In ff3 aero and stone spells were actually white magic nukes so its not like they are breaking a trend by giving CNj offensive magic. At level 12 you don't need to be casting AoE's things die pretty fast. You shouldn't think of blizzard 2 as an AoE offensive really, think of it as similar to CNJ's fluid aura, a quick get away when mobs crowd you. At level 18 you get fire 2 which damages your target and all nearby targets to it so tell your friend to wait for fire 2.