Great Weapon Initiate

You are learning to put the weight of a weapon to your advantage, letting its momentum empower your strikes. Selecting this feat gives you the following benefits:

• You may make a weapon attack as a bonus action when, on your turn, when you drop creature's hit points to 1 or lower with a melee weapon.  
• When you use a heavy weapon you are proficient with to a melee attack, you can choose to take a minus 2 penalty to the attack roll. If that attack hits, you add 5 to the attack's damage.