Hello,
I've only started playing for a few months now and I'm learning as I go and I'm sorry to do this but I been combing the messageboards for this answer and either I'm not using the correct search tags or I some how missed it because it is a specific question.
From what I understand with TWF (Two-weapon fighting), when you weld a weapon in your off-hand (off hand left arm), you incur a penalty to your attack rolls.
Now, here is where I can't find my answer.
With the two-weapon fighting feat (or not), is the off-hand attack roll using your highest BAB and then calculated with the TWF penalty?
Example:
Joe is a lvl 3 fighter, he is choosing to use Kukri's in both his hands and has the two-weapon fighting feat. His BAB currently according to the table is +3.
He declares a full round attack action while welding these two kukri'.
His penalty to TWF is -2 to all his attack rolls because he is using a light weapon off hand.
now is it:
Scenario 1:
Joe's attacks - +1/-2 (+1 Primary / -2 Offhand)
Primary calculated +1 [Result = +3 BAB - 2]
Off hand calculated -2 [Result = 0 BAB - 2]
OR
Scenario 2:
Joe's attacks - +1/+1 (+1 Primary / +1 Offhand)
Primary calculated +1 [Result = +3 BAB - 2]
Off hand calculated +1 [Result = +3 BAB - 2]
Why do I ask this? Because I had player (brother) who is playing monk ask me questions about their flurry of blows.
At level 1 monk, his FoB is -1/-1.
The only conclusion I could think of why it is -1/-1 is because the table is ALREADY calculating the -2 penalty to the FoB (Flurry of Blows) with his monk level being his BAB. AND because it is his right hand and his left hand to calculate similar to two-weapon fighting.
Level 1 monk FoB BAB is = +1
FoB works like TWF (but really isn't TWF per reading it) so incurs a -2 penalty.
Result level 1 FoB: -1/-1 [+1 BAB - 2]
So what I need to know is.
For Joe (and possibly the monk player) is clarification on what scenario is it?
If it is Scenario 2, and it is indeed using your highest BAB (and maybe I'm not completely understanding terminology) from your off-hand attack roll calculation then where is it in the rule book or reference for that to show a GM for both cases of argument?
I could point to the Monk FoB table and its rules on use for Joe and his TWF but I'm still not clear on where this rule is for Two-weapon fighting after combing the rule book, feats and the messageboards.
Is the off-hand using no BAB (+0 BAB) or your main highest BAB to calculate your attack rolls for TWF for penalties?
Again, I apologize if this has been answered before.
EDIT: Fixed a math error in calculation.
If I've read this right, scenario 2 is the answer, but the rules are spread around a little.
The most important one is actually that your melee attack bonus is BAB + Str mod + Size mod + other modifiers.
That's the bonus you always use. (Exception: so-called iterative attacks from high BAB apply a modifier to the second and subsequent attacks, and extra attacks from improved and greater two-weapon fighting. Don't worry about those yet.)
So, from that bonus you apply the two weapon fighting modifiers (they're part of the "other modifiers" bit).
For the love of god, allow the Monk player to use the Unchained Monk instead.
An easy way to think of it is, when using a light weapon and having the Two Weapon Fight, Improved TWF, and Greater TWF feats each pair of your attacks should have the same to hit bonus, not accounting for differences in weapon enhancement or other things that would affect only 1 attack/hand.
However, FOB is (as you noted) not TWF. The penalties for it are already included in the table. That's why at level 20 the BAB listed for FOB is 18. It's also important to note that with FOB, you only use one weapon not two. So while you can describe it as punching with multiple fists, it isn't actually necessary. For instance a monk could instead flurry with a single temple sword (and they can even two-hand it for bonus power attack damage if they choose to use that feat. However strength damage is always set at 1x because FOB says so specifically.)