FrostNova, also known as Yelena, is a prominent antagonist in the mobile game Arknights. She is a member of the Reunion Movement, an organization fighting against societal oppression, and serves as the leader of the Yeti Squadron. FrostNova is known for her powerful Originium Arts, which allow her to manipulate ice and snow, making her a formidable opponent. Despite her role as an antagonist, FrostNova's character is complex, as she struggles with her own beliefs and the harsh realities of the world she inhabits. Her tragic story adds depth to the narrative of Arknights.