A BattleChief represented a type of capital ship utilized by the combative Grysk species. Grysk Prism-class BattleChiefs possessed engines and a hyperdrive, and their weaponry included spectrum lasers and missiles. In terms of size, they were somewhat smaller compared to a Chiss heavy cruiser, but larger than either a Chiss light cruiser or a patrol cruiser.
During 18 BBY, the Grysk operative "Jixtus" commanded a fleet that contained eleven Prism-class BattleChiefs. Every one of them was obliterated during a confrontation with a Chiss Ascendancy fleet above the planet "Sunrise" situated within the Unknown Regions.
The BattleChiefs made their debut in the 2021 book Thrawn Ascendancy: Lesser Evil, which served as the concluding part of Timothy Zahn's Star Wars: The Ascendancy Trilogy.