Twining StaffWeapon 6
Source Pathfinder Core Rulebook
Damage 1d4 Bludgeoning
Type Simple
Price 250 gp
Weight negligible
Appearing to be just a small, flat disc made of twigs, this item can grow and shrink.
Activate 
Interact
Effect You cause the twigs to rapidly grow or contract, reshaping into a +1 striking staff, a +1 striking bo staff, or its disc form. In its disc form, it has negligible Bulk and must be held in one hand to be activated. In the other forms, it has the same Bulk as a normal weapon of its type. You can switch your grip as part of the activation.
When you expand the item, you can use the force of the expansion to High Jump or to try to Force Open a door or the like by wedging the disc into a gap before activation. The staff makes the Athletics check with a 1d20+15 modifier.
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.
TwoHandThis weapon can be wielded with two hands. Doing so changes its weapon damage die to the indicated value. This change applies to all the weapon's damage dice, such as those from striking runes.