Essence at [unixtime wrote:1084470294[/unixtime]]I entirely disagree. It's perfectly viable for Wizards to retain a low BAB and Fighters to retain no spell advancement -- if the aquisition of a 3/4 BAB and a 1/2 spell advancement can be made as powerful as a 1 BAB or a 1 spell advancement individually.
Other than just being generally disagreeable, why even post that?
Do you have some method by which fighter levels and wizard levels can synergize while still having all of your wizard levels stop advancing if you take a fighter level
and have all of your fighter abilties stop advancing if you take a wizard level?
I'm just thinking of basic power dynamics.
If you start at level 1 with a level of Fighter or a level of Wizard, you have some amount of power. Let's assume for the sake of argument that we've figured out some killer app by which they are perfectly balanced.
Now, if you take another level of the same class, you get some amount of bonus power from the second level, the abilities you got from the first level, however, also improve. If you take a level of the other class, you get the same benefit as taking the first level, but your other level doesn't improve.
This is doable, each level could improve the other levels somewhat an give diminishing returns for itself. That is, the first level could provide power of X + y, and the second level could improve the first level's abilities by y and add only X power itself, for a total power of 2X + 2y. Then if you multiclassed, neither level would be improved by the other, but you'd be getting X + y power off of both, for a total power level of 2X + 2y either way.
But imagine if you took a third level... it's going to improve
both of your similar levels if you have them, and only
one of your similar levels if you multiclassed.
To keep things balanced over 20 levels, each first level would have to provide as much benefit all by itself as a 20th level in a class provides to all 19 previous levels in the same class. That is, level 1 Fighter would have to provide as much benefit as adding a 20th caster level does to all 19 caster levels worth of spell slots for a 20th level character.
And yet, if that were the case, a triple classed character of 18/1/1 would end up larger than a 20th level character of a single class.
I don't think it's doable. If you can come up with some incredibly weird power growth pattern in which you can add dicontinuous beginnings of the progression or continue to stack legos on to the end - then you are the mack daddy of math and I bow to you.
As is, the only progressions I can come up with which are fiar are:
True Linear. No abilities in class synergize
at all, and each character is just 20 separate abilties which are each valued at face value.
True Stacking. All abilities synergize, and each character is 20 abilities all scaled up to 20th level in either quadratic or exponential form.
Neither of these allows for taking a Wizard level to improve your previous Wizard abilities if taking a Fighter level doesn't. It has to be neither or both, I can't see it working any other way.
-Username17