Medium Armor Master

Source: Player’s Handbook (2024) p. 205

Prerequisite: 4th, Proficiency with medium armor

You gain the following benefits.

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

Dexterous Wearer. While you’re wearing Medium armor, you can add 3, rather than 2 to your AC if you have a Dexterity score of 16 or higher.