I'm planning on starting a new campaign soon so I'm considering buying my first module(s) on Roll20. However, I'm wondering if I should only be looking at modules for the system I plan to run or can I look at others and then just change the character sheet to match the desired system? For example, I already own a copy of Wrath of the Righteous (a Pathfinder module). If I buy it in Roll20, it would save me A LOT of time (obviously). But, I'm planning to run a D&D 5e game. I'm fine with adjusting the monsters, etc. I'm mostly interested in the maps and other stuff that isn't generally system-specific. Related question: Can I change a campaign after-the-fact? In the above example, I've already started that campaign from scratch but could I change to Wrath now that it's begun or would I have to make a new campaign to gain the benefits? Finally, is it possible to use multiple modules in the same Roll20 campaign? I usually splash in a few (in part or in full) into a campaign.