Add a new rule, “Beasts”:-

Various Beasts stalk the land, and are described in subrules of this rule. Each Beast has a Motive and a Behaviour. As a daily action, the Baron may select a Beast at random: if its Motive is not currently met, the Baron must apply the effects of its Behaviour, once.

Add a new subrule to “Beasts” called “Dragon”:-

The Dragon’s Motive is to amass a Hoard of 1000 Gold. The Dragon’s Hoard is tracked in this sentence, and is currently 500 Gold.

The Dragon’s Behaviour is to select a Knight at random from those which are not Wielding a Weapon or Shield (if any such Knights exist), and to remove half of that Knight’s Gold (rounding down). The removed Gold is then added to the Dragon’s Hoard by the Baron.