Did you lose the first time you attempted the final battle?

[NINJA_Ryu]

I didn't know I was suppose to use the Crystal the first time I was facing Zeromus. :rolleyes2

i didnt catch on after i used bahamut twice

even then, rosa and ydia died, for less than 2000 hp.

cystal sword? never heard such a think..but i have some gengi, excalibue, and other weapons you find in the final dungeon.