Active or Open Games
Dicey Nobilis does not change the standard Nobilis rules - one may still spend MP following all the normal rules. Dicey Nobilis simply adds the choice for the Nobilis to take risk in two scenarios: Miracle Levels, and Penetration - delineated by different rows.
When choosing to be Dicey, one risks their Miracle points - one may not choose to spend some for a sure thing and risk the rest. For each Miracle Point spent, a player places a token on one of the boxes on the table above. Each must be put in a different box, giving an upper limit of 10 MP spent (5 for Miracles, 5 for Penetration).
Then a 12 sided die is rolled and compared against the table. Rewards are given in the first row. Rolls on the second row (Penetration) give the reward if the die is within that range. Rolls on the third row (Miracle Level) give the reward if the value shown on the die is divisible by the number in question. Every single box will win on a 12. Only the 'all' box will possibly 'win' on a 1, or a 5, but that's the equivalent of spending the same.
On average, players will get back one MP for each MP gambled - it is a completely balanced scenario, on a long enough timescale. Yes, this is a very simplified form of roulette, inspired by the mechanics of Fastlane which in turn were inspired by Nobilis, thus making the cycle complete.
When gambling Penetration, things are simple - the winnings are all applied to penetration.
When gambling Miracles, the distinction between Miracle types become irrelevant - there is no differentiation between Simple, Normal, Hard, Deep - there are no Words of Command. You only need to spend the difference between the Miracle Level and the Attribute. This is the good part - if the points go in the Noble's favor. However, if the final number of Miracle Points are insufficient to complete the Miracle, the Noble's effort is merely wasted (although if the Noble is doing several Miracles inclusive of one another, the lower-level Miracles that the Noble's efforts have reached still occur).
If the Noble achieves four more Miracle Points than necessary to complete their Miracle, they have overreached themselves. Immediately, these Miracle Points are lost as they take a wound level, and their Miracle is upgraded to a Major (if Minor), or an Imperial (if Major) Miracle of the same type (and yes, a Minor Miracle with 8 extra Miracle Points would lead to two upgrades of this sort, and two wounds taken), with ramifications up to the Hollyhock God. Otherwise, extra Miracle Points may be returned to the appropriate MP pool or spent on Penetration if it is being gambled as well.
Since this is effectively a break-even game over time, other mechanics for MP refreshing will not change.
The d12 was chosen for a few reasons: