Unconventional Expertise Feat 13
Source Pathfinder Core Rulebook
Prerequisites Unconventional Weaponry, trained in the weapon you chose for Unconventional Weaponry
You've continued to advance your powers using your unconventional weapon. Whenever you gain a class feature that grants you expert or greater proficiency in certain weapons, you also gain that proficiency in the weapon you chose for Unconventional Weaponry.
Traits
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.
HumanA creature with this trait is a member of the human ancestry. Humans are a diverse array of people known for their adaptability. An ability with this trait can be used or selected only by humans.