[B]
Raising HP/MP quickly
Tired of beating the crap out of your party members? Don' like raising Magic levels so you can blow through your MP faster, so you can get more MP? One spell will fix it all: Swap. This spell switches the HP/MP of the caster with its target. Used on a low level enemy like a Goblin and you'll find your HP reduced to 6HP and 0MP like that. It will usually raise one of the two stats every time its used (just make sure the character who uses the spell doesn't get any HP/MP restored after using it in battle, it only counts based on how much they lose in when the battle is over).
How do you get this little spell. Well its in Mysidia, which is a location you won't be visiting until the second half of the game. Though it is possibly to go there early if you have the Canoe (which you get very early in the game). Baiscally take the river heading South from Fynn all the way south until you reach the mouth of the river, from there head west from the river and immediately south from there hugging the eastern edge of the map. You will come across a huge lake you can use the canoe on and on the southern side is a forest, Mysidia is in the southeastern part of these woods. Here you can get tons of powerful gear and high level spells but if you only want Swap cause you don't want to grind for gil to get the rest of the gear, you will need 24,000 gil to purchase three scrolls.
BEWARE as expected, this area is swarming with high level monsters that will murder you instantly if you are low level so you may want to wait until you acquire mythril gear (or Golden Armors from the Soldiers in Fynn) and raise your stats significantly. If you plan on fighting, I suggest raising Bare-handed and any elemental Magic spells or instant death spells like Warp and Banish, cause you will not have access to weapons that will do great damage to these creatures until much later when you naturally go to this location. Bare-Handed is not affected by this stigma and all non-instant death spells should be used on single targets for better use. Also, save after every encounter you survive or flee from. After you get the goods, return to Altair and let the magic swapping begin.