Great Weapon Master

You have learned to use the weight of heavy weapons to your advantage. You gain the following benefits:

• If you reduce a creature to 0 hit points or deal a critical hit with a Heavy weapon, you can make a single weapon attack as a Bonus Action.
• When you make a melee weapon attack with a Heavy weapon, you can take a -5 penalty to the attack roll, but you gain a bonus to the damage equal to double your Strength modifier.