Elemental Whetstones

Sharpened by the Elements. You can use an elemental whetstone to imbue slashing or piercing weapons with elemental properties. You can use an action to use the whetstone on one melee weapon or piece of ammunition that deals Piercing or Slashing damage. For the next minute, the weapon has elemental properties and deals additional damage on a successful hit. The properties, type of damage and amount of damage, depends on the specific whetstone you used. Whetstones have a limited amount of uses and weapons can only be empowered using a specific elemental whetstone once per day.