Really need some clarification from others than my GM on my Brawler

[Alesander]

Hi.

My character:

Brawler 2 lvl's
Sorcere 4 lvl's
Bloodline: Orc

Feats of importance:
Improved natural attack

Spell: Enlarge Person

So first of all. And Im sure this has been asked before, but I could not find a clear answer.

Does Improved natural Attack increase my damage on my my Melee strikes.
(Now i think it should, except for Brawlers Flurry, which as with Flurry of blows stats that it does not work with natural attacks.)

Second.
I have normaly now with Improved Natural Attack
1d8 damge, and when i add Enlarg Person it goes to 3d6 in pcgen.
And not to 2d6. Is this correct?

[Blake's Tiger]

Unarmed Attacks do not qualify for Improved Natural Attack.

If you were an Orc with the Toothy alternate racial feature, you could use Improved Natural Attack on that (or claws or tail or gore, etc).

If, for whatever reason, you have an attack that does 1d8 damage and are then enlarged, it does 2d6 damage. I'm not sure where you're getting 3d6 (1d12 and 2d6 increase to 3d6).

[JohnHawkins]

Your GM is right.
Unarmed strikes are not natural attacks, you would not get iterative attacks with a natural attack.

[Casual Viking]

Improved Unarmed Strike specifically can't be used with unarmed strikes.

[Divvox2]

Unfortunately your gm is correct regarding the feat. Concerning your second question, I'll refer you to the following FAQ...

If your base is 1d8, then enlarged it would indeed be 2d6, as any form of enlargement increases the damage dice 2 steps. However, as you (legally) only do 1d6, your enlarged damage die is 1d10.

If you are looking for additional means of increasing your damage die, there are two methods as far as I can recall at the moment.
1) Wand of Lead Blades - since your unarmed attacks count as manufactured weapons, this works. However, it's a self-only spell, so you have to be able to cast it from a wand yourself.
2) Gravity Clips - from the new technology guide this item has 10 charges and is effectively Lead Blades, the electronic version. It does take an action to activate them.

Note: These two do not stack per the FAQ directly under the one I linked.

CRB FAQ wrote:

As per the rules on size changes, size changes do not stack, so if you have multiple size changing effects (for instance an effect that increases your size by one step and another that increases your size by two steps), only the largest applies. The same is true of effective size increases (which includes “deal damage as if they were one size category larger than they actually are,” “your damage die type increases by one step,” and similar language). They don’t stack with each other, just take the biggest one. However, you can have one of each and they do work together (for example, enlarge person increasing your actual size to Large and a bashing shield increasing your shield’s effective size by two steps, for a total of 2d6 damage).

[JohnHawkins]

Monk's robe will also effectively increase your unarmed damage