Hi Griffith,
So here is what the wiki says:
Eypharians have also emphasized dual wielding in their culture. For an Eypharian, dual wielding is achieved when they can manipulate both sides of their bodies at the same time. The skill is not acquired limb by limb, but side by side. Since Eypharians are accustomed to using four to six limbs at once in everyday endeavors, they are not limited in the same way two-armed creatures are. Like any practitioner of Dual wielding, though, they must work towards dexterity. A human uses both arms in conjunction, but it does not make him an immediate master in Dual wielding.
What it means in practice is you learn in sides and then refine per arm. For the sake of illustration, let's say it's a four armed Eypharian we're dealing with.
The Eypharian starts with two daggers on his dominant side (let's say his right). However, they tend to move in unison. In the next level (dual wielding) you add daggers to the other side. The left side's limbs will move in unison with one another, but in contrast with the right side's limbs. In the upper levels, an Eypharian begins to refine his craft, so limbs on the same side can now move as if independent of one another. A fully trained Eypharian can have all limbs moving with elegance and grace on their own path.
I will try to clear this up in the wiki. I hope that makes sense. Bottom line: certain races have gifts/perks due to their anatomy this is one of the perks of being an Eypharian.