FFx-2 last mission is a whole new game, it's like fftactics but you progress through a 100 level tower and on each 10th level there is a cutscene. It's really challenging and fun if you like FFT and such. FFx-2 international version also has a new colosseum mode wherein you fight the hardest of the bosses in the game(some are new like Shinra and the uhh giant orochi snake thingy). You can also "catch" creatures and characters in the game and use them as your party member. You can catch all the old character from ffx and ffx-2 including seymour, tidus, brother, nooj and gang, la blanc and gang, trema, chocobos, and A LOT more.
Eternal calm is just a cutscene which happened after ffX which most of you probably know.








