While damage can be done to them with a regular weapon at 75 Slayer, the thrownhammer must be used on gargoyles to finish them off when they have 10 hitpoints or less left, unless the player has unlocked the Gargoyle smasher ability via spending 120 slayer reward points, which allows players to automatically use the thrownhammer to finish off the gargoyle. Players can buy a rock thrownhammer from any Slayer Master for 200 coins each.