This mini-expansion for Rebis is part of the "Achievements" series of Matchbox Collection mini-expansions, and as such should only be opened and used once the 3 criteria on its envelope have been met; because of this... SPOILER ALERT: This expansion adds a new set of 9 Golden Book cards (numbered 1 to 9), as well as a Homunculus token, to the base game of Rebis; these new Golden Book cards can be drafted to players' shelves during gameplay, and when they are placed, they also increase the multiplier of that shelf by placing the Homunculus token on the 2x multiplier space, permanently pushing any existing mixture tokens to the right.