Crystal knife

The crystal knife is a degradeable knife that is made by Crystal Singing with a crystal tool seed and 500 harmonic dust. This requires 80 Smithing and gives 500 Smithing experience. Alternatively, you can pay Ilfeen or Eluned 1,000,000 coins to turn a crystal tool seed into a crystal knife, without any harmonic dust or 80 Smithing.

The knife has two effects: it gives a 5% chance of getting double arrow shafts from fletching Logs, and it gives a 5% chance of giving a strung bow instead of an unstrung bow when Fletching unstrung bows. The knife will do this 28 times before degrading back to a crystal tool seed. The tool seed can be recharged by Ilfeen or Eluned for a cost that starts at 1,000,000 coins but decreases the more times you've done it. You can also talk to Ilfeen and Eluned if you want to turn your knife back into a seed.

Like the other crystal tools, the tinderbox doubles the chance of getting Fletching golden rocks and strange rocks from Shattered Heart.