Duncan is the muscle for the boss, serving as her loyal bodyguard and one zombie demolition team. As a zombie brute he is not the smartest, but he does go absolutely crazy for Zombie Snacks. The boss makes it herself using fresh pieced of brain in her 5 tray food dehydrator, providing a healthy and nutritious treat for growing zombies.
Each mastery level adds another card to the cardpool for defeating Duncan. 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.