Granite dust is dropped by the Grotesque Guardians that can be found on the Slayer Tower's rooftop.
With 50 Smithing, they can be used on cannonballs to create granite cannonballs, which increases the max hit of the dwarf multicannon from 30 to 35. No Smithing experience is granted for doing so.
When a player creates granite cannonballs, a message in the chatbox will state You apply a thick coating of granite dust to your cannonballs.
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