The base Chachapoya game is expanded by new haunting and dangerous KUM HAU Demon cards. We should shuffle the Demon promo cards into the treasure deck, after it prepare the other card as it's written in the game rules.
The first player to get the Demon card becomes possessed and they have to turn the highest valued card face down. The next player getting possessed will take all collected Demon cards from the player who has them and puts them in front. The number of Kum Hau cards they have they turn the same amount face down.
The player getting freed from the Demon can turn their cards over!
The game ends for the player who have collected all Demon cards immediately. They have to fold all the other cards and will not participate in the rest of the game. That player gets possessed terminally and all in all gets 25 points.
The other players continue playing the game following the normal rules.
Enjoy playing the game and fear from the Demons!
-description from designer