Dual Weapons

Dual weapons allows a thief or a warrior to wield two weapons at a time in 
lieu of a shield. This effectively grants an extra attack with the secondary 
weapon, which hits at the same chance as the primary.

The classes that get the skill dual weapons are:

thief      : Level  40 (excellent)
warrior    : Level  60 (excellent)
darknight  : Level  45 (excellent)
assassin   : Level  35 (excellent)
ranger     : Level  75 (excellent)
paladin    : Level  45 (excellent)
swordsman  : Level  40 (excellent)
rogue      : Level  30 (excellent)