You gain the following benefits.

Ability Score Increase: Increase your Strength or Dexterity score by 1, to a maximum of 20.

Light Hands: Your hands are now considered Light weapons.

My Body Is The Weapon: Your unarmed strikes acquire mastery properties. You can access those properties even if you don’t have the Weapon Mastery Feature. Your hands acquire the Nick property, and your legs the Topple property. As long as you are not wielding any other weapons or a shield, you are considered to have both your hands and legs equipped.

Grappling Defense: You have advantage on rolls to avoid or end the Grappled condition on yourself.