Oh, and isn't that a loaded question, asking her what she's fighting for. There are so many things that she's fighting for, that one would be hard-pressed to answer.

But it all boils down to her sister, and the rest of her family. It's why she'd given up a life with them in their new homes to be the protector of a goddess being targeted by a man driven mad by his own immortality.

Damned if she tells a random stranger that though. So all she says is, "My world."

Because it's true. If the goddess dies and Caius succeeds, the entire world would be lost, and Lightning cant have that, not when her family is right there. Serah, waiting for her to come home, Snow, desperately searching for her just so she can see them get married, Hope growing (grown) into a man and improving lives everywhere, Sazh and his son moving from place to place in their airship, and Fang and Vanille in their eternal crystal sleep, holding Cocoon up. If the world is gone, they would go with it.

Lightning cant let that happen, and that's why she fights.

"So you can tell that I'm not pleased about being in this one." Not pleased being the understatement of the century.