Improved Unarmed Strike

Your martial studies give you mastery of combat styles that use unarmed strikes. You gain the following benefits when you make an unarmed strike:

• You can use Dexterity instead of Strength for the attack and damage rolls of your unarmed strikes.
• You can roll a d4 in place of the normal damage of your unarmed strike. This increases to a d6 (5th level), to a d8 (11th level), and finally a d10 (17th level).
• When you use the Attack action with an unarmed strike on your turn, you can make one unarmed strike as a bonus action.