Thomas Shey
Legend
I said right in my post, not even considering the use of Possibilities!
Sorry, I missed it.
Anyhow, since there's a bit of interest, here we go (with use of Possibilities)...this is compiled by me from the core rules and a sourcebook that adds a Disfavored mechanic (the actual rules text already has a fair amount of errata). I'll leave out individual spells and such that have their own complications to add, of course (a nontrivial amount!).
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- Roll a d20. This is your die roll total (a term not used in the books, but I use it for sanity).
- If the test is Favored, and your die roll isn't a Mishap (not gonna drill into that), you may reroll, but then you have to keep the new initial d20 roll.
- If instead the test is Disfavored, the first extra d20 roll that would be added to the total is ignored. This includes steps 4 & 5 immediately below, as well as conditions like Up (not gonna drill into that), or the first use of a Possibility (step 6).
- If the test is for a raw attribute, or a skill in which you have adds, and the roll was a 10 or a 20, roll the d20 again and add the result to the total. Repeat this step until you don't roll a 10 or 20. (Note that the standard Torg Eternity phrasing for making skill tests is "skill or attribute", which makes it look like you can roll a raw attribute, but no, it's really a skill roll but they're trying to be nice by naming the base attribute.)
- If the test is for a skill in which you don't have adds, and the roll was a 10, roll the d20, add the result to the total. Repeat this step until you don't roll a 10.
- If you spend a Possibility, you get to roll another d20 and add it to the die roll total, with ongoing roll-agains on 10s and 20s as in steps 4 & 5 (although the rules are unclear on whether the "no skill adds" proviso applies). If that added d20 roll is below 10, however, treat the roll as a 10, but without any roll-agains. (Characters have their own personal Possibilities, and players can play cards titled Hero or Drama to add a Possibility to a test as well. They may only add 1 Possibility from each such source.)
- Look up your die roll total on the Bonus Chart (below, except "Die Roll" should be "Die Roll Total"; some rules are about individual rolls of the d20 and some are about the accumulating total). This is the number you add to your skill or attribute value to get your test total. Note that the "Bonus" here is distinct from bonuses due to spell effects and other situational modifiers. Note that you add all other bonuses to the big-B Bonus, not to the die roll total.
And in combat, if you hit your target, there is further multi-step math to figure out how much of the two different damage types you do.
Simple! Easy peasy! I sure hope I didn't get anything wrong in all that....
I'm assuming some of this must be the most recent version because that whole Favored/Disfavored thing doesn't sound familiar (and to me, and yes I'm being sharp about "sticks of Advantage/Disadvantate").