Hammering Blows

You pummel your opponent with furious attacks that hit harder with each strike. You gain the following benefits:

• You increase your Strength or Constitution score by 1, up to a maximum of 20.
• Your unarmed strikes can deal bludgeoning damage equal to 1d6 plus your Strength modifier.
• Whenever you hit a creature with an unarmed strike, you can add an additional weapon damage die of the same type to the damage roll for each time you previously hit that creature with an unarmed strike this turn (For example, the first hit against a creature would deal 1d6+Str, and a second hit against that same creature would deal 2d6+Str, 3d6+Str for a third, and so on).