Thrawn Ascendancy, also known as Thrawn: The Ascendancy Trilogy or simply The Ascendancy Trilogy, is a trilogy series of Star Wars novels released in the years 2020 and 2021 consisting of the books Chaos Rising, Greater Good, and Lesser Evil., all by author Timothy Zahn. The books follow Thrawn as he rises through the ranks of the Chiss Expansionary Defense Fleet as war brews between the various Chiss families throughout the Unknown Regions.