Their natures, methods and powers are not known; only the outcomes of what they decide. Each darklord is subject to a few similar conditions, but all have unique and special torments that haunt them.
Why yes I can. Might be a few fanon things in there, but they should be marked. A few examples to get you going:Can you give me a list of known canon Dark Lords across Ravenloft, there domains and "punishments"?
• Count Strahd von Zarovich, the vampire lord of Barovia. His curse is to constantly encounter reincarnations of his beloved, and lose her every time.
• Azalin Rex, lich lord of Darkon. His punishment is the inability to learn new magic.
• Dominic D'Honaire, darklord of Dementlieu. He is cursed to repulse and disgust women in proportion to his attraction to them.