Rosa

Strategy: Rosa exists to solve a specific problem: sustained debuffs that would otherwise cripple your march for the whole fight. Battle Focus doesn't just clear whatever's already been applied — it grants five full seconds of debuff immunity on top, which means she can walk into a fight against a hero like Petra or Sophia and simply refuse to be controlled during the window that matters most. That's a hard counter, not a marginal one, and it's why she stays relevant in PvP long after most Gen 4 heroes fall off. Her second job is healing denial. Swoon Chakra cuts enemy healing by 60% across all enemy squads — against any composition leaning on Hilde or another sustain hero, this alone can swing a prolonged fight, since Rejuvenating Plea and Redeemer both lose most of their value when the target's healing received is already gutted before the heal lands. Skill priority: Battle Focus first, always — it's both her defensive core and her offensive attack buff in one cast. Swoon Chakra second if you're facing sustain-heavy alliances, Flutterfang second if you need the raw damage instead. Rose of War's flat -20% enemy damage is good passive value regardless of build. She's not a rally lead in the way Vivian or Yang are — think of her as insurance. Even after you unlock Vivian, keep Rosa geared as your answer to control-heavy or sustain-heavy enemy comps rather than retiring her outright.