Well-Armed Feat 5
Source Pathfinder Book of the Dead
Your detachable limbs offer flexibility. You Interact to remove your arm and wield it in the other one, increasing your reach by 5 feet for any one-handed weapon held in that arm. If your next action is a Strike with that weapon, creatures that were outside your reach that you can now hit are Flat-Footed against your first attack. You don't have a free hand while holding the arm. You can Interact to reattach the arm while holding it.
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.
SkeletonThis undead is made by animating a dead creature's skeleton with negative energy. An ability with this trait can be used or selected only by skeletons.