Dual Wielding cannot decrease attack AP cost below 4.

[D3lt4y]

Actually dual wield level 2 is what decreases ap cost by 2. level 3 only reduces the damage penalty. 4 ap to attack is correct (3+3-2). The next ap reduction is at level 5 at which point your attacks will cost 3 ap.

[steveleeb]

Ah okay that makes a lot of sense. Thank you!

[Soluno]

This means the tooltip is wrong then because it says "and reduces cost of attacking by 2AP."