Superior rock-crushing scrimshaw

The Superior Rock-crushing Scrimshaw is an item that can be made within a players' port workshop at level 85 Fletching once all four scroll fragments of Rock Crushing have been retrieved from the Player-owned port minigame. This item will last 4 hours after which the player will need to make a new one.

When equipped, it offers a chance to crush the ore (losing it in the process) in exchange for increased experience while Mining.