Hi Viekoda! Short answer: Can't be done (simply). Modules can only be used to create games. You could, as a Pro user Transmogrify the contents of one into the other, but that leads us to the: Long Answer: Yes, it will raise issues and will be difficult to run. DotMM is already one of the largest modules available on Roll20, and the same with DragonHeist. In fact, DragonHeist was so large that the team made the decision to split the four different high tier paths into separate add-ons. Too many characters (many with a good number of spells), graphics, tokens and maps will almost certainly lead to a game that is slow to load and laggy in performance. It may also be more prone to data corruption, and more difficult to copy or backup. A more workable solution is to create one game for each. If you really need one asset from another, you can either Transmogrify that page in, or Transmogrify the PCs over and switch games.