The blacksmith can forge a magic rod that massively increase your M.Att at the cost that you can't use charge magic (but you're at perma 2x M.att just about), it comes with a swirly icon spell that decrease enemy att and M.att if I remembered right. Also grab the three elemental rod from blacksmith that gives you the 25MP single target elemental attack, and grab the three elemental booster from the shop in first town. With that selection of skills and equipping the M. att rod should let you beat the game.
There's also a holy booster and holy rod you can add to your arsenal (unlocks L40 i think?), but I find I only really used the three main 25MP elemental skill with their respective booster. All the other higher level unlocked stuff I never bothered or needed to try like the wind and earth rods ...etc.