|Book(s)|| A Storm of Swords (mentioned)|
A Feast for Crows (mentioned)
A Dance with Dragons (appendix)
Nysterica is homely and has a pox-scarred face, but seems happy.
A Storm of Swords
A Feast for Crows
Nysterica is one of four septas to examine Margaery's maidenhead after Ser Osney Kettleblack comes forward with claims that he slept with her. The four septas find the maidenhead not intact, which becomes the grounds for Margaery's arrest. Nysterica is confined to a penitent's cell for failure to do her duty.