The Monolith was a type of Sithspawn created by Vitiate, the former Sith Emperor of the reconstituted Sith Empire, during his time on the planet Ziost. Monoliths were beyond normal Sithspawn; they were seemingly unkillable creatures that were built from the dark side itself rather than by mutating an existing creature. As Vitiate's power over the population of Ziost grew, he was able to create larger and larger Monoliths, and after the Invasion of Ziost ended with Vitiate consuming all life on Ziost, two particularly large Monoliths—known as the Colossal Monolith and the Worldbreaker Monolith—were among the Monoliths that survived on the now barren and ashen surface of the world.
- Star Wars: The Old Republic (First appearance)
- Star Wars: The Old Republic: Knights of the Fallen Empire (Vision)