med stud said:
Well its true that you get x2 Str total but OTOH your damage output is lowered by 10 % due to the -2/-2 and you lose out on all situations where you only have one attack compared to the twohanded weapon wielders. Add to this that you have to take 3 feats during your characters career and that you have to have high Dex is the reason why Im thinking this over. Doing some basic number-crunching I concluded that two weapon wielders do more damage than twohanded weapon wielders on full attacks but that they lose out on single attacks and due to the fact that they will have to have two magical weapons instead of one.
Don't listen to these other posters. They didn't crunch any numbers. This is not unbalancing, in fact it's not balancing enough. It balances out two weapon fighters with two handed weapon fighters only slightly.
18 Str Fighter, Weapon Specialization: +2 D8 Longsword and Shield
18 Str Fighter, Weapon Specialization: +2 D8 Longsword and +2 D6 Shortsword
18 Str Fighter, Weapon Specialization: +2 2D6 Greatsword
To hit chance 50%, 6th level Fighter (i.e. two attacks per round), since all weapons are 19-20/x2, I didn't bother to calculate criticals since the damage ratio does not change:
Normal Single Attack:
Longsword and Shield: 6.25 (12.5 * 50%)
Longsword and Shortsword: 6.25 (12.5 * 50%)
Greatsword: 8.5 (17 * 50%)
Normal Full Round Attack:
Longsword and Shield: 9.375 (12.5 * 50% + 12.5 * 25%)
Longsword and Shortsword: 9.875 (12.5 * 40% + 12.5 * 15% + 7.5 * 40%)
Greatsword: 12.75 (17 * 50% + 17 * 25%)
Revised Full Round Attack:
Longsword and Shortsword: 10.675 (12.5 * 40% + 12.5 * 15% + 9.5 * 40%)
The two weapon combo does not even do more damage in a full round attack compared with the two handed weapon unless you need to roll a 20 to hit. Even if you take an extra feat and use a Bastard sword in your primary hand and you use your house rule, the Greatsword still does more damage per round.
If you really want to balance out two handed weapon fighting with two weapon fighting, get rid of the -2/-2 penalty AND allow for normal strength on the off hand weapon (or, just get rid of the -2/-2 penalty with the TWF feat and keep strength as is, or make the penalty -5/-5).
Longsword and Shortsword: 11.500 (12.5 * 45% + 12.5 * 20% + 7.5 * 45%)
Longsword and Shortsword: 12.400 (12.5 * 45% + 12.5 * 20% + 9.5 * 45%)
Longsword and Shortsword: 13.125 (12.5 * 50% + 12.5 * 25% + 7.5 * 50%)
Longsword and Shortsword: 14.125 (12.5 * 50% + 12.5 * 25% + 9.5 * 50%)
In the case of getting rid of the -2/-2 penalty (regardless of whether you maintain original strength for the offhand weapon or not), the two weapon combo does slightly more damage in full round attack situations, the two handed weapon does slightly more damage in single round attack situations (except in the case of Power Attack when the two handed weapon STILL does more damage in both situations).
Remember, no matter what you do (out of the ones above), the two handed weapon will always average more overall damage because it does significantly more damage in Attack of Opportunity situations as well.