Hundred-Year Darkness, when a rogue Jedi came to believe that the true power of the Force lay not through contemplation and passivity, and that only by tapping its dark side could its true potential be reached. The Jedi High Council balked at this new direction and the fallen Jedi was cast out, but he gained followers and formed a new order, which eventually became the Sith. They shared their name with the Sith, a red-skinned species with tentacles, susceptible to using the dark side of the Force.
According to a later Sith Lord, Darth Sidious, the Sith "rose up" against the light side of the Force. During the Hundred-Year Darkness, hellhulk stations were used, and the Shadowfang Beast, a bioconstruct that generated a resonance-absorptive shield, was created. The Tah'Nuhna species were neutral during the war.
Numerous wars ensued between the Jedi and Sith following the Hundred-Year Darkness.
The planet Korriban, later known as Moraband, was the homeworld of the Sith Order. As they grew, they constructed massive temples and tombs on Korriban in a location known as the Valley of the Dark Lords.
The birth of the Sith led to countless wars between the two rival sects. During one of these wars, the Sith ultimately became the dominant power in the galaxy for a period of time. They had captured the planet of Coruscant, the capital of the Republic, and constructed an immense black shrine over a light side vergence on a mountain at the heart of the planet no later than close to five millennia before 14 BBY.
The Sith were believed to have been destroyed in the Jedi-Sith War, but they eventually returned to galactic prominence and ushered in the Clone Wars. Both sides of the war were controlled by Darth Sidious, known publicly as Supreme Chancellor Sheev Palpatine, and allowed him to gain enough power over the galaxy to transform the Galactic Republic into the Galactic Empire in 19 BBY. This led to Sith rule over the galaxy.
During the Mission to Skako Minor around 1 ABY, Doctor Chelli Aphra discovered a hellhulk station in the workshop of the Skakoan Techno Union chairman Wat Tambor on the planet Skako Minor. An Imperial Delta-class T-3c shuttle that crashed through the wall of the laboratory activated a techno-totem displayed in the workshop, which awakened a cybernetic Chthonic worm god known as the Hellhulk.
The Imperial Era lasted until Sidious' first death during the Battle of Endor in 4 ABY. The Sith Eternal cult conspired to revive Sith rule across the galaxy, but the return of the Sith was aborted by Sidious' final demise during the Battle of Exegol in 35 ABY.
The Hundred-Year Darkness was first mentioned in the current canon continuity in the 2015 comic book Star Wars (2015) 9. The conflict originated in the Star Wars Legends continuity's comic book series Star Wars: Tales of the Jedi.
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