Goblin Weapon Familiarity Feat 1
Others might look upon them with disdain, but you know that the weapons of your people are as effective as they are sharp. You gain access to all uncommon weapons with the goblin trait. You have familiarity with weapons with the goblin trait—for the purposes of proficiency, you treat any of these that are martial weapons as simple weapons and any that are advanced weapons as martial weapons.
At 5th level, whenever you get a critical hit with one of these weapons, you get its critical specialization effect.
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.
GoblinA creature with this trait is a small, frantic goblinoid. Goblins tend to have darkvision. An ability with this trait can be used or chosen only by goblins. A weapon with this trait is created and used by goblins.