The Second Defense Overlord was a role within the Garwian Unity, a nation situated in the Unknown Regions Unknown Regions. This position was held by the Garwian Garwian Frangelic Frangelic in 19 BBY, subsequent to his tenure as Security Chief Security Chief. He later advanced to the role of Senior Security Chief Senior Security Chief by 18 BBY.
The novel Thrawn Ascendancy: Chaos Rising, which was released in 2020, featured the Second Defense Overlord. This novel marked the beginning of Timothy Zahn's Timothy Zahn Star Wars: The Ascendancy Trilogy.