2. Acheron (2) Apr 2026

In Honkai: Star Rail , Acheron 's second Eidolon (E2), titled is widely considered one of the most impactful upgrades in the game. It fundamentally alters her team-building restrictions and accelerates her damage cycle, transforming her from a niche "Nihility-only" carry into a universal powerhouse. Key Enhancements of E2

: At E0, Acheron requires two additional Nihility teammates to maximize her damage multiplier (160%). E2 reduces this requirement to just one other Nihility unit, freeing up a slot for powerful Harmony supports like Robin or Sparkle . 2. Acheron (2)

: Her first Eidolon (E1) already provides an 18% Crit Rate boost; combined with the stat-heavy buffs from Harmony units allowed by E2, her damage ceiling increases exponentially. Strategic Value In Honkai: Star Rail , Acheron 's second

: At the start of her turn, she automatically gains one stack of Slashed Dream and inflicts one stack of Crimson Knot on a random enemy. This significantly reduces her downtime between Ultimates. E2 reduces this requirement to just one other

: Acheron + Sparkle + Jiaoqiu (or Silver Wolf/Pela) + Aventurine .

: Acheron + Bronya + Sparkle + Sustain (very high investment).