Most things that add damage in this game are limited to one hit per successful attack. Wookiee Rage doesn't specify this. It says:

Wookiee Rage: When a Wookiee has suffered any wounds, he deals +1 damage to Brawl and Melee attacks. When a Wookiee is Critically Injured, he instead deals +2 damage to Brawl and Melee attacks.

This matters to me because we have a Wookiee Marauder using a pair of vibroknives, so he could potentially get the damage bonus twice if it is not limited to one hit per successful attack.

RAW, it would seem like all attacks based off brawn would get the bonus. Maybe the balance is in requiring wounds to get the bonus started?

If the vibro knives attack with one dice pool I would say it is one attack and thus one damage bonus. If the Wookiee rolls two or more dice pools each is seep rat attack, thus multiple damage bonuses.

I'd probably be open to test it applied to both attacks, but the conventions of this game seems to indicate that it would only apply to one attack. It's either 2 or 4 more damage per round, given success and enough advantages. It's not necessarily game breaking in itself, but considering the other talents and abilities that apply to damage I'm leaning towards a limitation to 1 hit per successful attack. If not the wookiee could easily, with brawn 4, vibroknives and applied to both hits, deal 9x2 damage with 1 success and 2 advantages, ignoring 2 soak per hit (I believe vibroknives have pierce 2?). That is pretty beard.

If the vibro knives attack with one dice pool I would say it is one attack and thus one damage bonus. If the Wookiee rolls two or more dice pools each is seep rat attack, thus multiple damage bonuses.

I second this.

The rules normally only allow for a single Action (Attack) in combat, Two Weapon Combat (pg210-11)

is a way to get around this limit by combining two Attacks into a single Combined Check. A Combined check is now a single Action (Attack) with the extra damage from the second weapon being activated by Advantages or a Triumph so you'd apply the +1 Damage once. If the Rage Condition said +1 Damage per Hit then I would say you added the +1 twice.

Since the rules don't specify that it doesn't*, I'm inclined to say it would apply to each hit.

Applying Wookiee rage to vibro-knives or even vibroswords (which I thought were one-handed also?) dual-wielded is very different from Deadly Accuracy for Ranged (Heavy) applied to a Heavy Blaster Rifle with Autofire. The former adds up to two damage to one additional attack, whereas the latter adds up to five damage to what could be two or more additional attacks.

*Please don't argue with me the merits of whether or not, in the absence of a specified ruling, the allowance of something should be in the positive or the negative. In other words, whether or not you should read the rules as "if they don't say you can, you can't" or "if they don't say you can't, you can." Both arguments are ridiculous, and reductio ad absurdum arguments can be applied either way. Rules interpretation must be taken on a case-by-case basis.

In this case, I don't see why it wouldn't apply. Different rules specify that some other damage bonuses are not added per hit, and I think it more reasonable to assume that the designers could have included a specification that the damage was only once per attack than to assume that all cases of damage follow the existing pattern. Why should they not have written a rule specifying that additional sources of damage were never applied to more than one hit, if that was their intent?

Since the rules don't specify that it doesn't*, I'm inclined to say it would apply to each hit.

Well the RAW does specify Attack and not Hit, and since Two-Weapon Combat is a single combined Attack with extra damage activated by Advantages it kinda does specify that the bonus damage should be only applied once.

Since the rules don't specify that it doesn't*, I'm inclined to say it would apply to each hit.

Well the RAW does specify Attack and not Hit, and since Two-Weapon Combat is a single combined Attack with extra damage activated by Advantages it kinda does specify that the bonus damage should be only applied once.

It doesn't specify anything. Damage only applies to hits, not attacks. Attacks can miss. The question remains whether or not it applies to only one hit of the attack, or to all hits of the attack.

Since the Wookiee has to have either taken damage (not exactly a laughing matter in this game) or be suffering from a Critical Injury in order to trigger the damage bonus, to say nothing of the bonus only being applied to melee attacks (which are fairly substandard unless the PC is in a specific specialization), I'd say let the damage bonus apply to each hit.

The talents that apply a bonus to damage (Point Blank, Barrage, and Furious Strength) make it plan that those talents only apply to a single hit in an attack. As the Wookiee rage doesn't have that notation, I'd say let him apply that +1 or +2 bonus to each hit he can score with those vibroknives. Given he's already using a sub-par melee weapon choice (in terms of raw damage output, vibro-ax offers more bang for the buck since there's no difficulty increase or Advantage requirement to get the extra damage), I'd be willing to cut the player a bit of slack for going with a pretty cool concept of a double-knife wielding Wookiee.

I don't mean to derail the thread but here is the other issue, at least for our game. The PCs rarely heal up to full between encounters and natural healing can take awhile. that means that wookiee is a walking rage machine while he is suffering wounds. Meaning, it is somewhat in the interest of the wookiee to never be at full wounds since they gain extra damage.

Since the rules don't specify that it doesn't*, I'm inclined to say it would apply to each hit.

Well the RAW does specify Attack and not Hit, and since Two-Weapon Combat is a single combined Attack with extra damage activated by Advantages it kinda does specify that the bonus damage should be only applied once.

It doesn't specify anything. Damage only applies to hits, not attacks. Attacks can miss. The question remains whether or not it applies to only one hit of the attack, or to all hits of the attack.

Again, it says Attack not Hit. Two Weapon Combat is a single Attack. It seems pretty plain to me.

So if someone has modded a pair of pistols to increase base damage on both guns how would that be different from the wookie getting a boost on both hits?

Since the rules don't specify that it doesn't*, I'm inclined to say it would apply to each hit.

Well the RAW does specify Attack and not Hit, and since Two-Weapon Combat is a single combined Attack with extra damage activated by Advantages it kinda does specify that the bonus damage should be only applied once.

It doesn't specify anything. Damage only applies to hits, not attacks. Attacks can miss. The question remains whether or not it applies to only one hit of the attack, or to all hits of the attack.

Again, it says Attack not Hit. Two Weapon Combat is a single Attack. It seems pretty plain to me.

Actually it says attack(s) not attack, as in plural., if we are being precise of course.