jeffh said:
Any special reason for those numbers?
I'm guessing BAB, as the save progressions are either full, one-half, or three-quarter -- which makes classes with multiple of 4 levels the only classes that doesn't screw the BAB progression of the poor souls that have not seen the Glorious Light of fractionnal progression.
But I'm going to correct Nifft here, the ideal number of level is 12 or 24. Because of the saves. They're either 1/2 +2, or 1/3. So if you want perfect progressions for both BABs and saves, you need to have multiple of the smallest common denominator to 4 (for BAB), 2 (BAB and saves), and 3 (saves). That's 12, 24, 36, 48, etc.
That said, I didn't voted for 48 as the perfect number of levels for PrC. I like 3-level PrC the best.
My reasonning is that a PrC is just a few special abilities that only a select few
prestigious organizations (guilds, sects, agencies...) teach. Not a whole different path. The character's base classes are still more important. Furthermore, given that usually one need to be at the very least 5th level to qualify, that makes a 10-level PrC one that require at least one 15th-level NPC at the head of the guild/sect/agency. I want to avoid having too many NPCs above level 8.