If I buy Lost Mines of Phandelver, is the token and art assets only usable within the module? Or can I use it in other modules if said module does not have a token or piece of art I want to pull from a module I purchased? Wondering because I read that Lost Mines can be merged with The Essentials Kit to make the Essentials Kit even cooler but I'm not sure how that would work if you can't combine the two art assets // modules. Thanks!