Vindican

Vindican was a male Pureblood Sith lord who served the Sith Empire in the early days of the Great Galactic War. Having been trained in the dark side of the Force by the conservative Darth Ikoral, Vindican advanced to the rank of Sith Master and took an apprentice of his own—the young Human Malgus.

Traversing the World between Worlds
While studying the Holocron of Darth Andeddu, Vindican came across a ritual involving the connection to a Force Nexus. Upon starting the ritual, Vindican opened a door to the World between Worlds, however, this was not the World between Worlds of his time. It was here where he met the Jedi Ezra Bridger, who told him of his apprentice's eventual betrayal, and how Malgus planned to conquer the current Galaxy.

Enraged by his apprentice's eventual betrayal, Vindican agreed to help Ezra Bridger lure Jorel Eros to Lothal, where they would then hunt down various artifacts that Malgus had imbued his soul to, granting him immortality.