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In the games as she generally only shows up as stage 1~2 bosses, she isn't that strong. In particular, fairies have an existence below that of humans.[3][4] However, among fairies she possesses unusually strong power.[5] She was playable in Phantasmagoria of Flower View and was able to defeat Reimu Hakurei, Marisa Kirisame, Sakuya Izayoi, etc. Technically when she "defeats" Aya Shameimaru and Yuuka Kazami, she didn't really defeat them as they still appeared unhurt after battle, implying that it was Cirno who ran away. In Fairy Wars, even though she wins when she battled Marisa, the one whose illustration showed to be "defeated" was Cirno; it was a simple case of Marisa letting her guard down.
In Perfect Memento in Strict Sense, according to the other fairies, while such things are written as "if she schemes, she is caught, so it is good even to refresh oneself of one's habitual anger," among it, there does exist the warning "if you meet her, you should flee." Furthermore, Eiki Shiki, Yamaxanadu commented on her saying "although you are a fairy, you possess great power". Since she goes beyond the limits of fairies, there may be the possibility of dying.
If humans were to fight her gracefully, it would seem that the weapon would become frozen and it wouldn't be possible to win to begin with, but if we were to just run away, if we poke at the point that she is an idiot, we are able to run away immediately, since she is not able to answer even simple riddles.[6]
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