Do Base Attack Bonuses and Fort,Ref and Will saves stack when multclassing?

[DNDfan]

This is quite a simple question but I’m unsure since I haven’t multiclassed before. I was wondering for example if you were to create a character that has taken 5 levels in gunslinger and 6 levels in fighter what would the base attack bonus be? A level 5 gunslinger has BAB +5 at level 5, whilst a level 6 fighter has BAB +6/+1. Do the highest (full BAB) combine so the character has +11/+1 or do you add the +5 to both the other BAB to get +11/+6. Or perhaps does this mean that a 5th level gunslinger and 6th level fighter has three attacks at BAB +11/+5/+1? I suppose this question also applied to saves. So, a 5th level gunslinger has base saves +4 Fort ,+4 Ref,+1 Will whilst a 6th level fighter has saves +5 Fort, +2 Ref, +2 Will. Would these base saves combine to give +9 Fort, +6 Ref and +3 Will before other modifiers? Thanks in advance.

[Falcar]

Yes, when you multiclass you add them together. A character with fighter 6 and gunslinger 5 has a Base attach bonus of 11/6/1. The saves also stack (before ability scores) fort: 9, Ref: 5, will: 2. Normally multicassed character ends up with better saves, the things that do not stack are class features unless they say they do. Levels of fighter will not increase your deeds that rely on level, and gunslinger won't advance weapon training/armor training/bravery.

[Gallant Armor]

For BAB you would add the BAB from both classes, at level 11 BAB would be +11. Iterative attacks work off of BAB irrespective of multiclassing resulting in +11/+6/+1.

Saves would be combined as you indicated.

[Balkoth]

They stack. 11 BAB means +11/+6/+1. Same thing for saves.

Some things do not stack, like Channel Energy from different classes.

[Cantriped]

If your GM is using the Fractional Attack Bonus & Saving Throw Progression (from Pathfinder Unchained) you don't gain a saving throw advantage from Multiclassing, but neither do you suffer a BAB disadvantage from having odd numbers of levels of non-martial classes.

[DNDfan]

Thank you for your responses but I'm still a bit confused, for which I apologise. To clarify, for example if I was playing a character which had 6 levels in Fighter and 4 levels in the prestige class Stalwart Defender, and their BABs were +6/+1 and +4 respectively, would their overall BABs in a full attack action be +10/+5/+1 or would they be +10/+4/+1?

[Chemlak]

Only ever look at the first number for each class. So you have +6 and +4, which is +10, and that results in +10/+5.

[Blymurkla]

Cantriped wrote:

If your GM is using the Fractional Attack Bonus & Saving Throw Progression (from Pathfinder Unchained) you don't gain a saving throw advantage from Multiclassing, but neither do you suffer a BAB disadvantage from having odd numbers of levels of non-martial classes.

I'm a big fan of Fractional Base Bonuses so I thought I'd link to it on the PRD.

For you, DNDFan, Fractional Base Bonuses are a bit complicated at first, but offers smoother multiclassing. With normal multiclassing, weak saves tend to get even weaker and your base attack bonus is gimped if you take 1/2 or 3/4 BAB classes. On the other hand, strong saves might sky-rocket (which might lend itself to certain builds, but I think those are rather cheesy). If you want, you could ask your GM to use Fractional Base Bonuses. It's not strictly necessary to enforce this alternate rules system game-wide, one character might use Fractional while another might use the normal system.

Let's look at your Gunslinger 5/Fighter 6 with Fractional Base Bonuses:

Five levels of Gunslinger gives you BAB +5, Fort +2-½, Ref +2-½ and Will +1-⅔. Fort and Ref are good saves for Gunslingers.

Six levels of Fighter gives you BAB +6, Fort +3, Ref +2 and Will +2. Fort are good saves for Fighters.

If we combine these, including adding 2 to any save that's a good save for at least one class, we get BAB +11, Fort +7-½, Ref +6-½, Will +3-⅔.

In play you don't care about the fractions. Those only matter when you gain new levels.

You might notice this line is strictly worse than a normal multiclass, with +7 Fort instead of +9. But next level, say you take Fighter for Gunslinger 5/Fighter 7, you'll get another ⅓ on your Will save for a total of +4. A normal multiclass would still be on +3. And I'd wager it's more important to shore up your weak save, compared to the normal multiclass that strengthens a save that's already sufficiently strong for you.