Galeroth Felgrimm commands the Black Banner army as its supreme leader, directing its forces against Evermore. He originates from another world and is the alter ego of Crown Prince Sedulus Astrum. This connection establishes him as the uncle of Astrid. Galeroth Felgrimm is also linked to an additional alter ego known as Gnauss Wisden. His background before leading the Black Banner remains unspecified.