Ever since her appearance in Genshin Impact Dragonspine, Rosaria has been quite popular in the community. Both Dragonspine and her cold persona are well-suited for her Cryo Vision. The Sister's dark past is likely the reason for this demeanor, where as a child, Rosaria was trained by bandits, people who use her to steal and deceive. Later on, this skill comes in handy when Varka allows Rosaria to redeem herself.
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Rosaria bears the title of a nun, but her disposition does not reflect this at all. This is because the Nun only uses the title to hide her actual job for Mondstadt, protecting it from the danger that lurks in the night. In the players' party, Travelers can surely rely on her to provide some great support. Unlike most 4-star Genshin Impact characters, Rosaria does not rely on her Constellations to be an amazing unit.
Rosaria’s Constellations aren’t game-changing and don’t even change her gameplay. They’re small enhancements to her abilities that she can live without. In short, Rosaria will perform better with Constellations, but she still is amazing without them. If players don’t want to invest much in Rosaria’s Constellations, it is recommended to at least seek her C2 as it enhances her Sub-DPS/Support capabilities.
C1 Rosaria buffs her Normal attacks damage and speed. This can come in handy if she’s built to be a Main DPS.
As a Sub-DPS, the four seconds increase to her Elemental Burst is crucial for her role. C2 Rosaria’s effect adds two hits to her burst, adding more damage in addition to the continuous Cryo application.
Rosaria's C4 adds more energy regeneration from her Elemental Skill, but as she's already a good battery in Genshin Impact, this
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