Lethal Dualist (5e Feat)
From D&D Wiki
You are a lethal with a weapon in each hand, able to strike with shear force with both weapons.
- When you engage in Two-Weapon Fighting, you can add your ability modifier to the damage of the second attack you make with a light weapon or non-light weapon with the feat Dual Wielder. If you have the Fighting Style: Two Weapon Fighting, you may now add your proficiency modifier to your damage while engaging in Two-Weapon Fighting
- When you engage in two-weapon fighting, your weapon attacks score a critical hit on a roll of 19 or 20.