Overkill

You get the ability to dual wield martial weapons and use them in dual weapon fighting. 

• You can use a martial weapon in each hand
• If wielding versatile weapons you can not use the damage dice from holding the weapon two handed
• If you have a Strength score higher than 20 you ignore the above point and can now use this feat with two heavy/two-handed weapons as well

The weapon attack you make with the second weapon does not add the proficiency bonus to the damage roll unless you have the two-weapon fighting style.

You can also not use this feat with ranged weapons.