Before you make a melee attack with the attack action with a weapon that doesn't a have heavy property that you are proficient with, an unarmed strike, or an improvised weapon that you are proficient with, you may choose to take a -5 penalty to the attack roll. If the attack hits you add +10 to the attacks damage. When you score a chital hit with a melee attack or reduce a creature to 0 Hit Points with an attack, you have adv. on the next attack you make until the end of your next turn.