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I am confused about how two weapon fighting (2WF) style adds up with a high BaB (I.E. one that already gives you extra attack.)
So basicaly 2WF feat give you an extra attack at -2/-2 using your full BaB?
IMP. 2WF gives you an extra off hand at -5?
Greater 2WF hives you a final extra off hand attack at -10?
The only thing that confuse me is with how to "add it up" to a high BaB (more than one base attack).
If you only had a BaB of +10 that would give +8/+8/+5/+0 with Greater 2WF right?
For simple exemple lets take a fighter with no bonus at all but only with his BaB fighting with two weapons. Of course off hand is light!
If i'm correct it should go like this:
Fighter level 5 with 2WF feat (BaB +5) = +3/+3
Fighter level 6 with 2WF feat (BaB +6/+1) = +4/+4/-1
Fighter level 7 with IMP. 2WF feat (BaB +7/+2) = +5/+5/+0/-5
Fighter level 11 with Greater 2WF feat (BaB +11/+6/+1) = +9/+9/+4/-1/-6
Am i correct?
P.S. I know it might be a confusing post but thats the whole point!.. i am confused ;()

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You can't get Greater TWF until BAB +11, so I'll use that as my example.
BAB +11, TWF, Improved TWF, Greater TWF:
Iterative attacks (just using raw BAB without modifiers)
+11, +6, +1
TWF gives you one off-hand attack at +11
Improved TWF gives you one (extra) off-hand attack (at BAB -5=) +6
Greater TWF gives you one extra attack at BAB -10= +1
So, main weapon +11, +6, +1
Off-hand weapon at +11, +6, +1
These are just the raw BAB numbers. Then you add all your usual bonuses, with a penalty of -4 on each attack, which becomes -2 if your off-hand weapon is light.
Does this help?

Grick |
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So basicaly 2WF feat give you an extra attack at -2/-2 using your full BaB?
Two-Weapon Fighting is a style of combat that grants you one extra attack during a full-attack action. When you fight this way, you're locked into a format of main-hand and off-hand attacks. Your main-hand is normal in every way, it's exactly like if you made a full-attack and took whatever attacks you could normally take. Your off-hand is limited to only the extra attack granted by the Two-Weapon Fighting style.
When you're using this style, you take penalties on your attack rolls. These penalties are modified based on what type of weapon you're using in your off-hand, as well as by the Two-Weapon Fighting feat.
If your BAB is +10, then normally when you make a full-attack, you can make two attacks total. One at +10, and one at +5.
If you use Two-Weapon Fighting, you make those same attacks, but they're both made with your main-hand. You then make one attack with your off-hand at +10. When you're calculating your total attack bonus for each of those attacks, be sure to include the penalties from Two-Weapon Fighting.
IMP. 2WF gives you an extra off hand at -5?
Greater 2WF hives you a final extra off hand attack at -10?
Yes.
When ITWF grants you a second off-hand attack, it's at the exact same bonus as the first one, but with an extra -5 penalty.
When GTWF grants you a third off-hand attack, it's at the exact same bonus as the first one, but with an extra -10 penalty.
For simple exemple lets take a fighter with no bonus at all but only with his BaB fighting with two weapons. Of course off hand is light!
If i'm correct it should go like this:
Fighter level 5 with 2WF feat (BaB +5) = +3/+3
Fighter level 6 with 2WF feat (BaB +6/+1) = +4/+4/-1
Correct so far.
Fighter level 7 with IMP. 2WF feat (BaB +7/+2) = +5/+5/+0/-5
No, you've doubled a penalty in there.
Main hand: +5/+0
Off-hand: +5/+0
The first attack with either hand is at full BAB (+7) with a -2 penalty. The second attack is at BAB-5 (+2) with a -2 penalty.
Fighter level 11 with Greater 2WF feat (BaB +11/+6/+1) = +9/+9/+4/-1/-6
Main hand: +9/+4/-1
Off-hand: +9/+4/-1The first attack with either hand is at full BAB (+11) with a -2 penalty from two-weapon fighting. His second attack is at BAB-5 (+6) also with a -2 penalty. His third attack is at BAB-10 (+1) with a -2 penalty.

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So if i follow you Grick our level 11 fighter would have 6 attack per full round, 3 with each hand?
If that's the case then i still don't get the math you came up with.
Maybe i should approach the problem from a different angle and let's take our level 11 fighter with a light off hand weapon:
Base attack bonus with 1 weapon: +11/+6/+1 with "main hand"
1 extra "off-hand" attack with 2WF (all at -2): +9/+4/-1 "main hand" + 1 "off-hand" attack at +9
1 second extra "off-hand" attack with I2WF (base off hand -5): +9/+4/-1 with "main hand" + 2 "off-hand" attack at +9/+4
Finally 1 last extra "off-hand" attack with G2WF (base off hand -10): +9/+4/-1 with "main hand" + 3 "off-hand" attack at +9/+4/-1
Am i correct?

Grick |

So if i follow you Grick our level 11 fighter would have 6 attack per full round, 3 with each hand?
Yes. +11/+6/+1 normal 'iterative' attacks due to high BAB. This is your main-hand.
You get one attack with your off-hand from using the two-weapon fighting combat style. You get a second off-hand attack from Improved Two-Weapon Fighting feat. You get a third off-hand attack from Greater Two-Weapon Fighting feat.
Your first off-hand attack is at full BAB.
Your second off-hand attack is at full BAB, -5. (Granted by ITWF)
Your third off-hand attack is at full BAB, -10. (Granted by GTWF)
Every one of those attacks, both main-hand attacks and off-hand attacks suffer a -2 penalty (assuming you have the Two-Weapon Fighting feat and are using a light weapon in your off-hand).
Base attack bonus with 1 weapon: +11/+6/+1 with "main hand"
1 extra "off-hand" attack with 2WF (all at -2): +9/+4/-1 "main hand" + 1 "off-hand" attack at +9
1 second extra "off-hand" attack with I2WF (base off hand -5): +9/+4/-1 with "main hand" + 2 "off-hand" attack at +9/+4
Finally 1 last extra "off-hand" attack with G2WF (base off hand -10): +9/+4/-1 with "main hand" + 3 "off-hand" attack at +9/+4/-1
Am i correct?
That looks correct, and also looks to match what I said.
Main hand: +9/+4/-1
Off-hand: +9/+4/-1