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The weapon may be primitive, but it's effective. Good old gravity is a gargoyle's best friend and worst enemy. It's an enemy because at the beginning, you have to spend all your energy to lift it as high as possible, but then, when you're out of energy, the enemy turns into a friend. A gargoyle with a plate like that can achieve such a high 'g' force, it's something even astronauts wouldn't dream of. :)