In the Margraviate of Sorao ruled by a Totalitarian, 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 Baleful Polymorph. The prisoner permanently changes into a small animal. One of my favourite D&D modules is Castle Amber. Wouldn’t it be a neat twist for the central garden to be the prison of several banished beings changed into the form of small animals? If the subjects fail their second saving throw, they even gain animal intelligence, in effect becoming just another creature in the garden.

Margraviate - A borderland ruled by the margrave who has military responsibilities. Usually larger than normal counties due occassional expansions at the borders.
Totalitarian - Totalitarianism (or totalitarian rule) is a concept used to describe political systems where a state regulates nearly every aspect of public and private life. Totalitarian regimes or movements maintain themselves in political power by means of an official all-embracing ideology and propaganda disseminated through the state-controlled mass media, a single party that controls the state, personality cults, central state-controlled economy, regulation and restriction of free discussion and criticism, the use of mass surveillance, and widespread use of terror tactics.
Trial by combat - Fight to the death, winner is innocent