Improved Medium Armor Master

You have practiced moving in medium armor to gain the following benefits:

• Addition: Increase your Strength or Dexterity
  score by 1, to a maximum of 20.
• Addition: You gain proficiency with medium
  armor and shields.
• Wearing medium armor doesn’t impose
  disadvantage on your Dexterity (Stealth)
  checks.
• When you wear medium armor, you can add 3,
  rather than 2, to your AC if you have a
  Dexterity of 16 or higher.