Steel incendiary cannonball (OSRS): Ammo suited for a boat's cannon. Current price 720 gp, 1+ verified trades on PriceCheck.gg.
Steel incendiary cannonballs are items that can be fired from a cannon during boat combat . They deal the same amount of damage as steel cannonballs , and apply burn to the target as well. Two are made per action by using two steel cannonballs and ten rubium splinters at an anvil , requiring level 35 Smithing and granting 15 experience.
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