The barbarian class receives a new feature in this section.

Whirling Blades

5th-level barbarian feature

While engaging in two-weapon fighting, when you take the attack action, you can make one additional attack with one of the weapons you hold; you can’t take a bonus action to make an attack this turn.

In addition, while holding a one-handed weapon in each hand, you can take a bonus action to attack with one of them during you turn when you don’t take the Attack or Dodge action.