The character sheet shows two numbers under the damage heading: primary and secondary. However it seems that what the secondary damage is is not explained anywhere, or at least I could not find it. Logically is that the damage the you deal with your off-hand, but it is not clear how often is it dealt comparing to the primary, how it relates to recovery and if it has a percentage that it's being reduced by (like in WoW) so that you are not twice as dangerous if you have two weapons….
So how does secondary damage work?
Best Answer
Secondary Damage is definitely your off-hand weapon's damage range. There are a few things to note about how Dual Weilding works in Pillars of Eternity. Should be noted that there are a lot of different stats, talents, etc that can effect some of the more specific numbers used as examples below.
Example of 1-Hand Weapon fighting. (Average speed weapon)
1s Attack (animation), 1s Recovery, 1s Recovery (3 second cycle)
Example of Dual-Weilding weapon fighting. (Average speed weapons)
1s Primary Attack (animation), 1s Recovery, 1s Secondary Attack, 1s Recovery
Other Notes:
The offset is that you actually get an accuracy boost for having a single weapon for not being able to attack as quickly as you can with dual weapons.
Because "Recovery" stat is so important, it is important to note that for each Damage Reduction (DR) your armor has your recovery time is decreased by 5%. So Scale Armor, which has DR 7, gives you a -35% Recovery detriment.