Rwby: forbidden hope

Ignia Nytelock isn't a normal person. but her past is a secret she guards carefully, as is her semblance. everything about her is a mystery, especially considering she appeared at Beacon Academy seemingly out of thin air. but when Beacon Falls and she is taken to atlas for questioning, can anyone pry her secrets out of her? and why is she so adamant at not talking about her past? but most importantly, why is salem so adamant about wanting ignia?.