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That Nightmare that she tried to use to trap my mind inside and catch me off-guard showed me more than I imagined. Freyja's past, of what she went through, and how she ended here to begin with. Even before being dragged into this war, she faced Odin, who tried to coerce her into giving away her child and that Yggdrasil Tree of Dreams made from an Origin World Core Fragment from Genesis.
It was her treasure, a giant tree she had forged over thousands of years, a treasure where her son, destined for greatness, was developing. Odin, controlled by someone else, perhaps this "sister" that Sapphirine talked about, used a wounded, dying Freyr to convince her to give away the tree in exchange for her brother.
Freyja had to take a terrible decision, an ended giving away her child to save her brother, showing how much she loved Freyr…