I'll need to fully master DFF first and then purchase this game.
Nahh I wouldn't, the entire first game is included in DDFF, and is better.
Just got my Warrior of Light DLC...booted up the game, when out of the blue, Warrior of Light shouts "SQUARE ENIX" then "DISSIDIA DUODECIM, FINAL FANTASY"
Yeah this has happened to me a few times, seemingly at random too!
Kinda freaked me out.
I think I have heard Kuja, Squall, and Yuna say it.