The Sharpening Station is a furniture item that, when placed and pressed ⚷ Open / Activate on, applies the Sharpenedbuff, which increases armor penetration of all melee weapons by 12 / 4. This lasts for 10 minutes, but can be canceled at any time by right-clicking the icon (), by selecting the icon and canceling it in the equipment menu (), or by double-tapping the buff icon ().
The armor penetration bonus also applies to damage done by summoned minions, but only while the user is holding a melee weapon. It also applies to projectiles fired from magic and ranged weapons, however, it only applies to the projectiles when you are holding a melee weapon after having shot the projectiles already making it not suitable for practical use.
Unlike the Crystal Ball, The buff structure for Mages, the Sharpening Station cannot be used for crafting. This may mean those with a use for items crafted with a Crystal ball will need to purchase both a Sharpening Station and Crystal ball (despite potentially not needing the buff it grants), unless one is found in an Underground Cabin.
The Sharpening Station is the only one of the four class furniture buff items that cannot be purchased.