infinity ring is useless so far, it says it can remove the cap of the damage you can do, but you won't reach damage cap even if you play as a certain very OP character in route B and reach 999 in both physical and magical attack power. the god hand iirc, is to hugely boost your physical attack power, but greatly reduce your HP and your SP will become 0, so only normal attacks available, it's not worth the risk, you will die in 2 hits from enemies, and the damage boost is not that high to let you quickly melt bosses, my advice, do not buy them. Once you reach a certain point in both routes, you won't need these trash gears