ShiftingEquipment 6
Source Pathfinder Core Rulebook
Price 225 gp
Weight negligible
With a moment of manipulation, you can shift this weapon into a different weapon with a similar form.
Activate 
Interact
Effect The weapon takes the shape of another melee weapon that requires the same number of hands to wield. The weapon's runes and any precious material it's made of apply to the weapon's new shape. Any property runes that can't apply to the new form are suppressed until the item takes a shape to which they can apply.
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.
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.
TransmutationEffects and magic items with this trait are associated with the transmutation school of magic, typically changing something's form.