Acheron is a mysterious and powerful character in Honkai: Star Rail, known as the Galaxy Ranger. She is a solitary drifter who travels across the cosmos, hiding her true intentions and wielding a sword that channels immense energy. As a 5-star Nihility Path Lightning character, Acheron plays a significant role in the Penacony story arc. Her enigmatic personality and striking design have made her a fan favorite, and her past remains shrouded in secrecy, contributing to the intrigue surrounding her presence.