You master fighting with two weapons drawn spinning with the speed and ferocity of a dust devil, gaining the following benefits:

• If you are not wearing armour or carrying a shield, you gain a bonus to AC equal to one tenth your distance moved until the begging of your next turn.
• If you hit with an attack action while you are wielding a separate melee weapon in each hand, you may make a free attack with your off-hand weapon against the same target. 
• You can draw or stow two one-handed weapons when you would normally be able to draw or stow only one.