In the Grand Duchy of Oni ruled by a Magocracy, a character must undergo a Trial by combat.
He has been framed by A cult or brotherhood - bound by a mission and code - and if found guilty of Spying, his punishment will be Insanity. The imprisoned can only act normally 25% of the time, and their state of mind changes every six seconds with equal chances of babbling incoherently, hurting themselves or attacking someone else. Being imprisoned in your own skull is a harsh sentence.

Grand Duchy - The dominion of the grand duke, who is higher ranking than the duke, but beneath the archduke. Usually a member of the royal family in line of succession.
Magocracy - Magicians who were credited with great power often became chiefs and kings in early societies. A magocracy is a form of government in which society is ruled by such magi, wizards, or witches. The term is used in the Dungeons & Dragons role-playing game and other works, by analogy with aristocracy, meritocracy, and theocracy.
Trial by combat - Fight to the death, winner is innocent