Malachor

Malachor was a rocky, hellish wasteland planet located in the Chorlian sector of the galaxy's Outer Rim Territories region. It was a planet shrouded in mystery, and the location of an event known as the Great Scourge of Malachor, which took place thousands of years before the rise of the Empire. The Great Scourge was an ancient battle at Malachor's Sith temple between the Sith and the Jedi Order, which saw a superweapon activated, killing and petrifying all the participants of the battle, remaining for years after.

During the Imperial Era, Jedi Master Yoda told Ezra Bridger, a Padawan, to find Malachor to help him defeat Darth Vader and the Inquisitors. Bridger, alongside Kanan Jarrus and Ahsoka Tano, traveled to Malachor, where they found the former Sith Lord Maul in exile. Together, they killed three Inquisitors, but Maul blinded Jarrus and escaped, consumed by revenge against the Jedi as well as his Sith Master, Darth Sidious. In the chaos, the Malachor superweapon was nearly re-activated before being destroyed, and while Bridger and Jarrus also fled Malachor, Tano narrowly survived her duel with Vader; years later, Bridger reached through the fabric of space-time to save Tano from Vader's clutches during the duel. With Tano spirited away, Vader departed with his armor scarred by battle, and Tano later returned to the duel's aftermath in order to continue her journey under Malachor's surface with the guidance of Morai.

Text and facts from the “Malachor” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.