I've been fighting the final boss (zeromus, I think was it's name). I got my ass handed to me by him when I fought against him. Like how do I kill this thing?
My party is
Lv 56 Cecil, 55 Rosa, 56 Edge, 53 Rydia (with Bahamut, Ifrit, Titan, Shiva, Ramuh, Dragon, Asura, Leviathan, Sylph, and Chocobo), and Kain level 58.
These stats were at the closest savepoint before going deeper where I fight enemies like Behemoth and Wicked Mask.