Synthesist Multiclass bab

[pipedreamsam]

I was reading the huge synthesist summon thread and after awhile I did not find the answer to this particular question so I just stopped. If this question has already been addressed and answered my apologies in advance.

Does the bab from the synthesist (whilst in eidolon form) and the bab from other classes stack?

Base attack bonus:

A base attack bonus is an attack roll bonus derived from character class and level or creature type and Hit Dice (or combination's thereof). Base attack bonuses increase at different rates for different character classes and creature types. A second attack is gained when a base attack bonus reaches +6, a third with a base attack bonus of +11 or higher, and a fourth with a base attack bonus of +16 or higher. Base attack bonuses gained from different sources, such as when a character is a multiclass character, stack.

Synthesist text I am referring to:

While fused with his eidolon, the synthesist uses the eidolon’s physical ability scores (Strength, Dexterity, and Constitution), but retains his own mental ability scores (Intelligence, Wisdom, and Charisma). The synthesist gains the eidolon’s hit points as temporary hit points. When these hit points reach 0, the eidolon is sent back to its home plane. The synthesist uses the eidolon’s base attack bonus, and gains the eidolon’s armor and natural armor bonuses and modifiers to ability scores. The synthesist also gains access to the eidolon’s special abilities and the eidolon’s evolutions. The synthesist is still limited to the eidolon’s maximum number of natural attacks. The eidolon has no skills or feats of its own. The eidolon must be at least the same size as the synthesist.

[kyrt-ryder]

It's in the FAQ, I don't feel like looking it up right now, but yes it does. It works the same way Flurry BAB does (meaning it only counts for the class that grants it, other classes are added to it normally.)

A Synthesist 1, Fighter 19 has BAB 19 normally and BAB 20 fused.

[pipedreamsam]

kyrt-ryder wrote:

It's in the FAQ, I don't feel like looking it up right now, but yes it does. It works the same way Flurry BAB does (meaning it only counts for the class that grants it, other classes are added to it normally.)

A Synthesist 1, Fighter 19 has BAB 19 normally and BAB 20 fused.

Thank you so much, finally a way to make a viable summoner/dragon disciple.

[kyrt-ryder]

I wouldn't necessarily say that... Dragon Disciple isn't advancing your evolutions and Summoner Spells aren't very well oriented to the typical Dragon Disciple style...

Well, yeah, it's probably viable... on the weak end I'd guess.

[tryyshokk]

Sorry to reanimate this thread, but does anyone have a link to this faq? I can't seem to find it.

[Melkiador]

https://paizo.com/paizo/faq/v5748nruor1fz#v5748eaic9obc

Quote:

The synthesist uses the eidolon's Hit Dice for the effects of evolutions, not his summoner Hit Dice or his total Hit Dice.

When fused, use the eidolon's BAB instead of the summoner's class BAB, and add in BAB from other sources as normal. For example, a fighter 19/summoner 1 normally has a total BAB of +19 (+19 from fighter, +0 from summoner), and when fused with his eidolon this increases to +20 (+19 from fighter, +1 from the 1st-level eidolon).