AU-ish: On a visit to Rivendell, the daughter of Lord Elrond catches the eyes of Thranduil. His seemingly cold heart begins to warm to her and they quickly become entranced with each other. She brings a light to his life and a stubbornness to rival even Thranduil's. Their love will last for centuries but they will encounter both happiness and hardship along the way. Thranduil/OC