Sollir Furryfoot
Explorer
I don't think uniformity is necessarily a good idea. For instance, a black mage's 2nd level spells wouldn't necessarily cost as much as a blue mage's 2nd level spells. Some 2nd level spells are more powerful or just plain more useful than others.
However, if you could determine a spell's MP cost through factors, similar to determining the Spellcraft DC of an epic spell, I think that would be a good idea.
In an ideal system, spells that are more powerful or more useful than others in its same level is bumped up to a level where it's more appropriate

That being said, I vote for a uniform MP system. With the current die-system, I would suggest 3 MP per spell level -1 (2 for 1st level spells, 5 for 2nd, 8 for 3rd, 11 for 4th, 14 -5th, 17 -6th, 20- 7th, 23-8th, 26-9th).
A 20th level black mage will have 20d12 MP, and assuming he has about a 16 in wis that adds 60 and will be able to cast about 7 of his highest level spells if he decides to use that.
It's cost is just a bit higher than the psions formula (2x spell level -1) because mages in the FF system didn't seem to cast those 9th level spells often. Perhaps even consider raising the cost to 4xspell level -1 if we include items that restore MP in the game.
I would keep Wis as the only stat that adds to MP, since it does that and Will saves and not anything else really in my proposed system (While Int would add to spells known and Cha to DCs). I suggest a feat that increases a spellcaster's MP, maybe by an amount equal to their level or equal to their level/2 (and retroactively increases) each time taken, as well as a feat for HP that's similar to that but stronger than toughness.
I also suggest that almost every class gets a few bonus feats every X levels (my Blue Mage core class right up has some every 4 levels) with their own class lists for bonus feats (including metamagic feats).
I also suggest not having any cantrips, it doesn't fit the FF flavor.
All of this, is, of course, IMO
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