Martial Arts Master (5e Feat)

Prerequisites: Wisdom 13 or higher
A wise old master has taught you mastery of martial arts. You gain the following benefits:

When you take the Attack action on your turn to attack with an unarmed strike or a simple weapon, you can use your bonus action to make one additional unarmed strike.

You can roll a d4 in place of the normal damage of your unarmed strikes. This die changes to 1d6 at 5th level, 1d8 at 11th level and 1d10 at 17th level.

You can use your Wisdom modifier, instead of your Dexterity, to calculate your AC.