Four-Ways DogslicerWeapon 12
Source Pathfinder Advanced Player's Guide
Damage 1d6 Slashing
Type Martial
Price 1,700 gp
Weight light
This +2 striking dogslicer is obviously the work of a brilliant but scrappy artisan who valued versatility over safety. Four toothy gems line the blade's cutting edge, three of which glow-one with fiery red light, one with a chill blue, and one that gives off sparks-while the last is a glistening black. Each of these gems embodies a weapon property rune, but only one rune can be active at a time.
Activate 
Interact
Effect You twist the gem along the blade corresponding with the desired weapon rune: red for flaming, blue for frost, or yellow for shock. You take 1d6 damage of the type the chosen rune deals. You can instead twist the black gem to disable the active property rune, taking no damage.
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
AgileThe multiple attack penalty you take with this weapon on the second attack on your turn is -4 instead of -5, and -8 instead of -10 on the third and subsequent attacks in the turn.
BackstabberWhen you hit a flat-footed creature, this weapon deals 1 precision damage in addition to its normal damage. The precision damage increases to 2 if the weapon is a +3 weapon.
ColdEffects with this trait deal cold damage. Creatures with this trait have a connection to magical cold.
ElectricityEffects with this trait deal electricity damage. A creature with this trait has a magical connection to electricity.
EvocationEffects and magic items with this trait are associated with the evocation school of magic, typically involving energy and elemental forces.
FinesseYou can use your Dexterity modifier instead of your Strength modifier on attack rolls using this melee weapon. You still use your Strength modifier when calculating damage.
FireEffects with the fire trait deal fire damage or either conjure or manipulate fire. Those that manipulate fire have no effect in an area without fire. Creatures with this trait consist primarily of fire or have a magical connection to that element.
GoblinA creature with this trait can come from multiple tribes of creatures, including goblins, hobgoblins, and bugbears. 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.
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.