Erebonian refers to anything related to the Erebonia region, a fictional territory in the Trails series of video games developed by Nihon Falcom. This region is known for its rich history, diverse culture, and complex political landscape, often featuring themes of conflict and social issues. In the Trails of Cold Steel sub-series, Erebonia is depicted as a powerful nation with a strong military and a class-based society. The story explores the lives of students at the Thors Military Academy, where they navigate personal relationships and the challenges of their world, ultimately influencing the fate of Erebonia itself.