Unarmored Defense Expert (Charisma)

You have trained to fight unarmored. Choose one ability score of the following: Constitution, Wisdom or Charisma. You gain the following benefits:

• Increase the chosen ability score by 1, to a maximum of 20.

• While you aren't wearing armor or using a shield, you can calculate your AC as 10 + your Dexterity modifier + your chosen ability score modifier.