
Wisper |

Ok, I have a four armed Eidolon who cares two greatswords. He has two-weapon fighting and is proficient with the swords. On hand on each side of his body is a primary hand. Would there be any penalties or would it be like a normal person carrying one great sword. Right now we are giving him a -2 for both swords just because we are not sure.

concerro |

There is a chart in the combat chapter in the Two-weapon Fighting section.
You take the worse penalties on that chart unless you take TWF(the feat).
You can not attack with both ends of both staves. The staff would take the same penalties as the greatsword.
The stuff below the dotted line is not covered by the rules. It is just a best guess because this situation has yet to be covered by any rules that exist.
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The twf rules assume an off-hand attack with 1/2 str damage, but swinging with two hands assumes 1.5 str. Some GM adjudication is needed here unless a rules quote can be found.
I would allow 1.5 str for the main hand, and 1/2 of that for the off-hands.

Paladin of Baha-who? |
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A creature with more than 2 arms takes multiweapon fighting rather than two-weapon fighting. This explains how fighting with more than one hand works. Only one hand is considered primary. All secondary hands take the same penalty. If the creature has multiweapon fighting, the penalty is reduced. A creature fighting with a non-light weapon in its off-hands would take a -4 to both primary and secondary attacks. A creature with only light weapons in its secondary hands would take -2 to both. Now, if one of the weapons is a two-handed sword, obviously that's not a light weapon. A quarterstaff, on the other hand, is a double weapon, for which the second attack is treated as a light weapon.
The rules are somewhat ambiguous, but it appears to me to be this way: A double weapon such as a quarterstaff, when used to make two attacks, is wielded as if both ends of it are a light weapon. Therefore, the penalty for wielding two quarterstaves is -2/-2/-2/-2 if they are used for two attacks each. If both quarterstaves are used to strike two-handed as if a single two-handed weapon, giving 1.5*STR modifier to damage, then the one being used in the offhands is not being used as a light weapon and the penalty becomes -4 to both quarterstaves.
If two two-handed swords are used, there is no option to use them as light weapons and the -4/-4 penalty automatically applies. Damage bonus is a little ambiguous again but it would appear that for the sword being wielded by the primary hand and one offhand, the usual two-handed bonus of 1.5*STR applies, and for the sword being wielded by two offhands, the 0.5*STR bonus for offhand and the 1.5*STR bonus for being wielded two-handed would both apply, resulting in 0.75*STR bonus.
If using a two-handed sword and light weapons in each offhand other than the one being used to wield the sword, the -2 penalty would apply to each weapon.
This seems to me to be the most straightforward interpretation of the rules for this situation.

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The rules are somewhat ambiguous, but it appears to me to be this way: A double weapon such as a quarterstaff, when used to make two attacks, is wielded as if both ends of it are a light weapon. Therefore, the penalty for wielding two quarterstaves is -2/-2/-2/-2 if they are used for two attacks each.
This part is wrong
Double Weapons: Dire fails[...] A character can fight with both ends of a double weapon as if fighting with two weapons, but he incurs all penalties associated with two weapon combat, just as though the character were wielding a one-handed weapon and a light weapon
multi weapon fighting with two quarterstaves would have a penalty of -4/-4/-4/-4
As far as damage goes with the original post (four arms with two greatswords) i'd rule that the 'main' greatsword gets x1.5 str and the 'offhand' greatsword gets x1 str
--The Reasoning--
Due to the reason we only have the numbers 1.5, 1 and .5 for the different handiness of weapons and not how/why these numbers were chosen, so I can only guess how/why they were chosen. My guess is simply that your main hand gives x1 strength and your offhand(s) give x.5 strength, hence two handing a weapon gives you 1.5 strength. So in the example of two great swords being held in two hands each the 'main' great sword gets x1.5 strength (main hand + off hand = 1 + .5 = 1.5) and the 'offhand' great sword gets x1 strength (off hand + off hand =.5 + .5 = 1)

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OK in my case, my summoner is a Synthisis and his Eidolon doesn't have feats. It uses the summoners feats. So now do I use TWF or MWF?
Since an Eidolon can take monster feats, I'd say your summoner can also take them since he fulfills the prerequisites when the eidolon is summoned. I would say he should take MWF, but he would get no benefit from it when the eidolon isn't summoned.

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Wisper wrote:OK in my case, my summoner is a Synthisis and his Eidolon doesn't have feats. It uses the summoners feats. So now do I use TWF or MWF?Since an Eidolon can take monster feats, I'd say your summoner can also take them since he fulfills the prerequisites when the eidolon is summoned. I would say he should take MWF, but he would get no benefit from it when the eidolon isn't summoned.
Since you're a synthesist i'll assume that you're relying on your eidolon's dex to qualify for TWF/MWF, if this is the case there is no reason not to go MWF. If your dex on it's own doesn't qualify you for TWF then that too will 'fall off' when you don't have the eidolon up.