Worried about the diminishing size of her coven and monster minions, Ivana has been trying to get more visitors to the island to transform them. The dark alchemist promised her a steady flow of visitors from Little Town once he takes over. In return, she is to provide an army of zombie brutes to the alchemist, as well as her coveted recipe for zombie snacks.
Each mastery level adds another card to the cardpool for defeating Ivana. Each of the bronze, silver, and gold mastery levels unlocks a new card, while it takes all three diamond and onyx levels to unlock a single card.