I am playing a homebrew campaign and it will utilize three compendiums. I found that in order to use the maps I have to run one campaign then start a whole new campaign. I think it would be nice if I could either transfer maps from one campaign into another or add a compendium to a campaign that has already started. for example we ran Horde of the Dragon Queen, then instead of just adding Rise of Tiamat I find I need to start a whole new game. What sucks is since this is part homebrew, there are custom maps made that can't be transferred.