Reminder that even if you removed the Nihility requirement from Acheron, she would still be bad. The problem is while she doesn't want Nihilities because they're just worse than Harmonies, she also does want them because she needs stacks to maker her ult.

Each Nihility you use, you speed the stacks, but you lose power because you're not using an Harmony in that slot.
Each Harmony you use, you gain power, but you lose stack speed.

The only way, and ONLY way Acheron will ever be good, is when they unbrick the most bricked path in this game and stop being afraid of making Nihility units as good as Harmony. Also bosses shouldn't lose all debuffs on phase-change that's so fucking retarded why the fuck do they.