Medium Armor Master

Prerequisite

Medium armor proficiency

Ability Score Increase

None

Source

PHB

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

• 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.