Bonk Master

You have mastered utilizing your weapon to apply concussive blows. You gain the following benefits:

• When you take the Attack action and attack with only a maul, warhammer, flail, mace, morningstar, or light hammer you can use a bonus action to make a debilitating melee attack. This attack uses the same ability modifier as the primary attack.
• When you make an attack in this way, until the start of your next turn, you may choose to either knock the creature prone or inflict the blinded and deafened conditions.