Check out the p99 wiki on
dual wield.
Summary:
1. Low delay in offhand to skill up DW quickly
2. Weapon swings are independent, off-hand is not held up by the primary weapon.
3. The off-hand does not get a damage bonus so put your best ratio weapon in your primary hand.
4. Get as lower delay on your primary weapon as possible to take advantage of more damage bonus (without sacrificing ratio)
5. To skill up 1HS/1HB/Piercing quickly, put the weapon in main hand (unstated, but obvious).
You can also check out the
Game Mechanics page on the wiki if your want blood coming out of your eyeballs
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