It takes gobs of experience to throw a fifth level spell, and how annoying is it when you cast, say, a magic jar against some very low-level character and have it thrown off with the same chance of throwing off a charm person spell. Shouldn't the spell that takes longer to acquire have more oomph than a spell you have at the start?
What's worse is that by the time a party member is likely to use a magic jar against an enemy, the enemies will be much more powerful and have much lower saving throws than when that mage was first level and using charm person vs. orcs. Not that I'm saying I want to make higher level spellcasters more powerful, but we're talking a circumstance of diminishing returns for more difficult to acquire spells ... and the effect is to push casters away from spells that require saving throws.
Logically, a higher level spell ought to be tougher to save against than a lower level spell. Logically, a player ought to improve their saving throw at every level. So I'm proposing, as a template, a table something like this:
For comparison's sake, if we propose that a first level character's save vs. a particular type of attack (magic, death, paralyzation and so on) is 13 (marked in red), than the additional saving throws decending from that initial number is reflected by the table.
Of course, this would mean a separate table for each class and each type of attack ... but hey, I work on a computer, so I have the space. Overall, I think this would make a better saving throw 'experience.'
