This is going to explain how I use my go-to engine: CRGE-Kai.
Really, it’s just CRGE, but with Mythic and Ursa Minor attached, but I feel as though I should bring up how the process of how this works in this post so we’re all on the same page.
So, the game begins with the three factors set up: Chaos, Surge, and Turmoil. Chaos is Mythic’s Factor where it changes depending on how in control things are. Surge is CRGE’s Factor where it tracks how many vanilla Yes/No questions are asked, so as to swing the next question asked to a spicier result. And Turmoil is Ursa Minor’s Factor where it tracks uncertainty.
To give an example, the game starts at a Chaos Factor of 5, a Surge Factor of 0, and a Turmoil Factor of 2. The scene ends with the hero attracting a lot of unwanted attention from villagers and townsguard, but otherwise had the situation under control. There were also quite a lot of Yes/No answers that were vanilla, and, as a result, the Chaos Factor goes down to 4, Surge Factor goes up to 3 (as there were three vanilla yesses in a row), and the Turmoil Factor goes up to 4.
For the most part, CRGE answers the questions. When a double is rolled, either naturally or if with modifiers added, it triggers a random event, which Mythic handles. Modifiers are basically either the Surge Factor and the “odds”, which are modifiers of increments of 5 depending on how high those odds are. For example, “Has To Be” and “Impossible” are a 25 and a -25 respectively, while “Likely” and “Unlikely” are 10 and -10.
Ursa Minor activates when I either need to use something that makes long processes that require multiple rolls (i.e. combat or travel) into one single roll or when I roll an altered scene. Usually I don’t have a good idea for altered scenes, so I instead see if it triggers an incident from Ursa Minor, to which I use the incident rolls.
And… That’s roughly it. It’s simple, but at first glance, it’s understandably complex.