2+ pairs of hands and 2+ 2-handed weapons

[Astral Wanderer]

You have a Kasatha PC with his four hands and the Multiweapon Fighting feat (monster feat), and he wants to use a two-handed weapon as his primary weapon, and two one-handed (or light) ones in the other two hands.
Would you give him more penalties to hit? How much, and to what (all attacks, just the primary, or just the off-hands)? And what if the primary weapon isn't a two-handed weapon but a one-handed used with two hands to apply 1-1/2 Str?
Further, he wants to wield two two-handed weapons, or two one-handed weapons used with two hands each. Other than penalties to hit, how do you treat the Str bonus for the second weapon? Normal Str (which is halfway between the off-hand's 1/2 Str and the two-handed 1-1/2 Str)?

[Lou Diamond]

James Jacobs told me on his thread that the rules system would have to be redesigned to support 4 armed pc's as I wanted to port over a race from another system.

[kestral287]

Personally, I would apply standard Two-Weapon Fighting rules. -2 to all attacks for the first example, -4 to all attacks for the second. Off-hand attack in the first example, 1.5x str to the primary two-handed weapon, .5x str to the two off-hand weapons. Second example, 1.5x Str to each. But that's me.

There are no official rules on the subject.

[Nefreet]

There are no "official rules". You'll have to invent your own.

As advice, though, since a two-handed weapon requires a main hand and an off-hand, and kasathas still only have one main hand (and 3 off-hands), I don't think two weapon fighting with Greatswords would be possible.

But that's just me.

[KahnyaGnorc]

I think you should add the modifiers to your Strength bonus together to get the modifier:

Main-hand(MH) = 1x
Off-hand(OH) = 0.5x
MH + OH = 1.5x
OH + OH = 1x

Kasatha wielding a weapon in each hand = 1x + 3* 0.5x (A total of 2.5x)
Kasatha wielding 2 2h weapons = 1.5x + 1x (A total of 2.5x)

In addition, this would also affect Power Attack (1x gets 2 damage per -1 Attack, just like a one-handed weapon)

That, however, would be a house-rule.

[Caliban_]

Just use a two-handed weapon and dual wield a pair of light weapons.

[CraziFuzzy]

I don't see how, physically, you'd be able to wield two two handed weapons, without them getting in the way of each other. So I'd agree with the player doing example 1, and treat them as such:

MH+OH -> Great Sword -> 1.5x strength
OH -> Short Sword -> 0.5x strength (1.0x STR with Double Slice)
OH -> Short Sword -> 0.5x strength (1.0x STR with Double Slice)

Use the attack modifiers for normal two (multi) weapon fighting, with the feat, off-hand light (so -2 all around).

Improved Two-Weapon would grant a second attack for each short sword, Greater Two-Weapon would provide a third attack for each short sword.
Two Weapon Rend would trigger if the main and either off hand weapon hit.

[CraziFuzzy]

I wonder, however, if it might be more advantageous to wield a shield in one of those off hands.

[Kazaan]

If you had the capacity to adequately and mechanically wield a 2-h weapon as an off-hand, it would get 1x Str to damage because, using Pathfinder math, 1.5x (2-h factor) + 0.5x (off-hand factor) = 1x. You can also easily understand this by looking at the balance of Str bonus; when using normal, two-armed TWF, you get 1x on your main-hand and 0.5x on your off-hand. Using a 2-h weapon, the bottom line is that you just add those together and get a 1.5x factor. Well, for a 4-armed race, using two 0.5x off-hands to wield a single weapon, they add up to 1.0x.

[wraithstrike]

There are no rules for twf'ing two handed weapons so either it is against the rules or a GM has to decide for himself until the PDT issues a ruling.

The rules as written only cover one-handed and light weapons, or at the least weapons used in one hand.