The scenario:
You are playing a human fighter with a +1 Humanoid (Human) Bane Greatsword. A human bandit gets the jump on you and takes a swing, successfully sundering your greatsword and dealing 22 points of damage in a single blow.
The question: As the target of the weapon's bane is the one who sundered your weapon, does your weapon have the broken condition or not?
Assume the greatsword is made of steel. At full 'health' it normally has Hardness 12 and 20 HP (cause of the +1 enchantment).
Nothing about the bane quality prevents it from being broken, even by what it is a bane of. If the human sunders the sword, it is broken.
I'm more curious if the Bane quality kicks in and raises the enhancement bonus by 2 when the attack occurs, raising the hardness by the appropriate amount.
Ah, that is a much clearer question.
Hmm. Not entirely sure. It seems to appear like it might.
I would probably give the bonus on the CMB roll, but not on the damage against the weapon if you wear wielding a bane weapon against an opponent and tried to sunder their weapon.
Conversely, I wouldn't have the enhancement bonus count for the weapon's hardness or hp.
Bane: A bane weapon excels against certain foes. Against a designated foe, the weapon's enhancement bonus is +2 better than its actual bonus. It also deals an extra 2d6 points of damage against the foe. To randomly determine a weapon's designated foe, roll on the following table.
The bonus only applies against the appropriate type of foe. The actually enhancement isn't any better, it just works better against the appropriate creature type. It is mechanically represented by an increase in the effective enhancement bonus and the damage bonus.
Well, isn't it still against the designated foe, however? I mean, the same argument could be applied to Defiant.
My thought is that the increase in Hardness from enhancement bonus would apply, but the HP wouldn't (its there for that moment the attack, but then vanishes like an unconscious barbarian's bonus HP when there rage ends).
Not sure if that makes sense.
Except in rare circumstances (say, using a construct bane weapon to hit a construct that has hardness) I wouldn't apply the bane extra enhancement bonus to the item's hardness.