Silvana. The lost princess, the last of her kind. You met her once, became her friend long ago and you promised to return. You promised to rescue her from the spirits of the forest and return her to the kingdom. The kingdom that's had a thousand years to change. You studied and learned to harness the power within. You joined the elite ranks of the Mage, the new ruling class.
And you returned. Again you found her sacred forest and her. You battled the spirits that kept her confined to the forest and weakened them. The spirits weak, you took the princess and returned her to the world. She's your prize for a battle won and a source of unending mana.
Your desire to save her blinded you to a simple fact. She didn't want to be saved. She was happy, content and safe. The spirits taught her, showed her magics long lost to the world. The princess fights back and forces you to bind her powers, making her helpless and vulnerable to your will.