When she was of-age, Silvane joined the rebellion against the Garleans to free her village and Doma, but failed and was captured by the Imperial. Used as bait against a primal, she was shielded from the tamper when her echo awakened at the same time. 

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Seeing that she survived and was not tampered, Silvane was imprisoned by the Garleans for the study of Echo, forced to endure grueling experiements and torture that almost break her sanity and self. 

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She held on to Zenos at that time as an anchor, believing the prince to be able to save her from the pain and the torture, though he was more interested in pushing her limits (Emotionally, physically and sexually) all for the sake of the research on the Echo. 

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She would've been too broken if not for the man who rescued her and brought her to Eorzea.