Great Weapon Master

You’ve learned to put the weight of a weapon to your advantage, letting its momentum empower your strikes. You gain the following benefits:

On Your Turn, when you score a critical hit with a melee weapon or reduce a creature to 0 Hit Points with one, you can make one melee weapon Attack as a Bonus Action.
Before you make a melee Attack with a heavy weapon that you are proficient with, you can choose to take a -5 penalty to the at⁠tack roll. If the atta⁠ck hits, you add +10 to the attack’s damage.