Justice has spoken, and the evidentiary trial is to be abolished. Actions are now to be judged by her divine authority directly, and the King of Wessex has agreed. She has empowered her priests with the ability to demand a Trial by Ordeal of suspects, in which the power of Justice itself will determine their guilt or innocence...
A trial by ordeal is a rite, which takes a few minutes to perform. It generally involves holding a red-hot iron, but a sharp sword may be substituted, or various other such formats devised when circumstances demand. The key point is that the supplicant is set a task believed to be sufficiently difficult that only through the power of Justice could they possibly be successful and declared Innocent. Justice is known to Disapprove greatly of repeated attempts to try a person for substantially the same offense.
OC, this is physrepped using a bead bag. The priest declares their intent to perform a trial by ordeal, naming the victim and the charge, and optionally biases the result if they see fit. The ref brings up the bag, and may bias it further if they are OC aware of the truth/falsehood of the allegation. Then the subject of the trial deploys any relevant abilities, and draws a bead, which they keep secret between themselves and the ref.
While these OC preparations are being made, the priest should conduct IC preparations - honing the blade/heating the irons, preparing the charge and evidence, whatever they feel is appropriate. When the OC steps are complete, the supplicant does the ordeal, a process involving a few minutes of RP, and at the end they are successful or have failed. This answer is provided by the supplicant and watched by the ref, and they cannot lie about it.
Features I want this system to possess:
1. Playing a priest of Justice should allow you to attempt to ensure justice is done. So they need some sort of skill to adjust the outcome of the trial, possibly to an extent depending on their level.
2. Characters who are lucky, blessed, or whatever should be able to survive trials better. Similarly, characters who are cursed or otherwise unlucky should be less likely to survive.
3. The system should never be certain: no matter how innocent or guilty a given character is, they should always have a small chance of being found the opposite.
4. But as a contrast to this, the refs should have the ability to affect the outcome of the trial, so that the result has some relation to the actual OC truth of the matter.
5. Because this trial system involves more OC mechanics than some others, there needs to be roleplay involved to cover the OC admin time - this is what the priest making their IC preparations is for, hopefully.
6. Trials should be of a roughly known length, and ideally involve some fun roleplay. The optimal arrangement for many larp trials currently is "the accused is unconscious on the floor while people have a long argument over their body", which basically just seems a bit terrible.
The bead bag contains three colours of bead. Ten white, no red, ten black.
The priest of Justice presiding over the trial may add red beads up to their level as a priest (say on a ranking from 1 to 8), and select if they count as white (innocent) or black (guilty)
The refs may remove beads from a single colour down to one.
If the character in question is lucky, they add white beads to the bag based on their luck. If htey are unlucky, black beads are added based on their unluck. Note that this happens after ref pruning.
The bead is drawn and that response is considered authoritative and canonical.
Strictly speaking, this only determines innocence or guilt. The matter of punishment is still untouched. However, I envision this going with a setup that uses punishments like fining, maiming, or execution, and avoids long-term imprisonment or the like.
One key feature is that someone who has been found Innocent is indeed Innocent. Justice has decreed that their actions were permitted and righteous. No rerolls.
This draft system currently satisfies all six conditions. I'm sure it's not ideal, but I think it's a decent start.