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Grindstone removes all enchantments except curses. - You get some of the XP back.
- It also resets an item's anvil repair cost.
Got a sword with junk enchantments, or an item that's "Too Expensive" in the anvil? The grindstone fixes both.
Removing enchantments
- Put the item in the grindstone.
- Take out the clean version.
- XP orbs pop out for some of the enchantments you removed.
Repairing
Put two of the same item in the grindstone. You get one item with both durabilities added, plus a 5% bonus. Enchantments are removed.
Resetting anvil costs
Every time you use an anvil on an item, its next repair costs more. A grindstone resets that penalty, so you can start fresh on an item that has become too expensive.
XP back
You usually get back between half and all of the enchantment levels you removed, as XP.
Cheat sheet
- Removes every enchantment except curses
- Gives some XP back
- Two items in = repair + 5%
- Resets anvil repair cost

How Nether Portal Linking Works
Why Your Anvil Says Too Expensive
Shulker Box Storage Maths