hahaaha, truely are one of the funniest peopel I have seen Templar (in a good way, that wasn't a sarcastic remark)
Well, HP spheres are easier to get and use than Luck Spheres.
Mainly because you only get 2 luck spheres from Greater Sphere and 2 fortune spheres from EArth Eater.
Not to mention overdrives don't work too well with Earth Eater. It's basically quick hits all the way.
I just realised I didn't say anything about luck in the first post. Anyway, all it does is raise the chance of evasion and accuracy and critical hit ratio.
...which I guess is rather good.
And what's this??? You're taking on the Dark Aeons and don't need luck??? Have fun with Mindy. Or, in the overall view of things, Penance.
btw, I faced Mindy and Cindy simultaneously and beat them no sweat.