From A Wiki of Ice and Fire
Nysterica is a septa assigned to House Tyrell.
Nysterica is homely and has a pox-scarred face, but seems happy.
A Storm of Swords
Septa Nysterica accompanies Lady Margaery Tyrell to King's Landing for her wedding to King Joffrey I Baratheon.
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.
- ↑ 1.0 1.1 A Storm of Swords, Chapter 6, Sansa I.
- ↑ A Feast for Crows, Chapter 43, Cersei X.