in the Propraetor rules it is said that "If there are no area cards on the corresponding slot, this part of action cannot be done." But after using Propraetor action, the used card is replaced immideately. How can it be empty?
in the rules for the ending of the game : "The game can end in two ways: 1. During action phase (A) at least one area card cannot be refilled. In this case, play the action phase as normal, but particular parts of action locations and patron cards that would normally use the area card in the now empty space do not work (gaining and buying of resources from area cards). In addition, you must pay 2 denarius in the empty card slots at the end of your action (see page 6, moving the area cards). If you cannot pay the price, you cannot use the action location" it's only possible at the end of the game