Holy Marshal Law states that when this law is invoked over an area, no more than three people can gather in the streets in one place. Kids must stay inside their homes, as should other people unless it's an emergency.
Under this law, the ruling authority has all the right to arrest any man as long as there is even the slightest suspicion. It allows the church's authorities to supersede the authority of the nobles of the land—be it a baron or a king.
The law can only be invoked by the Inquisitor High Lord, Saint Wazir, Saint Sceptre or the Pope. If a strong enough wizard is available, they may also deploy a wide area surveillance rune that shall tell the caster whenever someone dares escape the designated blocked area.