This is the second entry in our Nihility main DPS review series for Honkai Star Rail, covering 5-star character Acheron. We break down her game-changing ultimate mechanic, explain why she requires two mandatory Nihility teammates, and cover new metrics to evaluate her team performance. How Acheron’s Team Restrictions Make Her The Peak of Ultimate-Focused DPS: A Mechanic Revolution Rewriting Nihility Main DPS RulesIn the combat system we all know, the blue energy bar next to every character’s portrait is the core that powers all ultimates. We build entire teams around it: we bring Tingyun to generate energy, equip Energy Regeneration Ropes to speed up energy cycling, and even use Huohuo’s ultimate to charge up the entire team. Energy is the only currency for ultimates in traditional teams, and every tactic we use revolves around charging that 130 or 140 energy bar as fast as possible.Then Acheron stepped onto the battlefield. Her energy bar is gray, completely locked away by a…