Twilight Odin is a boss in Final Fantasy XIII-2. He is the physical manifestation adopted by chaos, utilizing memories of the Eidolon Odin, and is fought by Serah and Noel in the Vile Peaks 10 AF and 200 AF after attacking a patrol ship full of Academy soldiers. After defeating Twilight Odin in the Vile Peaks 10 AF, the party receives the Twilight Fragment Alpha, and by defeating Twilight Odin in the Vile Peaks 200 AF, the party receives the Twilight Fragment Beta.