In the Archduchy of Quasedad ruled by a Coalition, a character must undergo a Trial by combat.
He has been framed by A magic item - sword, relic, wondrous item - and if found guilty of Embezzlement, his punishment will be Trap the Soul. Put the prisoner into a gem. Break the gem when the sentence finishes. Note the gem must have a value based on how powerful the prisoner is, but the type and shape of the gem remains up to you. Perhaps those glowing red gems in the horned demon statue’s eyes have more than just good market value….

Archduchy - The dominion of the archduke, who is higher ranking than the grand duke, but still beneath the king. Usually a member of the royal family in line of succession.
Coalition - A coalition government, in a parliamentary system, is a government composed of a coalition of parties. A coalition of parties is also an electoral fusion. The union of different political parties or groups for a particular purpose, usually for a limited time.
Trial by combat - Fight to the death, winner is innocent