A lot of people have expressed that it would really suck not to be able to pull off those crazy spells BLU is known for. At the same time, though, if a BLU can just use those all the time they sort of lose their impact or otherwise be seriously broken. With that in mind I had something of an idea for a mechanic that could help tie things together for a balanced version of BLU.
Indulge me by engaging in some class fantasy:
As a user of blue magic, you wield a highly unique set of spells. Cherry-picking the best from your foes and wielding them as your own source of strength, you chain them together in ways other mages wouldn’t dream of. By applying a Blue Mage's intuition and ingenuity, you combine those seemingly disparate pieces into an art, a sum greater than the whole of its parts. FFXIV's blue magic synergies foreshadow a much greater sense of cohesion between blue magic spells that only a master can see: applying the innovative spirit of the Spoken to the curious magicks of nature itself, you can engineer the abilities never meant for man and use them better than even the beasts you learned them from. Through clever modifications of the underlying aetheric manipulation, you can ignore the costs of inefficient spells, cast lengthy incantations in a flash, and shrug off the side effects of reckless magic.
To give the gist first, my idea is basically this: a Blue Mage can have access to an array of extra powerful Blue Magic without necessarily having it be practical to use all the time.
Put heavy costs on those spells (high MP costs, severe cast times, or drawback side effects ala Moon Flute or Overheat) while making them very powerful. Naturally it's going to be no fun if you don't get to mix those spells into your combat style, so we have a mechanic: try to get around the limitations of those spells. I envision this working by using other blue magic to build toward one of three metamagicks: Focus, Haste, or Wisdom. The Focus metamagick lowers the MP cost of your next blue magic spell by a large percentage. The Haste metamagick cuts cast times to a quarter (or some other fraction). Finally, the Wisdom metamagick prevents the “recoil” effects of spells from going off.
By utilizing the right blue magic in succession or pulling off spell combos, you can fish for certain metamagick procs and use them for those spells that, while strong, might not be the most efficient use of your resources otherwise. I’m hoping this could be a nice way to include powerful, memorable versions of such spells such as White Wind, Mighty Guard (if it functioned more like a defensive cooldown than a tank stance), Beta, Trine and so on without letting it become overbearingly powerful.
I also think this would be a neat sort of parallel to the Red Mage: where the Red Mage uses very measured, efficient spells to make the most of their own aether, the Blue Mage could embrace the quirks of nature’s magic and work around them.