A blade forged for the knight who would watch over Valhalla in the goddess Etro's place.
While not named anywhere in the game, Overture serves as Lightning's iconic gunblade, capable of switching between sword and gun modes, similarly to gunblades from Final Fantasy XIII. She wields it while playable in the prologue, in the Lightning's Story: Requiem of the Goddess downloadable content and as a Paradigm Pack "monster" ally in her Knight of Etro appearance. The weapon was granted to her by the goddess Etro when Lightning was made her champion.
Overture is a sword available to PlayStation 3 and Xbox 360 players who own a save file from Final Fantasy XIII-2 on the console in question, and PC players by default, although they first need to enable DLC and can only be acquired via Rewards Barter Shop in the menu. The first copy is provided for free, but subsequent copies cost 200,000 gil. Overture raises maximum HP by 500, Strength and Magic by 280, and comes with the auto-ability Arsenal of One which increases the damage and absorption rate of Army of One.
Overture in music is the term originally applied to the instrumental introduction to an opera. The word overture means opening or introduction.