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@Ruse Yes, I think you get the idea! To your second comment, no, there will not always be 2 factors. At least, it isn't guaranteed at this point! (This is still very early on.) The order in which to apply factors will be set, so there is no question if one comes before another.
Wow, a lot of comments! @axoren, the poker hands give you a nice non-linear scale, and some hands really require teamwork to achieve. It's also memorable and gives every one a chance to contribute to some outcome.
@korvinstarmast I understand an "edition" to incorporate some set of rules which are intended to work together and are published by [legal entity who holds copyright over Dungeons & Dragons at that time]. So a book with new races, classes, and mechanics does not constitute a new edition when intended for use with existing material. A book which overhauls rules from 3rd party would not be a new edition. A book from WOTC (the current copyright holder) which does not reference other books would be a new edition.
Not worth a full answer, but a good addition is a "session 0" which includes "hey players, you evil characters need to have motivation to save the world." It's similar to an ultimatum I give evil characters in general (which is "work with the party or become an NPC")