The Children of the Lord of Black Pleasures were once a cult to be feared. Nothing was too depraved, no torture to extreme. They might come back once more.
Assassins are always there to be had, for a price. Sometimes, those wishing to hire assassins for very little find their way to the Thrillkill Society.
Many noble lords offend people of equal or greater rank as themselves. In the kingdom of Aoh Chiane, these offenses are dealt with in duels. But, of course, the nobility of Aoh Chiane do not fight their own fights…
A Cloak of Shadows that causes mushrooms to grow in its own shadow. A crouching theif might find himself in a ring of poisonous toadstools, an interesting thing for a sentry to find after the thief has left hiding place.