Medium Armor Expertise (Inventor) Feature 11
You've learned to defend yourself better against attacks. Your proficiency ranks for light armor, medium armor, and unarmored defense increase to expert.
If you have a medium or heavy armor innovation, you gain access to the critical specialization effect with your armor innovation.
Traits
Common
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.