It seems there are four endings that come with The Dragon: the campaign against the Draconic Lords, as well as Dragon Slayers, Domain of Dragons, and Dragon King. Consider that the Dragon Realm requires dragon scales to be placed on Draconic Lord cards to calculate the difficulty of its spaces, and the Dragon Tower requires a Dragon King to determine the deck for encounters.
My question relates to how different endings are compatible with the two sides of the board.
The Draconic Lord campaign, of course, is compatible with both sides as it uses dragon scales (cycled as the Dragon King changes) and always has a Dragon King.
Dragon Slayers uses dragon scales (as life counters), but does not have a Dragon King. This ending seems compatible with the Dragon Realm, but not the Dragon Tower.
Dragon King and all other alternative endings have neither a Dragon King (referring to a Draconic Lord King) nor use dragon scales. These endings seem incompatible with both the Dragon Tower and the Dragon Realm.
So, this is how we play it. Before each Talisman game, we decide if we want to play the Draconic Lord campaign, and if so, we use either side of the overlay. If not, we include the three alternative endings among the rest. If Dragon Slayers is drawn, we use the Dragon Realm. If Domain of Dragons is drawn, we use the Dragon Tower. If any other ending is drawn, we don't use the Inner Region overlay.
Does this sound correct? Is there an oversight somewhere? I should say that we would like to use this approach, as we have always avoided the Inner Region board with any ending except the Draconic Lord campaign, but we are wondering if this would be correct.