Originally Posted by
KoShiatar ^ Is there any spell who is really worth leveling up besides Cure and elemental black magics?
Holy is great if you want to grind Soul for Cure whilst still causing damage. Osmose is also uber for later dungeons since it allows you to regain massive amounts of MP quickly. Also Esuna, Basuna, Aura, Wall, Barrier and Dispel need to be levelled to at least level 6 to be wholly effective. Berserk and Haste can make your physical attackers absolutely monsters. Blink levelled enough can make your party immune to physical attacks if you don't want to use Shields/don't have enough Agility.