Two handed weapons, Two weapon fighting, and a unique racial item

[Undone]

Armor Spikes:

Spoiler:

Can I use two-weapon fighting to make an "off-hand" attack with my armor spikes in the same round I use a two-handed weapon?
No.
Likewise, you couldn't use an armored gauntlet to do so, as you are using both of your hands to wield your two-handed weapon, therefore your off-hand is unavailable to make any attacks.

Helmet, Dwarven Boulder:

Spoiler:

This heavy, reinforced helmet can be used to make melee attacks. The wearer may also use the helmet when attempting bull rush maneuvers, granting a +2 circumstance bonus on the check, but after completing the maneuver (whether successful or not), the wearer is staggered until the end of his next turn. In addition, the helmet grants a +2 circumstance bonus to the wearer's AC against critical hit confirmation rolls. A dwarven boulder helmet adds 20% to the wearer's arcane spell failure chance. It occupies the head slot and is made of metal, not stone, meaning that it can be crafted from unusual materials as a metal weapon. A dwarven boulder helmet can be enchanted as a weapon (not as armor, despite providing some protection).

Can you THF and TWF at the same time as a dwarf?

I don't think you can I just wanted to check.

[Chess Pwn]

NO. If you are using both of your hands to wield a weapon your "off-hand" is unavailable to make any attacks.

[Eridan]

With manufactured weapons you have a number of attacks per round depending on your BAB. The TWF path gives you extra attacks, THF gives you more damage on your attacks.

The whole 'offhand' rules are confusing and resulting in alot of questions on the boards.

Keep it short and simple:

Attacks per round : depends on BAB
TWF attacks per round : depends on BAB + 1 (Prerequisite: two readied light or one-handed weapons)

[blackbloodtroll]

You will need a Barbazu Beard, or Sea-Knife.

You could still wield a two-handed reach weapon, and a Dwarven Boulder Helmet, but just not attack with both during the full-attack action to two-weapon fight.

[Avadriel]

It used to be accepted as common sense that armor spikes could be used with a two handed weapon for two weapon fighting, though a number of people didn't like it. The following FAQ link is relevant to preventing that http://paizo.com/paizo/faq/v5748nruor1fm#v5748eaic9shq

That FAQ has two ways it has been interpreted, the more common one is for people to incorrectly assume that people have metaphysical hands and if you use both of them for a two handed attack, you cannot use them to make an off hand attack even if you have another weapon. In my opinion, this is the wrong interpretation of the FAQ, as it specifically mentions armor spikes and gauntlets, the real point of the FAQ seems to be that armor spikes regardless of where they are on your armor, require a free hand to use, (sadly this means that you once again need improved unarmed strike to knee someone in the groin).

What this means is that any weapon that expressly does not require a hand to wield, such as a boot knife, an unarmed strike, a dwarven boulder helm, or a barbezu beard, or something else, then for now at least, you can rules as written two weapon fight with it. There is one developer who doesn't like being able to do that though, so it may change.

[BadBird]

It's interesting that the much-maligned Armor Spikes FAQ - and it was an FAQ specifically about Armor Spikes rather than TWF/THW - was blanket-interpreted to be a ban on TWF/THW, when you could just as easily read it as saying 'Armor spikes are wielded in an actual hand.' I mean, they specifically compare it to an armored gauntlet. The phrase '...your offhand is unavailable' could literally mean the hand, rather than the abstract 'off hand attack'.

The barbazu beard already seems to suggest that if you don't have a "hands" problem, then you don't have a problem; is it unreasonable to assume that this exception is general? Anyhow, the consensus or groupthink or whatever seems to have spoken - and so a lot of people just ignore the ruling anyways.

[Chess Pwn]

So are you saying that the Channel energy guide was only for channel energy? that it can't be applied to other situations that are similar? You're saying that when they said "as you are using both of your hands to wield your two-handed weapon, therefore your off-hand is unavailable to make any attacks."

They didn't actually mean "since you used two hands already you have no off-hand". That they meant, forget this, armor spikes use an actual hand to wield. And I can multiweapon fight, I'll just use my two-handed, and blade boot, and kick and kick, and knee, and etc. And who cares about penalties, I'll get a nat 20 eventually.