Everything at the top of the Pharos. It honest to god feels more like teh climax of the game than the actual climax of the game.

Gabranth shows up and does his thing only for Ashe to swear off her vengeance at last. She and Gabranth served as rather good foils in a way.
Then Dr. Cid shows up and reveals what he's been up to all this time.
Then he dies ad we have a rather touching send off.
Finally, the Sun Cryst is going haywire so Reddas sacrifices himself to destroy it.

So many great lines, so much raw emotion....

THE DEAD DEMAND JUSTICE.
Hadn't you best be off, fool of a pirate...
I, JUDGE MAGISTER, CONDEMN YOU TO OBHLIVION!