Sword and Dagger

You use a finesse weapon in one hand and a smaller weapon in the other:

• Increase your Dexterity or Charisma by 1, to a maximum of 20.
• When you take the Attack action and attack with a finesse melee weapon that you're holding in one hand, you can use a bonus action to attack with a different light melee weapon that you're holding in the other hand. 
• When you score a critical hit with an attack made with a finesse melee weapon during an Attack action, any attack made with a light melee weapon during a bonus action on the same target is a critical hit.