"Your Grace, I must warn you... This is no ordinary golem. He's made of adamantine. He's almost impossible to

"Your Grace, I must warn you... This is no ordinary golem. He's made of adamantine. He's almost impossible to destroy, even with magical weapons. But if you wear it out for long enough in battle, it will collapse for a while to restore its strength. At that moment, you'll need to pull the key from its chest. If I know anything about mechanics, that should switch it off!"