>>96150287
Really the crux of it all is having a supported game system at all. Whether or not you cast crusader strike, pyroblast or moon beam during the vanilla, wc3, wc1 or Battle for Azeroth timeline is irrelevant. Its the same spell. If anything, if i wanted to make a buck i would sell a generic players guide, a generic DM guide and then cash in extra by selling them "classic era setting book", "burning crusade era setting book", "Mists of Pandaria Setting Book" and so on. With this you can sell way more products and give each expanion book some optional flavour rules like enviromental dangers for Wrath or some Apexis bullshit for WoD or some class order hall system for the Legion book.