While most of us possess two hands, some more than that,
we are usually more skilled at using one than the other.
In many cases, the offhand is only a spectator while the other
hand performs most duties. The same applies to wielding weapons,
our primary hand is much more adept when using weapons. Through
rigorous training, one can become skilled enough to use weapons
in their offhand(s). If you are really good, you can probably
hide that you have an offhand at all.
Negate offhand penalty is available in the following guilds: