Dual Wield

Dual Wield is an ability exclusive to Ninjas in Final Fantasy XI. They gain this ability at level 10. It allows the ninja to wield a one handed weapon in each hand. Ninjas can use a select few Great Katanas as well, but it is almost never done since they are so much more effective with two weapons.

For Ninjas, this means they can basically use single handed Katanas, some western style swords, and daggers. A lot of players choose to use ninja as a subjob. This is especially true of thieves, rangers, and warriors.