Acheron

Meets the Trailblazer at the start of the Penacony chapter. Claims to be a Galaxy Ranger following the Path of the Hunt. Acheron killed Duke Inferno of the Ever-Flame Mansion as he was enroute to Penacony, and stole his invitation to the Charmony Festival. However, multiple important characters on Penacony have doubts about her true identity. Aventurine and Sunday think she is a suspect in the death of Robin. Welt finds her attitude suspicious even while teaming up with her for his own investigation. And Black Swan the Memokeeper has trouble seeing her true memories until an actual Galaxy Ranger named Boothill tells her that she is "an Emanator Who Should Not Exist."

Later on, Aventurine goads Acheron into unleashing her sword, taking him behind the scenes of the Dreamscape in Penacony, and revealing her true form as an Emanator of Nihility, and a Self-Annihilator at that. It is unknown why IX, the Aeon of Nihility, would cast their gaze on anyone, let alone Acheron. Even Boothill is unsure how exactly she earned IX's power and such an Emanator. Nonetheless, Acheron turns out to have laid to rest one of the three Trailblazers who was foundational in building the current Penacony. Despite Boothill's threat to put a bullet in her head, she helps to rally the Nameless and other strong-willed individuals, including Boothill himself, to wake up from Ena's dream and stop The Order from taking over Penacony.

Gameplay

Acheron is a powerful 5* follower of Nihility who wields the Lightning element. Her Ultimate is unique in that it does not build up with Energy like other characters, but with Slashed Dream meter, which is filled whenever Acheron uses her Skill Attack (Octobolt Flash), or when an ally inflicts a debuff on the same enemy, When the Slashed Dream count hits 9, Acheron can unleash her Ultimate (Slashed Dream Cries in Red), which deals multiple slashes, damaging all enemies on the field, and can reduce the Toughness of every enemy, not just those weak to Lightning.