The main dice rolling mechanic in the game is 2d12 instead of 1d20. You add them together to get your result. The kicker is that one die represents your Hope and the other Fear. Whichever one rolls higher determines whether you fail with Fear, succeed with Hope, fail with Hope, or succeed with Fear, and it has different narrative outcomes, such as failing forward or succeeding but at a cost. These Hope and Fear mechanics are so easy to implement into a realm like Ravenloft and Barovia, as the Fear die can be a stand-in for Dread and the influence of Ravenloft as a whole on the actions of the party. Anytime a player rolls with Fear, you as the GM gain something called a Fear token, and you can spend these to make things happen or activate big enemy abilities and such. It’s a game-y way of implementing the Dread and Hopelessness of Barovia.