The Witcher
Grindstone is a blade enhancement that increases damage inflicted by 20% and may be used on either silver or steel blades.
The Witcher 3: Wild Hunt
Grindstones (or sharpening stones) is no longer an inventory item but instead an enhancement gained by interacting with a grindstone in the game and increases the power of your weapon by 20% for 15 minute.
They can typically be found in an area where there are blacksmiths or armorers, but the presence of these craftsmen is not strictly necessary. In the Hearts of Stone expansion, players can apply the "Preservation" runewords from the Runewright near Upper Mill, far northeast of Novigrad. This will enable both the grindstone and armorer's table's bonuses to be made permanent.
In the Blood and Wine expansion, you can purchase a grindstone for Corvo Bianco at the cost of 1,000 
.
Description
- Workbenches and sharpening stones can be found next to some smiths. You can use these to provide temporary boosts to their effectiveness. Workbenches and sharpening stones are indicated on your maps once you pass near them. This is where to go to get a boost before a tough fight.
Locations
White Orchard
Velen and Novigrad
- Lindenvale
- Crow's Perch
- Lornruk
- Blackbough
- Claywich
- Oreton
- Midcopse
- Boatyard north of Condyle
- Toderas
- Mulbrydale
- Ursten
- Northwest of Hierarch Square
- Oxenfurt Harbor
Skellige
- Kaer Trolde
- Sawmill northeast of Rannvaig
- Arinbjorn
- Kaer Muire
- Svorlag
- Urialla Harbor
- Larvik
- Isolated Hut
- Harviken
Kaer Morhen
- Three in the main keep
Toussaint
- Corvo Bianco (after purchase)
- Tulasens Caves
- Vermentino Vineyard
- Tourney Grounds
- Northeast of the Nilfgaardian Embassy
- Francollarts
- Ardaiso Quarry
- Mont Crane Castle
- Trading Post
- Arthach Palace Ruins