In World of Warcraft, the stats of one-handed weapons are half those of two-handed weapons to balance dual wield.
You might wonder what the advantage of using dual wield is.
The advantage is for classes that proc with auto attack (rogue, warrior fury, etc.), because the attack speed of one-handed weapons is higher.
In Ragnarok, dual wield is balanced by reducing the damage of the secondary weapon. I believe this approach, while easier to configure, is imperfect because it gives too much advantage in stat accumulation.
This is a good way to START balancing, since warrior and rogue are far ahead right now.
But there's still the problem of cards. Just to give an example, a rogue can use 8 bonus cards against elements. If both weapons are +5, that's an 80% bonus.
This is very balanced, and I haven't come up with an idea for how to solve this problem.
Suggestions?