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Lena Sayers first appears in Chapter 20, residing in the Black Valley; she mistakes Mashiro Blan de Windbloom for Arika. It is revealed that her home village was destroyed mysteriously and she was rescued by Rad.During an attack by Cardair, Nina Wong recognizes her as the previous user of the Blue Sky Sapphire.In the aftermath of the Cardair invasion of the Black Valley, she is brought to Garderobe for medical treatment, under the care of Juliet Nao Zhang.

Source from Wikipeida