A Blacksmith's Whetstone is a currency item in Path of Exile that can be used to improve the quality of a weapon. Each whetstone applied to a weapon will increase its quality by up to 5% depending on its rarity 1. Blacksmith's Whetstones can be obtained from slain enemies or purchased from some vendors 1. For example, Greust in the Forest Encampment and Hargan in The Sarn Encampment (Act 3) and (Act 8) will sell a Blacksmith's Whetstone in exchange for three Armourer's Scraps. Blacksmith's Whetstones may also be obtained from Artisan's Strongboxes.
In Path of Exile, Blacksmith's Whetstones have the primary purpose of improving the quality of weapons. Here's what you can do with Blacksmith's Whetstones:
Improve Weapon Quality: Right-click on a Blacksmith's Whetstone in your inventory, then left-click on a weapon you want to enhance. Each Blacksmith's Whetstone used on a weapon increases its quality by 5%. The maximum quality improvement is 20. Improving weapon quality can enhance its damage, attack speed, and critical strike chance.
Trade: Blacksmith's Whetstones can be used as a form of POE currency. Many players are willing to trade them for other items or currencies, such as Chaos Orbs or other valuable crafting materials.
Convert to other Currency: Blacksmith's Whetstones can also be traded to vendors for other currency items. Exchanging a Blacksmith's Whetstone with a vendor can yield other crafting materials, such as Armourer's Scraps or Scroll Fragments.
Drops from Enemies: Blacksmith's Whetstones can drop as loot from slain monsters. The drop rate is relatively common, especially in areas with higher-level monsters.
Vendor Recipes: Certain vendor recipes can provide Blacksmith's Whetstones as a reward. For example, you can trade a full set of identified magic-rarity (blue) weapons with the same base type to a vendor for Blacksmith's Whetstones. The exact vendor recipes can vary and may depend on the current league mechanics or specific updates.
Quest Rewards: Some quests in Path of Exile offer Blacksmith's Whetstones as part of the rewards. Completing these quests will grant you a certain number of Blacksmith's Whetstones to use in your gameplay.
Strongboxes: Blacksmith's Whetstones can occasionally be found inside strongboxes, which are special chests that can contain various kinds of loot and modifiers. Opening strongboxes can yield Blacksmith's Whetstones along with other currency items.
Trade: As with many other items in the game, you can trade with other players to obtain Blacksmith's Whetstones. Some players may have excess Blacksmith's Whetstones and are willing to trade them for other items or currency.
20% Quality Weapon Recipe: You can trade a full set of identified rare (yellow) weapons with at least 20% total quality to any vendor. In return, you will receive a Blacksmith's Whetstone. A full set of identified rare weapons consists of one weapon of each type: one-handed sword, two-handed sword, one-handed axe, two-handed axe, one-handed mace, two-handed mace, bow, claw, dagger, and staff.
40% Quality Weapon Recipe: If you have a full set of identified rare weapons with a combined total of at least 40% quality, you can trade it to any vendor for two Blacksmith's Whetstones.
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