The cycle is some sort of periodic repetition wherein 22 people are found dead. These people represent characters from tarot cards. It is unknown what would happen if the cycle ever gets completed. It is suggested that the fall of Atlantis came about due to the completion of the cycle.
There is an order of the Awakened who have for centuries been dedicated to preventing the cycle from completing.
The party has found a gateway to the twilight world known as Abandon through the Chalice. In Abandon they found a circle of sarcophagi where the dead victims of the cycle appear with their tarot card numbers burnt into their naked chest. In the center of the circle of sarcophagi is a shadow sundial which points to the next date when someone will die as part of the cycle.