That would probably be explained through Lore cards or WQ campaign itself who knows
Personally i like believing she somehow got an idea of how to create her own version of the light because of Sagira but who knows really
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I kinda like your idea and I wanted to ask do we know for sure that Sagira is "dead"?
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Well we never really saw sagira “Die” but our ghost felt it as the same we felt Caydes ghost die. So i would assume shes dead